2004 4l80e hot trans on hills
Hi my 2004 k2500 transmission gets up to 230f on any grade locked in 3rd gear and not gear hunting. Why is it getting that hot on hills?
Forum Discussion
My guess is that it might be in 3rd gear and you may even have the gear shift set to "3", but the TC is running 'unlocked' to be able to hold your speed??
One way to tell is while you are climbing the grade, give it some throttle and if the rpms rise a bit (couple hundred rpms), but you don't gain any appreciable speed, the TC is unlocked. If you do that and the rpms don't move and it sounds like you are bogging the engine, then it's locked.
My old 97 F150 would do that at times in either 2nd or 3rd gear. If I was in 2nd and it was unlocked, if I put the pedal to the floor, it would lock the TC and I could see the trans temp go down as I drove the remainder of the grade. If it was in 3rd, it would simply downshift to 2nd because I don't have a "3" on the gear lever (it was D, 2, 1).
Good luck!
Mitch
One way to tell is while you are climbing the grade, give it some throttle and if the rpms rise a bit (couple hundred rpms), but you don't gain any appreciable speed, the TC is unlocked. If you do that and the rpms don't move and it sounds like you are bogging the engine, then it's locked.
My old 97 F150 would do that at times in either 2nd or 3rd gear. If I was in 2nd and it was unlocked, if I put the pedal to the floor, it would lock the TC and I could see the trans temp go down as I drove the remainder of the grade. If it was in 3rd, it would simply downshift to 2nd because I don't have a "3" on the gear lever (it was D, 2, 1).
Good luck!
Mitch
