TCU first gear start upgrade?

[Mikey_ZX]

Hello everyone,

I was wondering where my transmission control unit is located in my 1991 Q45? Also,
I was wondering where can I find or purchase a 93 first-gear start transmission control unit for my 1991 Q? Or I might just pick one up at the junk yard when I get the chance, so where on the car can I locate this component?

[Q45tech]

WONDERING can be solved via READING a few thousand historical posts and comments and reading your personal copy of Factory Service Manual included with every brand new 90-93 Q45.
TCU inside left [drivers] kick pad.

[Mikey_ZX]

Thanks for letting me know where the TCU is located because when I bought my car, it never came with the service manual. Thank you again!

[Q451990]

The "correct" 1st gear start TCU for your car would come from a 1993 Q45. That's the only year that had a transmission identical to yours in terms of gearing, and came with 1st gear start. It's part number will end with 64U20 or 64U75(rare).

You can search for one at www.car-part.com or check out our classified section here. If you have a pull-a-part style salvage yard (www.pullapart.com) nearby, you can get some really good deals that way.

That said, many members have had good experiences with the 94-96 TCU as well. Those years were 1st gear start, but had transmissions with different gear ratios.

The factory service manual for the 1994 and up Q45 is available at www.nicoclub.com/FSM/ - online copies weren't available for the earlier models, but a good bit still applies - torque specs, most component locations, etc.

Heath

[Mikey_ZX]

Thanks for replying and answering my questions, I'll try the TCU's from those later years as well. Also, thanks for the part number on the 1993 TCU's.

[Mikey_ZX]

Thanks to the members who helped me out with my questions regarding this post. I was able to get a 1993 TCU from the junk yard that had the part number listed from you guys and it works great. Thanks again!

[Q451990]

[lino]

Thanks to the members who helped me out with my questions regarding this post. I was able to get a 1993 TCU from the junk yard that had the part number listed from you guys and it works great. Thanks again!

Congrats! Feels great doesn't it . I know when I switched mine, I was very surprised. What's the part number of 1993 TCU you bought? 64U20 or 64U75?

[Mikey_ZX]

I found the 64U20 TCU, is there a difference in the two different part numbers? I also installed a Hayden Transmission cooler in between the condenser and the radiator. I was surprised with the TCU, IMO, the first gear start is alot better than driving with the stock TCU, and to have a 1991 Q45 that starts in first gear is fortunate to have. Thanks again to everyone who helped me!

[lino]

I'm glad you're enjoying your new TCU. To answer your question read this thread:

post3536280.html?hilit=counter%20measure#p3536280

[Noobius]

Thanks for this guys... I had no clue where this was... I did a search and this is the only post that I dug up with the correct info location of the transmission control unit that is.