a999 modification questions

The best theory I've found to go about it is to use the 93+ flat hub pump and gears, the front half, bolted directly to the older stator/reaction shaft, with a 78+ 2 ring 27 spline input shaft. If the pump you have is lock-up, simply remove a checkball like below with a carbide dremel bit and a pick. Then you can use the pump you have. You can pick up the input shaft, front pump and gear for cheap at wittrans.com:

727:



904 Lock-up:



Non:







Then, get a converter company to cut you a nice, possibly 9.5" converter. :D