Hello, new to the board but no stranger to toyotas in general. I do have a 6g celica but i gave it to my dad as a DD, my real car the 3.3L 2nd gen MR2

Anyway skipping the quick intro, i need to find out if there is a difference between the ATM and MT speed sending unit.
I know part numbers are different but is there any physical difference on the housing/body?
Reason i ask is im trying to install a speed sensor into a gear box which never had one and the design of the S5 gearbox is similar in shape to the closed socket hole in this new transmission project.

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V5 (the 3 pin connector); vehicle speed sensor is the same on the transmission side. The reason it pulls up different for is the other end of it that plugs into the ecm and the way the actual sending unit seats on the tranny. All it does is see how fast the drive axel spins iirc so there isn't any mechanical difference.

Tl;dr- Plug it in and your good to go.

This post has been edited by travisxcore: Oct 20, 2012 - 9:54 AM

Thats where im not to sure on anymore, the gearing code is different.

Speed sensor markings
ST204 ATM N=23, Mark 23:27
ST204 MTM N=21, Mark 25:21

Differential speed gear marking
ST204 ATM N=25
ST204 MTM N=27

Sure you can drop it in but the reading will not be correct

I dont see how your axel could spin any differently w/ an at or mt especially when the axels are the same...unless it doesn't measure the drive axel but something else, in which case I can't help you. I'm scrapping my auto so i guess i could tear into it and try to see how it works.

axle speed doesn't determine speed, it's calculated with the tire diameter. the combination of the gear pitch will have the final say if it's accurate or not... Look like i'll have to stick with a MTM setup just to keep it consistant