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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 :)
 
#77 ·
MuddyS10
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User is: OffLine 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.

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...
 
#82 ·
where can i get a zexel torsen LSD?
 
#83 ·
where can i get a zexel torsen LSD?
 
#85 ·
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.
 
#86 ·
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?
 
#88 ·
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
 
#90 ·
350*s-blazer said:
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
 
#93 ·
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
 
#94 ·
drpd10 said:
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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