Re: 1976 K20 - Factory front Posi?
I can't answer yes or no on whether it was available from the factory, but it would NOT be in an original automatic-equipped truck that came without locking front hubs. From what I've seen, automatic trucks always had fully-engaged front hubs--they'd make short work of a posi unit up front.
Now, if it was a manual trans, with manually-locking hubs, there's no reason it couldn't have a posi unit it in, as driving down the road with the front hubs disengaged wouldn't be spinning the posi unit and wearing out the clutches in turns and corners.
-Brad
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'61 Suburban daily driver: off the road due to 180-pound 8-pt buck!
'62 K-10 long-step project
'61 C30 Camper, aka "Valdez"
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