I have been researching my problem with my tranny in my truck and I think I have it narrowed down to a faulty TPS or an Imput Speed Sensor. I have a 99 Chevy Suburban 2500 454 4X4 with a 4L80E. HARD shift from first to second. I know the TPS is located next to the Valve Body and the Imput Speed Sensor is on the outside of the tranny about 8 in from the bellhousing. Can anyone help me with locating them and how to replace them? Thanks!