I have a very noisy 7 1/4 and want to replace it with a 8 3/4 rebuilt sure grip that I own. The 8 3/4 has new 10' brakes, shoes and wheel cylinders is complete with new small bolt pattern drums bearings etc. The front of the car has been installed with 10' drums and a dual master cylinder. It is a daily driver. What else do I need to complete the job?

if this rebuilt 8.75 is the correct length and has the spring perches set to match yours, you will need to shorten your driveshaft and get a rear universal joint that fits the 8.75 yoke. Check here for measurements you'll need

ATB

BC

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'64 Dart GT convertible, 64 Dart 170 2-door post sedan in faded blue and rust (the Az Dart) & a sixty THREE Dart 170 2-door post sedan in faded blue and rust. (future project)
Early Dart Disorder (EDD) is real, and I've got it!

You will also need the shock plates and U-bolts for the 8 3/4.
DD

As mentioned the driveshaft is shorter for a car with an 8 3/4 than for one with a 7 1/4. You also need U-bolts and the plates which go under the springs and carry the lower shock mounts. This is due to the 8 3/4 having 3" diameter axle tubes and the 7 1/4 having 2 1/2" tubes. Unless you have a large yoke on the 8 3/4 the U-joints will stay the same. You may need to keep your old parking brake cables.

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Joshua

Driveshaft will need to be shortened about 1-3/4".

If you are lucky your 8-3/4 will have the 7260 yoke on it and your small u-joint will work.

If it has the 7290 yoke there are adapter joints available.

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Official Cookie and Mater Tormentor.

A chart have says 2.26 inches--

I always get the new rear installed, then measure-out the needed driveshaft length...
There is just too much variation, vehicle to vehicle.
DD