[jocko]

You didn't mention if you want a manual or automatic trans. If you currently have a manual, the you'll have most of the parts to add another manual with o/d. If you don't then you'd need to source the pedals, Z-bar, clutch linkage, bell housing, etc etc.

Anyway,
If you want an Automatic Trans:

From a Chevrolet (so bell housing bolt pattern matches):

- 700R4
- 2004R
Both of which will need a torque converter lock-up kit
Or:
- 4L60E/4L65E
- 4L70E
- 4L80E/4L85E
- 5L40E/5L50E
All of which will need an electronic shift controller

If you want a Manual Trans:
T5 (recommend the World Class version)
TKO 500/600
M-21Y
Keisler RS400/500/600