Nsjenner

Everything was done under warranty since I did the entire transmission swap so if nothing else is found to be causing the problem I’ll be putting a billet unit in for sure. Any recommendations on brand or exact type? Engine and driveline is stock so mainly looking for something thats just going to last until I retire the truck. Hoping to get another 150000 km on this truck before I get rid of it.

This is a work truck but it doesn’t pull anything. The last torque converter only lasted 15000 km and this was all highway and city driving with zero hard use. Only weight I have in the truck is a rat pack box with about 400 pounds of tools and the truck just has a leveling kit with 33” tires so there shouldn't be any excess stress on the driveline. Heading to the dealer tomorrow to see if they have any ideas.

Just using factory converters but I’m think there has to be something else going on? The last failure was only 15000 km of city and highway driving and the original converter lasted 215000 km. After the second failure I did ask the shop about what was available thats completely overbuilt but they stated that it was just a bad converter from the factory. Just seems really unlikely that i got three bad factory converters in a row.

Looking for some advice from the experts. Truck is a 2013 gmc 2500HD with the 6.0l gas and the 6L90 transmission. Original transmission had a torque converter fail at 215000 km and I had a reman transmission installed. Torque converter failed again after around 20000 km and the shop installed another reman transmission under warranty, torque converter failed again in roughly 20000 km and a second warranty transmission was installed. After 15000 km the torque converter has failed again. The transmission shop is completely stumped and they are regarded as the best place in the city to get transmission work done. Really don’t know what to do next but there has to be some other problem thats causing the issues. The only idea the shop can think of is something strange going on with the computer thats causing the issues but each time the computer reprograms fine and seems to be operating the way it should be while running a live data scan. Transmission temp is always in the normal range with no other issues on the truck other than having the stabilitrack sensor replaced when I got an alignment recently. Any ideas on where to look for the underlying issue? I don’t want to dump another transmission in and have it happen again.

Thanks for the reply, been so busy with work that I missed the notification. My original thought was the torque converter but the transmission fluid was still clear and the temperature never went above normal levels so I put this out of my mind at the start. This definitely makes sense though since the vibration sound almost sounds like bearing howl, probably the needle bearings in the converter. I'll be booking the truck in tomorrow to get this confirmed and then changed out. Thanks again!!

Hopefully I can get some help here on an issue. Truck is a 2013 gmc 2500HD Denali with the 6.0l Vortec, I started getting a small vibration when maintaining speed at anywhere from 60km/h to 100km/h. The vibration will start and stop at random and at the same time I can watch the rpm go up by roughly 100 while the vibration is happening, after the vibration stops the rpm will drop back to its normal position. The vibration will immediately stop if I let off the throttle or if I press the throttle further getting it to drop a gear accelerating, it seems to only happen under a very specific engine load. Also the vibration is stronger if the truck is in 4wd. While the vibration is happening if I open the rear sliding window it sounds like the vibration is coming from the exhaust but this could be the sound just bouncing off the inner front panel in the truck bed and being redirected up to the window. I have had the truck at a mechanic and initially he found on the scanner a completely random misfire happening across all cylinders so to start with I had the plugs and wires changed and also had both diffs, t-case, and transmission all serviced. At the same time they inspected all u-joints, cv's, and wheel bearings. The mechanic could find nothing that would seem to cause the issues and he is currently stumped. I have the truck back for now and the problem does not seem to be getting any worse but obviously want to find the cause and get it fixed. The truck currently has 216k km's and other than a water pump replacement this is the first major issue. I have read about similar problems on the forum but nothing that matches my exact issue.