rear axle ratio RPO - Page 2 - S-10 Forum
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post #51 of 419 Old 08-10-2003, 07:37 PM
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I have a code GQ1 and then GU6 in my 86 auto extended cab. What does that mean....is it a 3.42 or a 3.73?

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post #52 of 419 Old 08-13-2003, 11:45 PM
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m=y truck came with a 2.5 and a 5 speed tranny dont have glove box codes it most likley has a 3.73?????????
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post #53 of 419 Old 08-17-2003, 12:41 AM
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Quote:
Originally posted by 3rdCoastCrawlin
Ok, my RPO code says that I have a 3.08Ratio (GU4) , but I can smoke both tires, and this is straight from the factory, so does this mean I have a limited slip. I have a 99 Extended Cab LS with the 4.3
no it does not always mean you have limited slip. Be warned when rear ends are going out both tires will begin to spin most people like this but dont know that their spider gears in the pumkin are binding up causeing a great deal of strain.

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post #54 of 419 Old 08-23-2003, 09:28 PM
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89' 4x4 S-blazer 5.7l tbi 700r4

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post #55 of 419 Old 08-23-2003, 09:34 PM
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on my 89' s10 blazer 4.3l 4x4. in the glove box on the second row of codes the last 3 sets of codes read:
GQ1 GU6 G80
So Im asuming Its the GU6(3.42) and a locker(G80). So what does GQ1 stand for cause It can't stand for a ratio cause you cant have 2. Is one of them the t-case ratio?
The reason I think the GU6 is a ratio code is cause every almost everyone ahs stated they have something other than GQ1 as there ratio(i'm not saying they don't have that code just that they probly found one of the axle codes on the first list ) the other codes follow sequence GU2,GU4,GU6...GT4,GT5... AND ONLY ONE GQ, the GQ1. so I think its another drive train option that someone has mistaken for a ratio code. question is what does it stand for? if it wasn't saturday night id call the dealer.

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post #56 of 419 Old 08-23-2003, 10:24 PM
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Looked around with google GQ1=standard axle ratio(came standard on the vehicle)
http://www.polariswebdesign.com/GMRPOCodes.pdf

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post #57 of 419 Old 08-23-2003, 10:28 PM
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Quote:
Originally posted by 3rdCoastCrawlin
Ok, my RPO code says that I have a 3.08Ratio (GU4) , but I can smoke both tires, and this is straight from the factory, so does this mean I have a limited slip. I have a 99 Extended Cab LS with the 4.3
If the rpo code after,to the right of GU4 is G80 then you have a locker.


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post #58 of 419 Old 09-04-2003, 08:51 PM
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i have a 88 2.5 5speed reg cab with a gt4 3.73 .im fixing to do my v8 con will the 3.7 10 bolt hold up to 450 hp with a turbo 350 tranny
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post #59 of 419 Old 09-06-2003, 12:52 AM
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ok ya'll. none of ya'lls trucks have a locker, unless under any given condition, both rear tires spin. limited slip is a term when power is transfered to the wheel with less traction. if each tire has equal traction(or somewhere close) then both tires will transfer power. a true locker locks both rear tires under all conditions. ask any educated person in the offroad world, and they will back me up on this. they are the ones who know everything about lockers. they are the ones who basically came up with the idea of a locker. a locker does exactly what it says, locks the tires together. and there are different kinds of lockers, full time lockers, air lockers, or gearless lockers. some trucks come with gearless lockers(which are crap).

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post #60 of 419 Old 09-09-2003, 08:04 AM
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4bangn, the 7.5" ring rearend you have will eventually break with 450hp v8. especially if you get on it alot. they put it in f-bodies, but it's only made to take about 300hp or so.

try to find one out of a zr2. those are 8.5 ring. not sure of the ratio, but it will bolt up. otherwise, you can put anything you want in there with enough work and/or $$'s.

sign_in_name, you are basically correct, except that limited slip transfers power to the wheel with the MOST traction, not the least. if it was otherwise, the tire with no traction would just spin 'till it gives up the ghost, and you would be stuck in that mudhole. i'm sure you knew that, and just wrote it backwards, but for those others reading, it's power to traction, not power to slippage. the best advantage of a limited slip over a full time locker is cornering. when you take a corner, the outer wheel takes more revolutions to get around the bend. you really don't need positraction (limited slip) for regular street driving, unless you tend to have a heavy foot, and spin one wheel, or you just like the look of a true burnout. one wheel burnouts dont count.

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post #61 of 419 Old 09-15-2003, 11:16 PM
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i got a form from gm that states that i have the limited slip rear-end which makes sence considering that my truck had the towing pkg. and a 5 speed, but it says gt4 in the glove and i know its a limited slip cause when i go to the track and go straight its always 2 wheels, can somebody explain cause my story has been contricted somewhere above... ???????
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post #62 of 419 Old 09-24-2003, 01:49 AM
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Quote:
Originally posted by sign_in_name51
ok ya'll. none of ya'lls trucks have a locker, unless under any given condition, both rear tires spin. limited slip is a term when power is transfered to the wheel with less traction. if each tire has equal traction(or somewhere close) then both tires will transfer power. a true locker locks both rear tires under all conditions. ask any educated person in the offroad world, and they will back me up on this. they are the ones who know everything about lockers. they are the ones who basically came up with the idea of a locker. a locker does exactly what it says, locks the tires together. and there are different kinds of lockers, full time lockers, air lockers, or gearless lockers. some trucks come with gearless lockers(which are crap).
ok chill out! I haven't taken apart my rear end yet but it is a g80. and you can get lockers on chevy trucks whether or not there as good as a detroit locker is one thing. for one thing it is listed as a locker by gm, than more than likly it is. other wise don't you think they would just call it a lsd then? another thing i was reading a service bulleton on my truck and one of them was for delayed rear LOCKER engagment( rpo code g80) it states that this is caused by the use of lsd additive in the LOCKER. to fix it you drain the fluid and fill with 80w-90 gear oil. it also states not to use lsd additives because the g80(LOCKING rear diff.) is a LOCKER and NOT a Limited Slip Differential(lsd)

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post #63 of 419 Old 10-01-2003, 08:48 PM
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so what size is the ring gear? 7.5 or 8.5?

I sure hope I got the correct diff... Got a Zexel unit waiting to be put in, just looking for a diff cover and the greese to get the pattern.

Is the inside diameter of the ring gear the same on a 7.5 and a 8.5 diff?

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post #64 of 419 Old 10-06-2003, 04:39 PM
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I am lucky enough to be blessed with the covetted 3.08. lol. My 99 x is a 4.3 auto with the 3.08. But im kinda happy with that, just means i can get more acceleration by throwing a different rear gearing on there because i can only go up.


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post #65 of 419 Old 10-31-2003, 02:29 PM
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What is the usual ratio for a 96 4.3L 5 spd. manual. 2WD LS package S-10.....my sticker in the glovebox is gone and I need to know, Thanks.
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post #66 of 419 Old 11-12-2003, 07:00 PM
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my 91 4x4 is a gu6 3.42 it pulls alright 0-60 times are slow though low nine high 10 times.

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post #67 of 419 Old 12-15-2003, 08:56 PM
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Quote:
Originally posted by Beasthead2
Me and the OEM's consider the g80 gov-lock a locker. The industry may sometimes use the term "limited slip" when selling you a car, to mean any kind of traction device in general. Be it a locker, limited slip, or computer traction control. The true term evolved to mean non locking differentials, with friction plates to "limit" slip instead of prevent slip. A limited slip gives alot of resistance to differential action at all speeds and at all times, and never locks.
This leaves the definition of locker to mean a device that completely locks the diff at some time. The g80 gov lock locks completely 100% when it does lock. The only reason an aftermarket locker is different is because they lock with any slight difference in torque between the wheels, while the gov-lock locks due to a significant difference in wheel speed between the two wheels. So the gov lock will spin some before it locks. I think the gov lock is supposed to give a little resistance before it locks with friction plates, but not nearly as much as a limited slip. Mine has worn down to where it has no resistance at all until it locks completely.

Call it "inferior","not a locker", "a posi", call it whatever you want'; but it is simply bad English to call this, strictly, a "limited slip"


Unless you're saying "limited slip" to include all lockers because it is true that something that completely prevents slip also limits it. But thats like saying a full glass is also 1/2 full because it has 1/2 full plus the other 2nd half.
Thats why in our neck of the woods we refer to the Gov-Loc as a "Spin locker".
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post #68 of 419 Old 12-18-2003, 12:45 AM
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i was in all data the other day and found out the g80 is made by eaton.

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post #69 of 419 Old 12-27-2003, 06:05 PM
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How come i have a 1996 Chevy S10 with the 2.2L and i have limited slip?

I have tested it...in snow, the power shifts between wheels on the rear axle. I had my brother nail it at a stand still on ice, and the power shifted from left, to right, to left, to right, till it grabbed

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post #70 of 419 Old 01-20-2004, 11:57 AM
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Re: rear axle ratio RPO

Ok, I have a 90 and I looked in my glove box and found nothing there????? Am I just not lookin inthe right place in it or waht??? Where exactly are the codes located?

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post #71 of 419 Old 02-06-2004, 03:01 PM
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Re: rear axle ratio RPO

v6 auto normal tranny = 3.42
v6 5 speed = 3.08
v4 5 speed = 4.10
v4 auto = 4.10

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post #72 of 419 Old 03-08-2004, 10:23 PM
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Re: rear axle ratio RPO

What if I dont have my glove box any more? How can I tell? Also the list only has LS models, what about base, base models?

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post #73 of 419 Old 03-08-2004, 10:36 PM
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Re: rear axle ratio RPO

This G80 locker/posi/limited slip stuff has been gone over 5 billion times. it is neither a locker nor a limited slip, it is a POS...no really it isnt either one, its a hybrid of both. it contains clutches and springs like a limited slip, but it also has a cam mechanism, that when the clutches engage, that cam "lobe" slides over and locks up those clutch plates so its fully locked up, like a locker.

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post #74 of 419 Old 03-08-2004, 10:39 PM
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Re: rear axle ratio RPO

Quote:
Originally Posted by Cupdeez
v4 5 speed = 4.10
v4 auto = 4.10
lmmfao, sorry guys, i just find that funny as shit.

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post #75 of 419 Old 03-12-2004, 07:21 AM
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Re: rear axle ratio RPO

How Bout Gq1 And Thats The Only Code In My Glove Box, It Was An 2.8 With A 4 Speed Manual Trans, I Counted Teeth Once And They Seemed To Come Out To A 3.42 But I Could Have Been Wrong

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post #76 of 419 Old 03-12-2004, 09:04 AM
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Re: rear axle ratio RPO

[QUOTE=meangreen9c1]Don't all 2.2s come with the 4.10s?[/QUOTE EXCEPT REG CAB 5SPD. THEY HAVE 3.73
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post #77 of 419 Old 03-12-2004, 01:33 PM
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Re: rear axle ratio RPO

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Quote: Originally Posted by Cupdeez

v4 5 speed = 4.10
v4 auto = 4.10

lmmfao, sorry guys, i just find that funny as shit.

Find it funny here is the GMC spec

AXLE RR
Rear axle, 3.42 ratio, (TS10603 Regular Cab, short box, TS10803 Regular Cab, long box and TS10653 Extended Cab) (GU6) $0.00
Rear axle, 3.08 ratio, (TS10603 Regular Cab, short box) (GU4) $0.00
Rear axle, 4.10 ratio, (TS10603 Regular Cab, short box) (GT5) $0.00


all 2.2 L that I have owned had a 4.10 ratio this does not mean they didn't make something else.. maybe 10 years ago when you got your truck they used diff trany...

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post #78 of 419 Old 03-12-2004, 02:20 PM
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Re: rear axle ratio RPO

I think he was referring to the "V4" thing....

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post #79 of 419 Old 03-13-2004, 11:03 AM
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Re: rear axle ratio RPO

4 banger Sorry Mr. muddy

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post #80 of 419 Old 03-14-2004, 12:50 AM
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Re: rear axle ratio RPO

OK heres one, whats it mean if i got a GQ1 and GU2 ???
4.3 auto 88
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post #81 of 419 Old 03-16-2004, 05:58 PM
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1st Gen come stock with 8.5?

I have a 89 S10 with an 8.5 with 3.08 gears its got the GU4 code in the glove box. But did s10 even come with an 8.5. Ive only seen 7.5s in them. Would the prev owner put it in or is it stock? What kind of posi would it have?
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post #82 of 419 Old 03-21-2004, 08:38 PM
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Re: rear axle ratio RPO

where can i get a zexel torsen LSD?

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post #83 of 419 Old 03-21-2004, 08:39 PM
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Re: rear axle ratio RPO

where can i get a zexel torsen LSD?

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post #84 of 419 Old 03-26-2004, 04:52 PM
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Re: rear axle ratio RPO

i have an '83 2.8 v6 2d, 2wd w/ 4 speed auto...the code says gq1....and nothing else. i understand its the standard ratio, but ive seen about 3 diff. rations listed here.
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post #85 of 419 Old 04-09-2004, 02:17 PM
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Re: rear axle ratio RPO

i also have a '91 sanoma used for parts that has the codes GQ1 and GU2......its not a 4x4 so im guessing that means GU2 (2.73 ratio) was the standard (GQ1 reads as 'standard gear ratio' on that RPO code list posted earlier)

so if anyone could help me in figuring out the ratios of this and the one i posted earlier it would be greatly apreciated.
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post #86 of 419 Old 04-11-2004, 01:08 PM
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Re: rear axle ratio RPO

I want to run 18 or 20 inch wheels on my 03 ext cab 2.2. Now Im being told that I will lose horsepower because of thesize of the wheel swap, but that I can make it up by swapping the gears in the rear end. Now I know that I currently have the 4:10 now, can anyone help with what a better gear ratio would be to regain the lost horsepower?

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post #87 of 419 Old 04-25-2004, 10:40 PM
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Re: rear axle ratio RPO

heres one for you all.. my code is a gu2.. that mean i have something higher then a 3.08??

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post #88 of 419 Old 04-27-2004, 07:58 PM
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Re: rear axle ratio RPO

i didnt check my codes but my window sitcker said i have 3.08 gears. my differential is a full size though. it has 13 mm bolts instead of a 1/2

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post #89 of 419 Old 04-28-2004, 02:18 AM
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Re: rear axle ratio RPO

Quote:
Originally Posted by kys10x
i didnt check my codes but my window sitcker said i have 3.08 gears. my differential is a full size though. it has 13 mm bolts instead of a 1/2
how can you tell did you mic. it???
13mm and 1/2" are pretty damn close in size.

89' 4x4 S-blazer 5.7l tbi 700r4
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post #90 of 419 Old 04-29-2004, 10:16 PM
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Re: rear axle ratio RPO

Quote:
Originally Posted by 350*s-blazer
how can you tell did you mic. it???
13mm and 1/2" are pretty damn close in size.
i found out when i was installing my kp 6 link the holes on the differential bracket didnt line up. so i measured the bolt pattern and talked to gill at kp and he told me that it was a full size differential. he made me a new s10 bracket with the layout for a f/s. and i checked the sizes numerous times. i even had to buy new bolts because the ones that came with the kit wouldnt screw into my rear end the thread pattern was 8mm by1.25 (i think i remember right) and a regular s10 is a 5/16 bolt with a 1/2 head

2002, xtreme, ex cab, v6, 5 speed, indigo blue, shaved gate handle, molded rollpan, belltech spindles, bagged with 5/8's line 1/2 fills and a kp 6 link,

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post #91 of 419 Old 05-04-2004, 09:53 AM
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Re: rear axle ratio RPO

What the hell is a GU2?????

96 RCSB 2wd s-10 2.2 5-speed...... needs motor work....

98 Volkswagen Passat 1.8t 5-speed..... daily driver
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post #92 of 419 Old 05-04-2004, 11:25 AM
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Re: rear axle ratio RPO

Quote:
Originally Posted by LoW_1
What the hell is a GU2?????
dont know.. i asked the same question a while back too..

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post #93 of 419 Old 05-10-2004, 12:30 PM
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Re: rear axle ratio RPO

The GU's are the codes for what gear ratio your trucks rear end has in it. A good friend of mine works for GM and gave me the list that is below. You should be able to find one of these codes on a sticker located inside your glove box.
S-10 REAR END GEAR CODES

GU5=3.23
GU6=3.42
GT4=3.73
GT5=4.10
HC4=4.56
G80 - locking differential
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post #94 of 419 Old 05-10-2004, 04:46 PM
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Re: rear axle ratio RPO

Quote:
Originally Posted by drpd10
The GU's are the codes for what gear ratio your trucks rear end has in it. A good friend of mine works for GM and gave me the list that is below. You should be able to find one of these codes on a sticker located inside your glove box.
S-10 REAR END GEAR CODES

GU5=3.23
GU6=3.42
GT4=3.73
GT5=4.10
HC4=4.56
G80 - locking differential
my truck has none of these codes just the gu2 code..

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post #95 of 419 Old 05-11-2004, 09:05 AM
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Re: rear axle ratio RPO

Sorry i didn't missed the top part of the chart when posted the other one. Here is the top half.
S-10 Rear End Codes
GU1=2.41
GU2=2.73

GU3=2.93

GU4=3.08
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post #96 of 419 Old 05-11-2004, 05:05 PM
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Re: rear axle ratio RPO

84 S10 2.8L Ext. Cab 4x4 5spd manual. I have the GQ1, which is the "standard", but can anyone tell me for sure what the standard is?
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post #97 of 419 Old 05-12-2004, 10:38 AM
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Re: rear axle ratio RPO

GQ1 Open Differential Rear Axle refers to a non-posi traction rear end. If you look very close at the numbers on the sticker in your glove box you will also find a GU number.
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post #98 of 419 Old 05-12-2004, 09:07 PM
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Re: rear axle ratio RPO

Quote:
Originally Posted by drpd10
GQ1 Open Differential Rear Axle refers to a non-posi traction rear end. If you look very close at the numbers on the sticker in your glove box you will also find a GU number.
ive got the same code in my '83 2dr 2.8l 2wd and there is no other code. now i know on the newer ones there are a ton of codes, but theres only that one code for the rearend.
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post #99 of 419 Old 07-12-2004, 04:20 PM
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Re: rear axle ratio RPO

ive got an 87' Sonoma with the 2.5 and a 4-speed, my code is GQ1, and GU6, which means I have a 3.42, but what is the GQ1?

~RicK~
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post #100 of 419 Old 07-12-2004, 04:21 PM
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Re: rear axle ratio RPO

oops nevermind

~RicK~
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