The MKIV supras came with a w58 5 speed and a getrag 6 speed, so you will need to obtain a r154 off of a MKIII supra and purchase a 1jz bellhousing. Driftmotion has the 1jz bellhousings for sale, and you may be able to find one on some of the supra forums for a little bit cheaper, but most people know what they have when it comes to this stuff so it's not going to be cheap unless you are able to get a trans from a salvage yard.