98 2500 suburban 6.5/4l80. about two weeks ago the speedometer started acting funny (the gear selector indicator light would turn off and the spedo and tach would go eractict), now the shift indicator light dosent come on at all and i only have 2nd gear wether in D 3 2 or 1. park neutral and reverse work fine. i thought it might be a connection at the side of the transmission because i have a pretty bad oil leak at the rear main seal and all the wiring is covered with oil and road gunk, so i cleaned all of the connections but saw no improvement. from what im reading here it sounds like i should be looking for an electrical problem further from the tranny its self. i will be sure to post the answer to my problem as soon as i figure it out.

 

im sure theres some guys here that can help you out, good luck.

 

Had a problem like this in my tool truck. Un-plug teh computer for the tranny and plug it back in and you hould get the gears back. Mine was a blown heat sink in the computer that causes the tranny to go into limp mode (2nd gear only). Also there is something to do with teh ignition switch not getting power to the computer or something that was the other thing the tech and G< told me to look at. Cant remember what it was exactly though but know it was something to do with th ignition switch.

 

Welcome to the site

 

 

Thanks for the info, can you clarify what and were is the tec ignition switch.
thanks murrayg

 

Welcome Murray - I hope we can help you with your tranny. Please feel free to post this in the GM section, as more people that can help you may see it there.

 

 

Welcome to DB