If you can settle for a 5spd, you could always use a R154 using a 1JZ bellhousing to mount it to your 2JZ engine. This is what a LOT of Drag Racing Supra customers of ours do (yes, we build transmission for Drag Supras!!)
Here is our Race R154 that we sell to Supra owners. This has the 1JZ bellhousing that fits the 2JZ:
Product link: http://www.marlincrawler.com/transmission/rebuilt-complete/r154-2wd-race
(http://www.marlincrawler.com/sites/all/marlin/files/transr154640_rb.jpg)
and here is our Competition 2WD R150 transmission rebuild:
Product link: http://www.marlincrawler.com/transmission/rebuilt-complete/r154-2wd-race
(http://www.marlincrawler.com/sites/all/marlin/files/transr150r640.jpg)
The gear ratios are as follows:
| 1st gear | 2nd gear | 3rd gear | 4th gear | 5th gear |
R154 | 3.250 | 1.955 | 1.310 | 1.000 | 0.753 |
R150 | 3.830 | 2.062 | 1.436 | 1.000 | 0.838 |
We haven't put both feet in the Supra market yet, and still there are a lot of people talking about our Short Throws and upgrade parts for Supra transmissions.
We have a lot of upgrade parts for these...
Heavy duty center plates:
http://www.marlincrawler.com/transmission/parts-upgrade/heavy-duty-bearing-cover-plate
(http://www.marlincrawler.com/sites/all/marlin/files/transbearingcover_hd640_2.jpg)
Heavy duty billet shift fork:
http://www.marlincrawler.com/transmission/parts-upgrade/billet-shift-fork-r-series
(http://www.marlincrawler.com/sites/all/marlin/files/fork_r640.jpg)
Heavy duty shifter seats:
http://www.marlincrawler.com/transmission/parts-upgrade/heavy-duty-shift-lever-ball-seats
(http://www.marlincrawler.com/sites/all/marlin/files/seats640.jpg)
Heavy duty shifter sockets:
http://www.marlincrawler.com/transmission/parts-upgrade/heavy-duty-shift-lever-socket
(http://www.marlincrawler.com/sites/all/marlin/files/sockethandle640.jpg)
Heavy duty output seals:
http://www.marlincrawler.com/transmission/parts-upgrade/heavy-duty-transmission-output-seal
(http://www.marlincrawler.com/sites/all/marlin/files/transoutputseal_hd640.jpg)
Heavy duty pressure plate bolts:
http://www.marlincrawler.com/hardware-tools/hardware/heavy-duty-pressure-plate-bolt-kit
(http://www.marlincrawler.com/sites/all/marlin/files/pressureplateboltkit640.jpg)
Short throw kits:
Oh yeah, we also offer Chromoly thrust washers that are not on the website at the moment