Another matter to consider....
Truck transmissions are often suited for load hauling, not rapid acceleration. The gearing will be different from a transmission designed for a car.
This can be worked around. For example, the ax-15 ratios in my Duster are
1st - 3.83
2nd - 2.33
3rd - 1.44
4th - 1.00
5th - .79
Running those ratios with 2.76 rear gears gives you almost IDENTICAL acceleration in the first three gears as a 904 with 4.10’s, plus gives you 2 more gears. And a .79 overdrive coupled with 2.76’s makes for pretty awesome highway cruising!