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rear axle ratio RPO

453K views 424 replies 263 participants last post by  Rhotpursuit 
#1 ·
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 :)
 
#135 ·
yes you can put in a g80, but if your gonna put posi in an open diff i would get something a little better thana a g80 and gears have to be installed by a pro, the tolerances have to be perfect adn if they are not, you will eat up gears
 
#136 ·
2WD said:
Can i put a G80 posi and 4.10 gears in my truck that has 3.43's before?
i dont think you can. because the 342's have 26 spline axles and the 4.10's have 32 i beleive. but you can get an aftermarket set of gears from richmond for your 26 spline axles w/the 4.10 ratio and a posi unit from auburn or eaton for like 400 and the gears for like 200. but you would be better off to buy a 3.42 posi or somthing like that from the boneyard. but it all depends on your application. if your goin for all out racing and want good 60' times then the 4.10's would be great but if your goin for economy and mild performance then the 3.42's would be sufficient.
 
#138 ·
I LOVE these kind of informative type threads!
Thanks guys,I had questions about my 3:42 G80 S-10 and well.........now I dont!!!
Dont get me wrong you Limited slip(or w/e you call it)guys,I love the one wheel peel,this is my first"locker".
Keep posting and I'll keep reading!
Im a newb too this code searching thing!
 
#142 ·
I have been playing with the caculators on http://www.machperformance.com/calculators.html and im messing with the mph for rpm rance one. The truck is a 97 4.3 5spd ext cab. z85. The code in the glove box is gu4 3.08's but when i got to messing with that caculator it dosant add up. i am at 2450 rpm's at 70mph in 5th gear (.78 OD right?) That adds up to a 3.43 rear end?!!! I have the stock tire size on it. If i did have 3.08's id be going 70 mph at like 2150 rpms

I Cant make the numbers add up, what overdrive dose my trans have?
 
#143 ·
Generic0 said:
I have been playing with the caculators on http://www.machperformance.com/calculators.html and im messing with the mph for rpm rance one. The truck is a 97 4.3 5spd ext cab. z85. The code in the glove box is gu4 3.08's but when i got to messing with that caculator it dosant add up. i am at 2450 rpm's at 70mph in 5th gear (.78 OD right?) That adds up to a 3.43 rear end?!!! I have the stock tire size on it. If i did have 3.08's id be going 70 mph at like 2150 rpms

I Cant make the numbers add up, what overdrive dose my trans have?
.83 OD
 
#144 ·
Thanks for the overdrive # but that dident make a diffrance. im at 1500rpm in 4th gear at 35 mph. what makes peferct sence is is that i somehow got 3.43's with an open diff but with the gu4 in the glove box. If you use the caculator with 3.43's and a .83 od I turn 2460 rpm at 70 mph, My spedo is dead on. So where is the id numbers on the rear end at?
 
#145 ·
Generic0 said:
Thanks for the overdrive # but that dident make a diffrance. im at 1500rpm in 4th gear at 35 mph. what makes peferct sence is is that i somehow got 3.43's with an open diff but with the gu4 in the glove box. If you use the caculator with 3.43's and a .83 od I turn 2460 rpm at 70 mph, My spedo is dead on. So where is the id numbers on the rear end at?
they are on the carrier somewhere. i think around the input shaft.
 
#148 ·
Heres the numbers on the right side axle tube AA1 K 348 2

I have a full set of service manuals for a 99 but they dont show the AA1 paart that tells you the gears
 
#150 ·
i have an 87 s10 2.8L 5 spd 4x4 with a 3.73 posi, i've broken some of the disks in the posi and theres gettin to be a good build up of shrapnel on the magnet, so im lookin for another rear end, does anyone know if theres any problem with putting in a 83 blazer rear end?
 
#151 ·
Gspot said:
i have an 87 s10 2.8L 5 spd 4x4 with a 3.73 posi, i've broken some of the disks in the posi and theres gettin to be a good build up of shrapnel on the magnet, so im lookin for another rear end, does anyone know if theres any problem with putting in a 83 blazer rear end?
as long as its 4x4 and your 87 dosent have ABS. i think in 87 they started puttin ABS on em. so the 83 wont work if yous has ABS
 
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