8.25 gears in a 8.75

x2.

I say sell the 8 3/4 and use the money to buy an 8 1/4 with the right gears. Then use the leftover money for the new driveshaft.

Driveshaft and all the rear discs parts for the 8.25 too, and still have cash left over.

The local pick a part quoted me right around 250 for the entire assembly sure grip or not (didn't change the price)