pwrtrip75

iTrader: (8)

Got a TH350 in a 99 formula LS1.
Got the speedo part numbers from here
https://ls1tech.com/forums/automatic-transmission/197642-what-would-you-like-see-addressed-th400-faq.html

Those part numbers are for these
VSS Sensor GM#8655291 and the Relutor ring GM#8655315

Theres no way that sensor will fit in a TH350 the hole would need to be 3 times bigger, and the relucter ring is way too big...made for a 400.

Can someone delete where it says th-350 in the sticky so no one else buys this thats specifically made for a TH400 and is not interchangeable. And will NOT work in a TH-350.
And does anyone have the RIGHT part numbers?

8a8mfh

iTrader: (3)

I don't have the part numbers but you need the reluctor wheel off a 700R4 with an elec speedo. There are long tail '88 up to 19?? th400 with the same smaller reluctor wheel.
The problem with the sensor fitting is you need a short BOP (Buick, Olds, Pontiac) tail housing. The BOP housing uses the big hole. There is no long tail th350 that I know of that uses the big hole.
EDIT....IIRC the th400 sensor is about 1/8" smaller in diameter than the 700 sensor.

Agt. Orange

I think we got it now.For the th350 you can get A BOP tail shaft(short).And the speed rotor off the 700R4 will work and the speed sensor. I read the sticky and got what they were all saying to get and its not right well I only lost 220$ for the wrong parts.