find a shop with a tech 2 scanner, and get him to go for a ride and scan while its happening. he should be able to look at all the sensor outputs while driving and hopefully see one thats acting crazy.

 

Same size tires all the way around..

We going to try the tech 2, but I'm sure the speedo is telling us where the problem is at. I think we going to try the vss off my truck & pull the tail housing again & inspect it alittle closer.

Thanks for the help guys.