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The ZR2 rear is 4" wider than a non-Z rear end. From the factory, your rear track is 2.6" shorter than your front track, so with a ZR2 rear, your rear end will now stick out .7" more on each side, relative to the front end.
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What about the driveshaft? I did some more searching and it looks like the driveshafts are different lengths. Is this true?
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1996 Blazer LT 4x4
2" PA Body lift
1.5" shackles/ 1.5" T-bar's cranked
32" Sport King A/T
Brute Force CAI
2.5" stainless steel magnaflow cat back
Taurus e-fan
Ford 8.8" rear end (4.10)
Wait4me Tune
http://www.cardomain.com/id/Millert
Remember that you have a lsip yoke in the t-case. Depending on how much of a difference there is you may not need another driveshaft. I would think the ZR2 would have a longer pinion then a 7.65.
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'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My