tranny difference between 1.8 and 2.0 fwd

[fastdsm1]

today I came accross a automatic tranny for free.....First I should say that I have a 93 talon 2.0 FWD NT AT with a blown tranny.My question is...Can I install a fwd automatic tranny that came off a 90 or 91 eclipse with a 1.8? I placed the tranny side by side the other and they seem somewhat the same.

 

[blackbyrd]

I believe it might use a different TCU, and the gears might be lower..
heres a good thread:
http://www.dsmtuners.com/forums/showthread.php?t=213028&highlight=1.8+tranny

 

[fastdsm1]

So .....could I swap the tcu also?

 

[blackbyrd]

Ah, your out of my realm. I went through 20+search pages and yeilded only a couple results and that was the best one. You already have it dropped and ready, you can try bolting it up and swapping the TCU's.. I'm not sure if its just a pin difference, or what..

 

[autonut]

Check the transmission designations that are stamped on the rear of the unit. Look for something like KM-175, or S-Km175, or F4A22, etc. If the designations are the same, then most likely the gear ratios will be as well. As far as the wiring goes, both units should have a pulse generator on the overdrive clutch housing (all the way on the back facing the passenger wheel well) or both should not have one there. If one has the sensor there and the other not, you will have to make mods to get it to work but its possible, Ive done it. As far as the TCU, as long as the wires match up to the unit, the TCU will operate it but keep in mind that the 1.8 program is different than the 2.0 program, so the unit will behave differently with the added horsepower of the 2.0 engine. I am battling this very thing in my galant after going from a 2.0 to a 2.4.