aluminum case 833 trans

Are you sure it's a regular 4-speed and not an overdrive? Most of the overdrives were aluminum case. And most had problems with the case wearing out at the countershaft. If you have an OD, sell it and get one from an F-body, as they were the short tail. If it is a real 4-speed, you can convert it to the short tail, but you need to use the output shaft as well as the tail housing. Basicly, a complete trans rebuild using the aluminum case and lots of pieces from your other 4-speed.