So, I get a lot of requests from MK3 guys asking if I can provide a T56 Magnum Swap kit for their MKIII Supra. Short answer, I can but it is not a truly bolt in affair.
Reason being the MK3 tunnel is very tight near the tail case of the transmission, and the stock crossmember mounting points on the drivers side need to be heavy modified or even removed. Therefore, I am not comfortable making a crossmember that bolts to the factory points.
However, one of my customers came up with a nice solution using one of my chromoly crossmember fabrication kits. I am going to make a jig up with this crossmember solution, so if you are interested in a full "bolt-in" kit I will have that available soon. The only modifications you will need to do is clearance the drivers side crossmember mounting point, and drill four holes in the factory rails to use as new mounting points for the crossmember.
Here are some pictures David sent me of his MK3 crossmember fab work.
Here you can see where the drivers side oem crossmember mounting point was removed to clear the transmission case.
So, for you 2JZ swapped MK3 guys that want a stout transmission, this is now a reality... it will just require a bit more work than my other kits in terms of bolting up a crossmember.