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rear axle ratio RPO

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Old 07-12-2002, 05:29 PM   #1
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rear axle ratio RPO

GU4=3.08
GU5=3.23
GU6=3.42
GT4=3.73
GT5=4.10
HC4=4.56

G80 - locking differential


compare to the codes in your glove box to know which gear ratio you have
Old 09-28-2002, 12:44 AM   #2
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i found the sticker and it has a bunch of lil codes on it and it said G80 on one of them but i dont have a locking diff, i have limited slip....

Last edited by pyros46290; 09-28-2002 at 12:50 AM.
Old 09-28-2002, 01:02 AM   #3
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The G80 is a limited slip, everyone just calls it a locker because they don't know the diffrence
Old 09-28-2002, 01:41 AM   #4
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didnt some of the 1st gen blazer 4x4s come with electric lockers?
Old 09-30-2002, 01:15 AM   #5
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Mine says GQ1 :confused: I have been to a few places and nobody seems to know my gear ratio, So I guess I'm an odd ball. I may be looking at the wrong thing? :confused: but I doubt it. If anyone knows what I have let me know! It is a 1984 S-10 Sport.

Im thinking it may be 4:10 or something around there, because it turns VERY high RPMS and gets horrible Gas milage with the V8.
Old 10-09-2002, 12:18 AM   #6
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note to self: transfer case ratio is stamped onto a tag that is on the back of the transfer case (case ratio is 2.72) now i just need to know my axle ratios......
Old 10-15-2002, 07:38 PM   #7
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i have the g80 code... and I have a straight up locker. I had to take it out cause I fragged a few teeth off my pinion. But it is no doubt a locker and now a limited slip.

JJ
Old 10-16-2002, 04:37 AM   #8
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Quote:
Originally posted by Flamed 98
...because they don't know the diffrence
you're right, you dont know the difference.

Quote:
Differential, locking rear (not available with Vortec 2200 L4 engine)
http://www.chevrolet.com/s10/library...ex_chassis.htm
Old 10-19-2002, 07:35 AM   #9
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www.smokemup.com
Old 11-21-2002, 12:08 AM   #10
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i just checked my beater and its says GT5. that just doesn't make sense to me. a 4 banger with a 4:10 ratio? its a 95 2.2 5 speed. can anybody tell me about this?
Old 11-26-2002, 02:40 PM   #11
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that is correct. they need to use the low gear ratio to multiply the little amount of torque the 4cyl puts out. damn near every s10 with the 4cyl and auto tranny has 4.10 rear ratio.
Old 11-29-2002, 10:58 AM   #12
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Quote:
Originally posted by Alanky
Mine says GQ1 :confused: I have been to a few places and nobody seems to know my gear ratio, So I guess I'm an odd ball. I may be looking at the wrong thing? :confused: but I doubt it. If anyone knows what I have let me know! It is a 1984 S-10 Sport.

Im thinking it may be 4:10 or something around there, because it turns VERY high RPMS and gets horrible Gas milage with the V8.
G80 = LIMITED SLIP DIFF
2.73 = GU2
3.08 = GU4
3.42 = GU6
3.73 = GT4, GQ1
4.10 = GT5
Old 11-29-2002, 11:24 AM   #13
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i know there are treads about this but im a dumb ass

what do i need to do or should do to get better traction
i have 95 4.3tbi 5 speed GU4
Old 11-30-2002, 11:56 AM   #14
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OKAY THIS IS WAT IS SAW INMY GLOVE BOX BY THE RPO CODE......THERE IS NO G80 IN THERE FOR THE POSI REAR....BUT Y AROUND TURNS AND IN THE RAIN AND ON DIRT DO I MOST OF THE TIME GET 2 TIRES........AND WHERE IS THE WEB SITE OR PHNE # TO GET A LOCKER AND HOW MUCH......THANKS AGIAN GUYS
Old 12-16-2002, 07:05 AM   #15
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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.
Old 12-21-2002, 12:57 AM   #16
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which trucks usually come with 3.42 from the factory ????
Old 12-24-2002, 11:09 AM   #17
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I have a 94 4.3L TBI with a 2.73!!

GU2
Old 01-20-2003, 09:24 AM   #18
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What'dya get in first like 45mph lol
Old 01-21-2003, 08:19 PM   #19
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Black Dragon:

I just picked up a rear axle from a 87 GMC S15 4x4, the codes in the glove box were GU6 and G80. I understand this means 3:42's Posi. I believe this is a factory option in most of these trucks. I just got this from the scrapyard. Hope this helps
Dave
Old 01-24-2003, 11:22 AM   #20
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i've got 3.42's with a torsen LSD.:guitar:
Old 01-24-2003, 07:03 PM   #21
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My Old 94SS and my 00 Xtreme both with V6 and Auto
came with 3:42.1 from the factory
Old 01-30-2003, 12:35 PM   #22
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Don't all 2.2s come with the 4.10s?
Old 02-06-2003, 02:32 AM   #23
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Quote:
Originally posted by MyXtreme2000
My Old 94SS and my 00 Xtreme both with V6 and Auto
came with 3:42.1 from the factory
I have a 2001 sonoma V6 with 3:42:1 with limited slip, It spins both tires on the pavement all the time, but a few times in the mud and snow only one tire was really spinning good
Old 02-06-2003, 11:48 AM   #24
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Quote:
Originally posted by meangreen9c1
Don't all 2.2s come with the 4.10s?
no, many come with 3.73s also.
Old 02-07-2003, 01:30 PM   #25
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The higher the ratio the better the gas mileage, correct?
Old 02-08-2003, 01:07 AM   #26
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taller gears (lower numbers) are better for gas mileage.

3.08 gets better mileage than 4.56
Old 02-09-2003, 02:08 PM   #27
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I have a 01 w/ 4.10, and i was wondering how much of a difference it makes in acceleration, and in gas milage, if someone has changed from 4.10 to 4.56
Old 02-26-2003, 04:38 PM   #28
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Alanky
i too have that gq1 , need to get more info cause i just got the pick up on the weekend its a 91 5speed with a 2,5 tbi!
can you post the next code after that...i have a scratch there so hard reading....(??4) the 4 is for sure the first digits are ??
Old 03-01-2003, 01:53 PM   #29
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ok i just bought 03 s10 v6
code say
GU6
G80
that means i have 3.42 with a locker right??
Old 03-01-2003, 04:18 PM   #30
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Thats right.
Old 03-03-2003, 10:42 AM   #31
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thats f*ckin cool huh??
Old 03-14-2003, 11:28 AM   #32
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Quote:
Originally posted by Black Dragon
which trucks usually come with 3.42 from the factory ????
Mine! :cry: :cry:

I want better mileage!
Old 03-14-2003, 02:05 PM   #33
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3.08 with an open rear..that sucks. I wonder if I can find a quaife type diff for my truck. Anyone know if a company makes a lsd with all gears..(no clutches or cones to wear out)?
Old 03-15-2003, 10:07 PM   #34
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My 1991 2wd Sonoma with 4.3 TBI, 4spd auto has a 3.42 in the rear (for now..heh heh).
Old 03-16-2003, 03:50 PM   #35
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are these codes the same in the full size trucks????
Old 03-27-2003, 08:14 PM   #36
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3.73 parts on a 3.42??

Hey everyone.

Okay, I need to replace the rear driver side axle on my truck, and I'd like to know if the axle in my 3.42 is the same as the one in a 3.73.

I can't check the glove box at this time for my truck's codes, but I can tell you that it's a 98 s10 extended cab with a 4.3 V6. I THINK it's a 3.42, but I'm not positive about that.

Also, if I read the earlier posts right (yeah...I'm a newbie at drivetrain tech), if I decided to change out my rear end with the 3.73, that would make my truck faster, but less efficient on gas?

Any "helpful" comments would be appreciated.

Any flames..well, they'd be duly noted.
Old 04-20-2003, 11:48 PM   #37
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Your correct. It would make it quicker out of the hole but not as efficient on gas. You rpms will raise a little also.
Old 04-22-2003, 08:56 PM   #38
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there are two different types of axles used. the number of splines that fit into the spyder gears make the difference. all other spec's are the same. to find a posi, limited, locker, try light line of Louisiana. they have fairly diecent prices. www.lightlineofla.com.
Old 05-10-2003, 02:11 AM   #39
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Differentials

Ok here is a rundown of the different cabs and engine combos for differentials. I found this out just by building an s-10 on chevy.com

2.2 4cyl- regular cab LS - manual tranny/3.73
auto tranny/4.10

extended cab LS- manual tranny/4.10
auto tranny/4.10

regular cab xtreme- manual tranny/3.73
auto tranny/4.10

extended cab xtreme- manual tranny/4.10
auto tranny/4.10


4.3 6cyl- regular cab LS- manual tranny/3.08
auto tranny/3.42

extended cab LS- manual tranny/3.08
auto tranny/3.42

regular cab xtreme- manual tranny/3.08
auto tranny/3.42

extended cab xtreme- manual tranny/3.08
auto tranny/3.42

Positraction is not available on the 4cyl engines

Positraction is available on either the 6cyl manual or automatic transmissions. I didnt get it in mine, darn it I should of ordered one. Ah crap... oh well, better luck some other time. arrrrrr

ANYWAY ENJOY, IM SURE ALMOST EVERYONE IN HERE WILL
Old 06-08-2003, 02:17 PM   #40
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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
Old 06-23-2003, 10:08 AM   #41
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I have the 3.42's and the locker, but my question is this:

When does the locker actually "lock" and how can you tell if it is or not, because mine sure feels like it's engaged all the time. I've never heard any stock truck with as loud of drivetrain as these 03' with lockers. Mines a five speed and maybe it's just a loud tranny? But 1st and 2nd gear are LOUD. Does the locker "lock" when you shift down to slow down?

thanks
John
Old 06-25-2003, 09:45 PM   #42
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Quote:
Originally posted by John Hammer
I have the 3.42's and the locker, but my question is this:

When does the locker actually "lock" and how can you tell if it is or not, because mine sure feels like it's engaged all the time. I've never heard any stock truck with as loud of drivetrain as these 03' with lockers. Mines a five speed and maybe it's just a loud tranny? But 1st and 2nd gear are LOUD. Does the locker "lock" when you shift down to slow down?

thanks
John
The locker locks up when it senses a difference in the rate at which the rear wheels turn. Say you take off from a stop while making a right turn. The inside rear tire is gonna spin, right? A locker would cause the outside tire to spin, too. If both are spinning at the same speed, then the locker will not lock up.

On an unrelated note, it looks like I have the GT4 code in my '98 Blazer 4-door, and the G80. So I have 3.73 gears and a locker, right? I thought only the ZR2s came with the 3.73s though....
Old 06-25-2003, 09:50 PM   #43
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How hard is it to change a 3.42 gear to a 3.73? Is it a do-it-yourselfer?

Clueless
Old 06-26-2003, 09:17 PM   #44
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GU6 and G80, I cant complain its a pretty good setup.
Old 07-05-2003, 10:18 PM   #45
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i know iam probably on the wrong page,but i have a 85 s15 rear end with the code GAD on it.can anybody tell me anything about this code.
Old 07-05-2003, 10:30 PM   #46
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i got GT4-3.73.
Old 07-28-2003, 02:14 AM   #47
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i'm lost. exctaly what row/column do i look at to find out what gear ratio i have?
Old 07-28-2003, 02:35 AM   #48
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never mind the my last post. i found it out. i have a gu4 code. its a 3.08 rear axle ratio.

so taller gears get better gas mileage. what short gears do?
Old 08-01-2003, 01:35 AM   #49
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faster acceleration
Old 08-07-2003, 07:08 PM   #50
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ok i could not find the codes you have listed heir is what i saw .

92 4.3 tbi 5sp / 1gccs19z2n2129397
cs10653
wa-l9096 v9096
93 2.8 tbi 5sp / 1gccs19r4p0148838

what does this mean ????
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