Hello to all. I really need some help. My 1996 GMC Sierra Truck (4.3l Vortec) just all of a sudden just decided to not shift. The shift lever (This is an automatic) shifts fine when the brakes are depressed, no problem. But while shifting to any gear, nothing happens. The engine sound does not change and I can tell that the transmission is not at all engaging. So it seems that the problem is happening before the transmission since the transmission is not being told to shift. Again, no difference in engine noise and no sounds are heard when shifting, and the idle speed does not change. I checked the cable connected to the transmission and it is fine and all electrical connectors are connected. By the way, the cable that I saw coming out of the transmission is actually feeding to the back of the truck. Am I missing any other cables. I checked the transmission fluid level and it is fine. What else can it be that would be causing this issue to happen. Are there any fuses that could cause this to happen if blown. It drove fine when it was last parked and now it does not. Any help would be greatly appreciated and I would like to thank you in advance. Stacey
1996 GMC Sierra shifts but nothing happens
- Thread starter invest0rs
- Start date
So, not that anyone helped me but I will give you an update anyway. It was the Torque converter. Actually, the torque converter was fine. However, the 3 bolts holding the torque converter to the flex plate was not. One was missing (backed out), one was sitting in the bottom of the bell housing (backed out), and one bolt sheared and was left in the torque converter. No telling where the head of the bolt is. It looked like the flex plate walked about a 1/4" around the torque converter. I would guess from the looks of it it has been pretty loose for quit a while to have done this damage. Has anyone ever seen this before. And there has been no work done on the transmission or torque converter.
Attachments
I haven't had that torque converter bolt problem in my GMC Sierra, but I've encountered it in three other vehicles over the years. A related problem is a cracked flex plate , where the torque converter attaches . The crack can cause a knocking sound that may sound like a rod knock .