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05-08-2012, 02:05 PM
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#1 |
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Super Member
 
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S10 Rear Diff Measurements
Simple questions.
Is the 4wd s10 rear truly wider than the 2wd rear and if so by how much? I have read that they are about 4" wider. Is our rear diff a 2wd or 4wd s10 rear? I assume 4wd but want to be sure. Are the first and second gen s10 rears the same width? I know these trucks have 3.42 gears, I thought I read somewhere that most 4wd s10s are 3.23 gears, and there were also 3.08s in some s10s but I think only 2wd. What models could have had an 8.5" 10 bolt installed besides the zr2s and extremes? I'm hoping someone may have this info or a link to lots of s10 rear info. TIA.
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05-08-2012, 02:31 PM
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#2 |
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Donating Member
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Re: S10 Rear Diff Measurements
I was looking up this info a little while ago,
measuring backing plate to backing plate, 2wd - 48" 4wd - 52" I believe the sy/ty's are the 52" width which accommodates the common corvette rim swap. I also believe 1st/2nd gen maintain the same widths. The 8.5's were stock on the Zr2's but not on all extremes. I read somewhere all 98+ models that came with the manual trans also came with the 8.5 but can't verify that personally. The 8.5 is a lot less common then the 7.5 but it shouldn't be to hard to find one especially in the 4wd width. Most 4wd's came stock with 3.42 or 3.73 gearing. |
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05-08-2012, 03:19 PM
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#3 |
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Re: S10 Rear Diff Measurements
backing plate measurement really isnt that great.
You need the WMS (Wheel Mounting Surface) measurement. 2WD - 54.5" 4WD - 59" (I've also seen people say 60") The ZR2 axle is also wider than the stock 4x4 axle, coming in around 63.125" I've also read about (but havent seen) that 8.625" axles were popping up in some trucks from 99.5-05, again cannot confirm.
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05-08-2012, 04:33 PM
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#4 |
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Re: S10 Rear Diff Measurements
For the 8.5 rear this is what I have seen.
I have only found the 59" 8.5 in the drum brake 4wd non zr2 5speed 2 door blazer with 3.42 gears and the gov lock. And I have only found three of them in many years of looking... I haven't been lucky enough to find a NON - ZR2 8.5 with disc brakes... YET!
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05-08-2012, 07:01 PM
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#5 |
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Donating Member
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Re: S10 Rear Diff Measurements
el diablo, good point the wms is the better measurement to go by.
Fivetodrive, I wouldn't kill yourself looking for the disc brake version as doing the disc brake swap is very easy and other then factory bolt on parts the only extra thing needed is some spacers for behind the dust shield to maintain the proper rotor to caliper offset. There is a good number of 8.5 non zr2 4x4 rear ends for sale on car-part.com right now. |
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05-08-2012, 08:57 PM
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#6 | |
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Donating Member
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Re: S10 Rear Diff Measurements
Quote:
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05-09-2012, 02:11 AM
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#7 |
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Donating Member
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Re: S10 Rear Diff Measurements
I had always heard that it was the manual trans 4.3 trucks that usually came with 8.5" diffs, i haven't really researched it much though. As mentioned the ZR2's had them, but those don't really matter for us guys.
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05-11-2012, 02:25 PM
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#8 |
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Super Member
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Re: S10 Rear Diff Measurements
I have some more measuring to do, but a 2wd rear might work perfectly for what I am doing if they are ~ two inches narrower on each side...
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05-12-2012, 01:08 PM
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#9 |
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Donating Member
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Re: S10 Rear Diff Measurements
http://www.syty.net/forums/showthread.php?t=18377 I thought this suject sounded familliar!!
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