BigBlockJacen
TYF Newbie
- Joined
- Mar 20, 2022
- Posts
- 6
- Reaction score
- 6
ok group, long message incoming
Here is a puzzler for you but hopefully someone has had this happen. I had a new transmission installed last year in my 2002 Yukon with the 4.8l engine and it came with a 1 year warranty from a very reputable shop. A month before the warranty was up...the transmission started having 2 issues. 1) When you reverse out of the driveway, stop and place it into drive, there is a big delay and if you give gas too early, it thumps and jerks you into your seat. 2) The transmission shifts fine from first into second however the transmission will not shift from second to third when over 2000 rpms....under that it will shift fine. I took it back to the transmission shop and they have been great trying to fix it. At first they changed out the servo...no change. Changed out another servo and also the valve body...no change. They kept my my truck for 2 weeks and placed not 1 but 2 transmissions in it and it still did the same thing. They were now confident that it was not a transmission issue. They called a mechanic shop the owner knows that works on GM's and he said it sounded like the throttle body and to send it to him....they are known to cause transmission shift issues. I took the Yukon home and decided to do one thing before thinking of changing the throttle body...I installed a new Throttle Position Sensor on it to see if that might fix the issue....guess what....it STILL does the same thing.....thumps from reverse to drive and will not shift from second to third when over 2000 rpms. I took it to the mechanic shop that was recommended and after a week or so, he told me that everything was fine and it had to be the transmission....he even called the transmission shop back and told them it wasn't the engine.....I am at a loss. Has anyone ever experienced this? I have been down a vehicle for months. Do you all think it could be electrical?
Thanks everyone.
Here is a puzzler for you but hopefully someone has had this happen. I had a new transmission installed last year in my 2002 Yukon with the 4.8l engine and it came with a 1 year warranty from a very reputable shop. A month before the warranty was up...the transmission started having 2 issues. 1) When you reverse out of the driveway, stop and place it into drive, there is a big delay and if you give gas too early, it thumps and jerks you into your seat. 2) The transmission shifts fine from first into second however the transmission will not shift from second to third when over 2000 rpms....under that it will shift fine. I took it back to the transmission shop and they have been great trying to fix it. At first they changed out the servo...no change. Changed out another servo and also the valve body...no change. They kept my my truck for 2 weeks and placed not 1 but 2 transmissions in it and it still did the same thing. They were now confident that it was not a transmission issue. They called a mechanic shop the owner knows that works on GM's and he said it sounded like the throttle body and to send it to him....they are known to cause transmission shift issues. I took the Yukon home and decided to do one thing before thinking of changing the throttle body...I installed a new Throttle Position Sensor on it to see if that might fix the issue....guess what....it STILL does the same thing.....thumps from reverse to drive and will not shift from second to third when over 2000 rpms. I took it to the mechanic shop that was recommended and after a week or so, he told me that everything was fine and it had to be the transmission....he even called the transmission shop back and told them it wasn't the engine.....I am at a loss. Has anyone ever experienced this? I have been down a vehicle for months. Do you all think it could be electrical?
Thanks everyone.