Be aware that if you chose to swap an 8-1/4" or 8-3/4" rear for your 7-1/4" rear, you will have to have your driveshaft cut down and re-balanced (cost me about $50 when I got mine done). Otherwise, it's a bolt-in...though you'll need the u-bolts and shock plates that go with the new axle, as the axle housing tube is larger in diameter...also best to snag the e-brake cables and associated hardware and the brake flex-hose that connects the hard line on the floorpan to the T on the axle housing: you'll want this for reference even if you plan to buy a new one). If you pick your pieces right, you'll wind up with a stronger rear, larger BC / diameter wheels AND bigger rear brake drums.
Mopar offered the A-833 4-speed for the slant...here's what you need to know about that:
http://www.slantsix.org/articles/4-spee ... speed1.htm
http://www.slantsix.org/articles/clutch ... utches.htm
Stay away from the manual 3-speed column shifts: they're not a very satisfactory option.
You should consider a '74-'76 front disc brake swap as well (if you're mechanically inclined or have experienced help) so you'll be running the same bolt circle all way round. The increased stopping power is well worth the work, in my opinion.
Good luck with your swap!
---Red
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