If your N/A has an open diff, try to source a LSD from a 87-88 Turbo. 3.90 gearing I believe. 89-92's were 3.73, and my old 87 N/A, which will soon have a 1JZ, is sportin' a 4.30 LSD. Great for off the line punch, but murder on gas mileage and top end speed, unless your'e rollin' tires that are...