94 Tcu On A 91 Q45

[oxs1]

I heard you can install a 94 tcu on a 90-93 Q45. When you install it you can start off from fisrt gear instead of D. What are the after effects if any and are there any downfalls?

[Q451990]

Actually it's the 1993 TCU p/n 31036-64U20 or 64U75. The 90-93 had the same transmission, but the 1993 was the only one with 1st gear start. The 1994-1996 had different gearing so the shift points in the TCU/ECU are different.

If you keep the original 90-92 ECU I've herd that you can have some issues at redline when you hit the rev limiter. Conveniently I have a matched pair (ECU and TCU) from a 1993 with no options (Active or TCS) that I'm selling for $300 for the pair.

The going price for just the TCU is about $150-175.

Heath