ZR2 3.73 Rear End Gear Question???? - S-10 Forum
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ZR2 3.73 Rear End Gear Question????

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Old 06-14-2006, 12:23 AM   #1
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ZR2 3.73 Rear End Gear Question????

Im new to this site, so im not sure if this question was previously posted by someone else...

I have a 2003 ZR2 Blazer with a 3.73 rear end gear,
and was curious if anyone had installed a posi traction style rear end gear setup??

I know that companies like Richmond and others make them for certain applications. I am having trouble finding out what rear gear I have.

I know its 3.73 and think that its 8.5" but am not sure who makes one for this..and what to buy. Someone else posted something about it being 8.5" GovLock..But I am not familiar with that either...any help appreciated..
Old 06-14-2006, 01:21 AM   #2
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Re: ZR2 3.73 Rear End Gear Question????

a freind suggested EATON..but they have several

im looking at www.summitracing.com under Eaton 8.5 as search term....
Old 06-14-2006, 06:09 PM   #3
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Re: ZR2 3.73 Rear End Gear Question????

If you have RPO code G80 it's already Posi - I would think it would already have to be if it's a 4x4 but I could be wrong. On the flip side I have NO idea what size axle the Blazers are... being in a ZR2 spot I know the ZR2's are 8.5 inches... but sadly I can't tell you what Blazers are.
Old 06-14-2006, 09:00 PM   #4
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Re: ZR2 3.73 Rear End Gear Question????

how do i know if i have code g80 is it labled or written anywhere? i havent beat on it yet, waiting for mods, so it could have some type of posi limited slip i suppose..i felt one tire pull hard last time i punched it...
Old 06-15-2006, 05:00 AM   #5
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Re: ZR2 3.73 Rear End Gear Question????

G80 is'nt positive traction,its limited slip.Look at the RPO label in your glove box.

Come on over and join up at www.zr2usa.com
Old 06-23-2006, 03:00 AM   #6
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Re: ZR2 3.73 Rear End Gear Question????

Pretty sure all Zr2s had the LSD. Could be wrong though.

If you have a gov-loc it should say g80 on the sticker inside the glove compartment (in with all the other codes). Right next to gt4 (the code for a 3.73 rear).
Old 06-23-2006, 05:59 AM   #7
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Re: ZR2 3.73 Rear End Gear Question????

Quote: Originally Posted by j894
Pretty sure all Zr2s had the LSD. Could be wrong though.

If you have a gov-loc it should say g80 on the sticker inside the glove compartment (in with all the other codes). Right next to gt4 (the code for a 3.73 rear).
I've seen non-G80 ZR2 rears go across Ebay, so either they all didn't have gov-loc or somebody have blown it and replaced it or the seller didn't know what he was selling. A lot of guy test for posi by spinning the one wheel and seeing which direction the other one spins, with the car off the ground. This does not always work, with all types of carriers. One of my buddies got a true trac for next to nothing, because the guy that was selling it thought it was broken.
Old 06-26-2006, 04:27 PM   #8
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Re: ZR2 3.73 Rear End Gear Question????

Early ZR2's did not come standard with the G80 Gov-lock. Sometime around 97 or 98 this changed, and from then on all trucks were so equipped stock. As someone mentioned above, check the sticker in your glove box... you'll see G80 as one of the many codes listed. The G80 does not kick in until one tire is spinning quite a bit faster than the other (I've heard 100 rpms, but I'm not sure on that), so its quite possible to feel one side pulling hard off the line.
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