1965 Dodge Dart stock differential advice

eekvonzipper said

Does a 7 1/4" Sure-Grip just drop-in to the same Open-Rear Axle?

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No simple drop-in differential changes for 7-1/4. Need before and after measurements, a housing spreader, arbor for more measurements and possibly different shims. Bearing and seals may need changed, also require additional tooling todo.