Quote:
Originally Posted by 72timemachine
There is a '78 c/10 big 10 a few hundred miles south of my location that has a 5 lug rear axle. I would imagine it is a 12 bolt rear end if it is stock, no?. Aside from this special truck having beefed up suspension, does anyone know if GM gave these trucks limited slip rear ends or was that an option you had to have the dealer order for you back in the day? Any help would be appreciated.
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2wds got the 5 lug while 4wds (halftons) got 6 lug wheels. In 1978 the rear axle should be a 12 bolt but many swap it out to a later 10 bolt rear axle 12 bolt axles were last used in 1981. The limited slip rear end would be optioned as code "G80" which was not a good unit in the half ton trucks. Here is a picture of my SPID label which states the limited slip G80 rearend.