If it's only driving through the front axle I'd be looking at the rear.
If there is no drive to the rear wheels then with out the centre diff in you won't move.
Your speedo works so this indicates your rear tail shaft is turning.
I'm not up on D1's but from what I've seen there are a few areas to look.
Axle end caps could be striped.
May be a broken axle.
Or maybe in the diff itself.



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