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04-19-2011, 09:54 AM
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Registered User
 
Join Date: Apr 2011
Location: Hartford CT
Posts: 223
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2WD standard axles
The truck is a 1980 GMC LWB, originally with a 250/3spd manual. As far as I know the rear axle is original, and according to the service tag it has the "standard" rear axle - no gearing information.
I'm looking to convert to posi, what spline axle would I have in the rear? And just out of curiousity, what was considered the "standard gearing?" Truck is a base model that used to be I6, from what I've read its either 3.42 or 3.73 Thanks!
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-Steve  1980 GMC C15 Sierra LWB Dark Carmine Red/Carmine Int Was: 250/3spd (1980-88), then a 305/TH350 (1988-2011) Now: 5.3/4L60E, 2.73 12-bolt open rear |
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