Get fortune auto coilovers. You can get custom spring rates of any choice and they will valve them to match. All sets of coil overs are made in the usa and are all dyno tested and come with the dyno sheet.
Sure the mounts are on the correct side?
Did you have a front sump and switch to a rear sump? If yes the turbo drain that mounts to the pan is different.
That whole front area is a major weak point. ive also see the rear diff mounts crack loose as well.
having an old rusty frame doesnt help things either.
Its also good to entirely strip the whole sub frame and then go over all the stock welds and what no. ive see seperation before on both front and rear subframe where 2 pieces of metal meet together.
and then after you can por 15 or powder coat it for durability.
http://www.toyotapartszone.com/parts-list/1991-toyota-supra/transmission-gear-mtm.html
Shows it's not discontinued.
Did you try champion or elm hurst toyota?
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