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Hi,
The car is certainly drivable with the automatic rear end. I myself would complete the transmission swap first, then worry about the rear end later. If you have a core axle, then you just take your time rebuilding it until it’s convenient. The carrier will only accept ring gears of specific ratios. If you swap the carrier, it’s usually best to check the bearing clearance which can be a pain.
Without the swap, your car will have better acceleration, but a lower highway top speed / fuel economy sweet spot.
Goatman
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