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Discussion Starter · #1 ·
I have searched through the forums and have not been able to find what im looking for. I need to know if i have the 8.6inch or 8inch rear differential. I have a 2005 tb 4.2 ls 4x4 with 3.42 gears.
 

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2003 gmc envoy_slt
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Only the EXT's, XL's, a XUV's have the 8.6". Not sure about the SS.
 

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2004 gmc
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SWB I6 all have 8.0", except the Roadiemobile :D
IIRC, SWB V8 might have 8.6" :confused:
LWB have 8.6" whether they're I6 or V8.
SS is 9.5"
 
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