Right Speed Sensor Buffer?

[NastyStrontium]

I had my transmission rebuilt last year and my mechanic said my speed sensor buffer needed replacement, but he couldn't get one in, so he bypassed it with a pressure switch I believe.

I want to have cruise control and I've been having a ton of problems with my torque convertor locking, or staying locked, and just want to put in the buffer. He said it's a specific one for Grand Nationals only.

Not sure if he's right or not. I have an 87 Grand National. Is this the right one to order?

http://www.nos4gn.com/servlet/the-172/Buick-Turbo-Regal-Grand/Detail

I think I can post that link here

 

[turbo nasty]

The Speed sensor....Thats in the back of the speedo head.
Does your SM show MPH?
If so then the Speed sensor is good
If you are missing the 2 spsi switches that are in the BRF valve body for 3 and 4th gear then the ecm will not know the car is in said gear.