What rearends are in the Blazers?
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RE: What rearends are in the Blazers? - 1/16/2007 4:50:37 AM
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Chevy Lover
General Tech Moderator
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Rear Axle Identification
In your glove box you should have a list of RPO codes. Diff codes srart with a G
GT4
Rear Axle: 3.73 Ratio
GT5
Rear Axle: 4.10 Ratio
GU4
Rear Axle: 3.08 Ratio
GU6
Rear Axle: 3.42 Ratio
G67
Level Control: Automatic
G80
Rear Axle: Positraction
< Message edited by Chevy Lover -- 1/16/2007 4:52:53 AM >
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RE: What rearends are in the Blazers? - 1/16/2007 7:39:37 AM
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drperry
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10 bolt, and if I remember right, it's a 7 5/8"
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RE: What rearends are in the Blazers? - 1/16/2007 7:41:44 AM
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tammikm
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whats the preferred rear end? besides a nice blonde.. hehe
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RE: What rearends are in the Blazers? - 1/16/2007 7:45:04 AM
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DetroitMuscle
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Depends what years but I think most 1st gens are using the same rear ends as the f bodies just different supension.
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RE: What rearends are in the Blazers? - 1/16/2007 7:53:51 AM
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swartlkk
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The ZR2 & Highrider suspensions (Chevy & GMC variants) has an 8.5" rear ring gear. All others have the 7-5/8" ring gear. And yes, they are the GM-corp 10 bolt. The G80 locker is GMs Gov-loc arrangement and while it may be perfectly fine for on road to light offroad use, anything more and you'll want to put in a true posi or locker setup depending on your level of offroading.
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RE: What rearends are in the Blazers? - 1/16/2007 7:58:33 AM
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drperry
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quote:
ORIGINAL: swartlkk
The ZR2 & Highrider suspensions (Chevy & GMC variants) has an 8.5" rear ring gear. All others have the 7-5/8" ring gear. And yes, they are the GM-corp 10 bolt. The G80 locker is GMs Gov-loc arrangement and while it may be perfectly fine for on road to light offroad use, anything more and you'll want to put in a true posi or locker setup depending on your level of offroading.
Got any suggestions on a good posi? Locker's are cool and all... but a posi rocks for 2wd slides, lol
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RE: What rearends are in the Blazers? - 1/16/2007 8:09:36 AM
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DetroitMuscle
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quote:
ORIGINAL: drperry
quote:
ORIGINAL: swartlkk
The ZR2 & Highrider suspensions (Chevy & GMC variants) has an 8.5" rear ring gear. All others have the 7-5/8" ring gear. And yes, they are the GM-corp 10 bolt. The G80 locker is GMs Gov-loc arrangement and while it may be perfectly fine for on road to light offroad use, anything more and you'll want to put in a true posi or locker setup depending on your level of offroading.
Got any suggestions on a good posi? Locker's are cool and all... but a posi rocks for 2wd slides, lol
Auburn makes good posi units, I used to run an air locker in my "strip/street" car, I am looking into the powertrax for the blazer, if you know how to use tools you can install it yourself in under an hour without touching the gears.
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RE: What rearends are in the Blazers? - 1/16/2007 8:14:44 AM
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swartlkk
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It all depends on if you have the G80 locker or not. In an open case, everything can be installed without removing the carrier. If you have the G80, I don't think anything goes into a G80 carrier... So that means you'd need to find an open diff carrier and transfer over your gears, install new bearings, then install the posi/locker unit of your choice.
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RE: What rearends are in the Blazers? - 1/16/2007 8:16:28 AM
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drperry
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quote:
ORIGINAL: swartlkk
It all depends on if you have the G80 locker or not. In an open case, everything can be installed without removing the carrier. If you have the G80, I don't think anything goes into a G80 carrier... So that means you'd need to find an open diff carrier and transfer over your gears, install new bearings, then install the posi/locker unit of your choice.
Bollocks! lol
I've got the G80 -_-
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RE: What rearends are in the Blazers? - 2/13/2007 11:20:08 PM
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Mapoftazifosho
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I am showing codes gt4, g67, and g80.
So I have 3.73, positraction, and the level control.
What is the level control?! The autoride?!
I thought that was ZW7, which I am showing in my glove box.
One last thing, the positraction diffs how do they work?! Gears or clutches? I will search for a diagram in the meantime.
Also what kind of synthetic diff fluid do you all run?! I will do my research on this, but I am just curious.
< Message edited by Mapoftazifosho -- 2/13/2007 11:29:08 PM >
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RE: What rearends are in the Blazers? - 6/7/2007 10:13:24 AM
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Hanr3
Wheels & Tire Moderator
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Ths codes listed by Chevy Lover look to be for a Fullsize Blazer and not the S-Series Blazer.
I'll see if I can find the S-series version.
Edited. Try this version. Enter your codes and click check codes.
http://www.s10forum.com/rpo/index.php
< Message edited by Hanr3 -- 6/7/2007 10:20:50 AM >
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RE: What rearends are in the Blazers? - 6/7/2007 10:45:02 AM
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Jigg
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Some non-ZR2's came with the 8.5" rear end actually. Here's the one on the '98 blazer i bought to part out:
and here's one from a '97 ZR2:
and here's one from a '97 non-z blazer:
and here's the newer one on my '00 blazer ZR2:
The 8.5's have square tabs on the bottom of the diff, compared to the pointier tabs on the smaller rears, like in my brother's blazer:
< Message edited by Jigg -- 6/7/2007 10:49:00 AM >
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RE: What rearends are in the Blazers? - 6/7/2007 2:27:37 PM
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drperry
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Must've been a hidden factory option or something... Wonder how hard it'd be to swap out the axle/rear end... lol
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RE: What rearends are in the Blazers? - 6/7/2007 6:49:58 PM
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Jigg
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Not that hard really... i've got one for sale if you want it 
It even has a G80, disc brakes, and 3.42 gears... you'd be all set! Between the 8.5" rear and the iron front diff you have, you'd be pretty well setup for lockers!
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RE: What rearends are in the Blazers? - 6/7/2007 9:03:55 PM
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Hanr3
Wheels & Tire Moderator
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Thanks for the info on the 8.5" in non-ZR2 trucks. Are there any other ways to identify them? Like id dthey only come behind manual tranny trucks, or something like that? Is there a code in the glove box for them?
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"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
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'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: What rearends are in the Blazers? - 6/7/2007 9:14:07 PM
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Jigg
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There's no code in the glovebox, but i do know that the squared off tabs are a dead indication.
Also, all 5spd blazers and S10's from 95 on (i believe, it might ahve been earlier) came with an iron front diff... so i wouldn't put it past GM to have included the 8.5" rear end in that unspoken package.
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RE: What rearends are in the Blazers? - 6/7/2007 9:26:21 PM
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lastcoupe
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You may be onto something with the manual trans only thing Tim, a buddy had a 2003 s-10 with ZQ8 suspension, he ordered it with a manual trans and a 3.08 gear because it was the steepest gear ratio you could get that year with a manual trans. So the day after he took delivery of it we ordered a 3.73:1 gearset for a 7 5/8" rear, and it turned out he had a 8.5" housing. we never expected it at all, but a very welcome surprise of course. My ex-father-in-law has a 1998 s-10 SS (yes a real B4U optioned truck) that he ordered with an automatic and a posi, and he has a 3.42:1 gear and a 7 5/8" rear end. The CAR that I got my 8.5" posi out of for my Caprice was an olds, and when I was researching the ring gear size it DID have an option code for the 8.5" ring gear, it was GM8, but IDK if that is a valid code for the ST trucks.
EDIT......Hey Jigg, is that 8.5" G80 out of a 2-door or a 4-door? If it comes with a manual only, it's have to be a 2-door of course, but aren't they different lengths? IIRC, the 4-door's rear axle housing is a couple inches wider?
< Message edited by lastcoupe -- 6/7/2007 9:30:48 PM >
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