The block side of each bellhousing should be the same, but the tranny side is different. The 1J bell was used as a crossover from the M series motor, so some of the older trans will fit.
If you want to run the 1/2 J series block with a manual transmission, here's the options from weakest to strongest:
N/A 2JZ bell will accept 4cyl NA truck transmissions, ie W-56 and maybe W-59?.
The 1J bell will accept R series transmissions (R150/R151), but the input is a little short, so you have to swap out the input shaft with a 2wd (R154?) or customize the bell.
Finally, you could use the 6 spd 2jz tranny and go divorced t-case.
You might have some luck over on
http://www.supracharged.com. Check out their forum. Be forewarned, however, they'll try to steer you away from the 1J to the 2J or the 7M, which is not necessarily a bad thing.
