8 3/4 transplant into my 66

Way back in 1972, I had a '64 Valiant (original car was a 273, 3-speed stick with a ball-and-trunnion driveshaft) and a 7.25" rear.

From a local junk yard, I purchased a 1971 340/4-speed/8.75" rear end and driveshaft, all out of a rolled '71 Demon. As I said, everything came out of that car. My car had a 106" wheelbase; the Demon's wheelbase was 108".

Once I had the engine and transmission bolted to the mounts, and the rear-end bolted to the springs, I decided to fit the driveshaft into place to see how much too long it was. The wheelbase of the car it came out of was 2" longer than the car it was now in.

Surprise!!!! It fit perfectly! I was sure it would bottom out in the tailshaft case before the rear U-Joint lined up, but that didn't happen; it has a little over an inch of free forward travel in the tailshaft with the rear wheels on the ground.

I used it "AS IS" and it never gave any problems, but this has remained a mystery to me for thirty-seven years.. It should NOT have fit without cutting. I thought I was losing my mind....

I wonder, to this day, how that was possible, but I really didn't have the money to have the driveshaft cut, so I didn't ask questions.... I just was thankful it worked.

How this relates to your situation, I'm not sure, but it might be possible for you to use a stock 340 A Body driveshaft and avoid cutting one up.

Be sure to measure twice before trying that, though... I might have been just lucky, I dunno...:happy6:

Good luck!