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 I think this is just a newer version of the T125.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.

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.