Try to find a rear out of a late 70,s truck,it will fit with a little modification.I used a dana 70 out of a 78 camper special.Should work fine with your 19.5 wheels.
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Floyd

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Floyd

If we choose being kind over being right,we will
be right every time.
Knowledge is a poor substitute for experience.
Remember what is precious to another, may not be to you, but it
is precious nonetheless.

1948 Chevy 2-Ton