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Re: rear end
G80 Rear Axle - Positraction
G86 Rear Axle - No Spin
G87 Rear Axle - Power Lock
G80 is for the 1/2 Tons.*
G86 for the Eaton 3rd member...
G87 is for the Dana 60's
Taken from a GM parts manual, from another members post. The G87 option is a Dana 60, 67-72 only option.
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