I picked up this NOS 125 transmission but im not sure if its a fiero specific transmission as some things seem off, like the connector for the Speedo sensor below. also the second pic is the stamp code on the transmission.

I don't know the answer....bump.

My research shows hat this speed sensor is the updated version from 90s T125 used in 3.1 gm applications. I think this is just a newer version of the T125. the connection looks to be the same.

I'm still at a loss, all my searches have come up dry. here are some more pics of the serial numbers etc. I really would like to figure out what car this was for as the T125 has alot of different applications all the way up to 1999. Used different final drive ratios as well.

[This message has been edited by jjd2296 (edited 01-15-2022).]

BUMP I know there is someone here on this forum that is knowledgeable enough to help out here

All I could find so far.
PN 8666413 is only the case part number.
Is there any number on the bottom pan?

TH125C Service Manual
"C" signifies the lockup Torque Converter
https://shop.ukrtrans.biz/w.../catalogs/TH125C.pdf

Available gear ratios
http://web.archive.org/web/...~fierocave/ratio.htm

Canadian Built in Windsor
On 1st Shift of 151st day of 1993



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[This message has been edited by fierosound (edited 01-17-2022).]

thanks! thats a good start for me. There is no sticker on the bottom of the pan thats why I couldnt figure it out. Now i need to see what cars these were going in in 1993, I think mainly the GM vans as they were built in oshawa I belive.

Is the bellhousing a metric V6 bellhousing? (useless if it's for Ecotec/Quad 4 etc)
Any more info from the place you got it from?



I think this may not be compatible with the Fiero.
You'll need change it to one from a Fiero tranny.

The PN cross references to these vehicles:
So the trans most likely come from one of these, hopefully with a V6.
https://www.thewrenchmonkey...uto-parts/bwd/s8304/

[This message has been edited by fierosound (edited 01-17-2022).]

I thin I have a 85-86 auto trans ratios: 2.84 1st, 1.60 2cond, and 1.00 3rd with a 3.65:1 final drive. that is the same as the 90's pontiac transport vans as well. this should be good for my swap.

quote Originally posted by fierosound: Is the bellhousing a metric V6 bellhousing? (useless if it's for Ecotec/Quad 4 etc) Any more info from the place you got it from? I think this may not be compatible with the Fiero. You'll need change it to one from a Fiero tranny. The PN cross references to these vehicles: So the trans most likely come from one of these, hopefully with a V6. https://www.thewrenchmonkey...uto-parts/bwd/s8304/

It’s metric. It’s stamped on the pan. I’m sure this is a tranny made for the transport vans. I’ll look into the speed sensor.