rear axle ratio RPO - S-10 Forum
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post #1 of 419 Old 07-12-2002, 05:29 PM Thread Starter
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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


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post #2 of 419 Old 09-28-2002, 12:44 AM
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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....

95 sonoma 4x4 SFA and stuff
93 olds bravada AWD
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Last edited by pyros46290; 09-28-2002 at 12:50 AM.
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post #3 of 419 Old 09-28-2002, 01:02 AM
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The G80 is a limited slip, everyone just calls it a locker because they don't know the diffrence
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post #4 of 419 Old 09-28-2002, 01:41 AM
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didnt some of the 1st gen blazer 4x4s come with electric lockers?

95 sonoma 4x4 SFA and stuff
93 olds bravada AWD
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post #5 of 419 Old 09-30-2002, 01:15 AM
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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.
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post #6 of 419 Old 10-09-2002, 12:18 AM
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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......

95 sonoma 4x4 SFA and stuff
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post #7 of 419 Old 10-15-2002, 07:38 PM
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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
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post #8 of 419 Old 10-16-2002, 04:37 AM Thread Starter
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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

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post #9 of 419 Old 10-19-2002, 07:35 AM
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post #10 of 419 Old 11-21-2002, 12:08 AM
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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?

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post #11 of 419 Old 11-26-2002, 02:40 PM Thread Starter
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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.

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post #12 of 419 Old 11-29-2002, 10:58 AM
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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
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post #13 of 419 Old 11-29-2002, 11:24 AM
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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
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post #14 of 419 Old 11-30-2002, 11:56 AM
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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

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post #15 of 419 Old 12-16-2002, 07:05 AM
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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.
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post #16 of 419 Old 12-21-2002, 12:57 AM
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which trucks usually come with 3.42 from the factory ????

`99xtreme 2.2 ex-cab 5spd clear corners billet grille billet bowtie ss mirrors 5% tint shaved emblems sts intake 40-series flowmaster dual friction centerforce clucth w/turdown gutted cat zexel posi w/3.73 panasonic 9200 dvd 7inch mon 2- planet audio 12`s
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post #17 of 419 Old 12-24-2002, 11:09 AM
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I have a 94 4.3L TBI with a 2.73!!

GU2
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post #18 of 419 Old 01-20-2003, 09:24 AM
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What'dya get in first like 45mph lol

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post #19 of 419 Old 01-21-2003, 08:19 PM
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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
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post #20 of 419 Old 01-24-2003, 11:22 AM
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i've got 3.42's with a torsen LSD.:guitar:
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post #21 of 419 Old 01-24-2003, 07:03 PM
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My Old 94SS and my 00 Xtreme both with V6 and Auto
came with 3:42.1 from the factory

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post #22 of 419 Old 01-30-2003, 12:35 PM
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Don't all 2.2s come with the 4.10s?
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post #23 of 419 Old 02-06-2003, 02:32 AM
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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

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post #24 of 419 Old 02-06-2003, 11:48 AM Thread Starter
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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.

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post #25 of 419 Old 02-07-2003, 01:30 PM
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The higher the ratio the better the gas mileage, correct?

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post #26 of 419 Old 02-08-2003, 01:07 AM Thread Starter
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taller gears (lower numbers) are better for gas mileage.

3.08 gets better mileage than 4.56

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post #27 of 419 Old 02-09-2003, 02:08 PM
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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
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post #28 of 419 Old 02-26-2003, 04:38 PM
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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 ??

S10 2,5 with manual trans!1gccS14A3M........,convert to 3,1 / 700R4 out of Fbody or 5.0TPI or LS1..not sure yet
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post #29 of 419 Old 03-01-2003, 01:53 PM
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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??
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post #30 of 419 Old 03-01-2003, 04:18 PM
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Thats right.

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post #31 of 419 Old 03-03-2003, 10:42 AM
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thats f*ckin cool huh??
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post #32 of 419 Old 03-14-2003, 11:28 AM
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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!

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post #33 of 419 Old 03-14-2003, 02:05 PM
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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)?

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post #34 of 419 Old 03-15-2003, 10:07 PM
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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).

Took out a perfectly good 4.3 auto and put a 2.2L 5 spd Isuzu diesel in an 1991 Sonoma Ext cab 2wd (sold)

Did it again with a 1994 S10 2w Ext cab 4.3 auto...

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post #35 of 419 Old 03-16-2003, 03:50 PM
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are these codes the same in the full size trucks????

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post #36 of 419 Old 03-27-2003, 08:14 PM
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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.
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post #37 of 419 Old 04-20-2003, 11:48 PM
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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.
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post #38 of 419 Old 04-22-2003, 08:56 PM
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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.
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post #39 of 419 Old 05-10-2003, 02:11 AM
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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
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post #40 of 419 Old 06-08-2003, 02:17 PM
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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

'99 S-10 4.3 Ext. Cab ZQ8 w/mods

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post #41 of 419 Old 06-23-2003, 10:08 AM
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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

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post #42 of 419 Old 06-25-2003, 09:45 PM
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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....
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post #43 of 419 Old 06-25-2003, 09:50 PM
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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
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post #44 of 419 Old 06-26-2003, 09:17 PM
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GU6 and G80, I cant complain its a pretty good setup.

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post #45 of 419 Old 07-05-2003, 10:18 PM
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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.

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post #46 of 419 Old 07-05-2003, 10:30 PM
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i got GT4-3.73.

1988 S-10 4X4
3.2L (3.1L bored .030 over), speed pro light weight pistons,moly rings, cloyes timing chain,comp cams camshaft,crower high lube lifters,ARP rod bolts,manley valves,GMPP retainers,lunati springs,crower locks,edelbrock headers,JET fuel regulator, JET stage 2 chip,hypertech 180 degree T-stat,injector POD spacer,TBI spacer,dynomax exhaust,high flow cat,ACCEL 8.8mm wires, NGK iridium plugs,MSD blaster coil.
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post #47 of 419 Old 07-28-2003, 02:14 AM
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i'm lost. exctaly what row/column do i look at to find out what gear ratio i have?

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post #48 of 419 Old 07-28-2003, 02:35 AM
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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?

~Disturbing The Peace!!!
~I'm not speeding, I'm qualifying!!!
~If speeding kills.....Consider me dead!!!
~Adrenalin is the best drug!!!
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post #49 of 419 Old 08-01-2003, 01:35 AM
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faster acceleration

1994 Black Regular Cab 4.3 CPI S-10
EGR Mod, Pioneer Premier Deck, ADS Super Chip, turbo muffler minus the cat., Mesh grill insert, 3/4 drop, M3 Mirrors
SOLD
New Stereo: JVC KW-NT800HDT, Focal Utopia 6.75" Components, Bang & Olfsen 4 Channel 600wrms Amp Brigdged, Focal K2P 6.75" Components, Audiopipe 4 Channel Amp Bridged, FOUR Sundown Audio SA-8 V.2 Stock SPL (Reconed & Upgraged for 1000wrms each), TWO Audiopipe AP-18001D's
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post #50 of 419 Old 08-07-2003, 07:08 PM
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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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