95 GMC Truck Transmission, 5.7 Motor
It sounds like the engine and transmission needs to be recalibrate to one another. I good transmission shop with a tech 2 scanner can fix this if it's not a mechanical problem. Here is 101 transmission in a few words that i hope can help you. The Throttle position sensor (TPS) sends signals to the ECM and calculate with the transmission turbine sensor (VTS)the amount of transmission line pressure which is controlled by the transmission line pressure servo. The pressure line servo controls the firmness of the shift and the TPS with the VTS controls the shift points. If the ECM is not calibrated or a senor is reading bad your going to have problems with the transmission like you have and will have a major failure within 6 month due to burnt clutch packs, so check your transmission fluid for leave and condition. It should be bright red and not dark like burgundy which would indicate burnt clutch packs. If there is a good transmission shop or you have warranty on your transmission, have them do a transmission line pressure and scan the ECM for any DTC codes. IF your out of warranty, find a good speed shop who can read and reprogram your ECM so you can have your engine and transmission running 100% Good luck and hope this helps.
Jul 06, 2009 |
GMC Sierra 1500 Cars & Trucks