Sonnax has a Billet Front Twin Disc kit.But it's NOT cheap, Especially when added to a already very expensive job where the Pump, Stator & Coolers need to be replaced at bare minimum beyond all the Soft Parts that normally get replaced during a rebuild. I believe GM was chasing Fuel Economy by providing barely adequate TCC apply pressure & was chasing reduced NVH with the constant TCC slip in V4 mode that's more aggressive than was calibrated in the AFM GMT900 platform.īeen talking with my Converter builder about adapting a TMBX 300mm 4L60E Converter to fit in place of a JMBX 300mm 6L80E Converter, There are just enough differences where it's not financially feasible to train his staff & convince other shops to spend $70 more per converter when a rebuilt JMBX will make it through warranty. He is a VERY aggressive driver that likely uses 3/4 to full throttle more than I've ever seen! The TCM ramps up TCC apply pressure almost linear with Calculated Applied Torque. Interestingly enough I had the original converter cut open & no discernable wear was found. I have one customer with well over 200,000 on his 2015 Silverado.But I installed a Billet Front Twin Disc Converter preemptively. I'd like to know how many K2XX truck owners we have here with over 175,000 miles on their original 6L80E? GMC Sierra 2500HD/3500HD 6.6L80E Torque Converter failures on K2XX platform (2014-2019 GM Truck) have skyrocketed & will eclipse Converter failure rates in GMT900 platform (2007-2013 GM Truck) by a huge margin. If you have questions, contract our resident expert, Arash at 403-XXX-XXXX or use the email form below.Ĭhevrolet Silverado 1500 5.3 (ext. We can solve this for you at the root, so you’ll get a lot more use out of your vehicle without throwing money at the problem. We believe that you should only replace the entire thing if you have no other choice, because a brand new OEM transmission will likely have a similar issue. National Transmission works with local fabricators to create replacement. We also supplement the fusion welds in the the drum with spot-welds, which are then machined flat to maintain rotational and harmonic balancing, while also greatly increasing the structural strength between the two pieces. We install a “billet” base to the Torque Converter, which is machined (not welded), which prevents warping and additional friction on the clutch. The National Transmission solution to fixing GM 6L80 and 6L90 Transmissions? That said, there are warning signs to be aware of including slipping, missing gears, shuddering, vibrations, weird smells and loud clunking noises. You’ll notice the moment of catastrophic failure because the truck will suddenly not move under its power. How do you know when the transmission has failed? The additional friction inside the pump from oil shavings cause it to fail, leading to a lack of lubrication inside the transmission, which breaks the whole system. What is happening to the transmission and how is it starting to fail?īasically, General Motors had decided to increase the manufacturing efficiency by cutting corners on welding, and by using too thin metals, which ultimately cause rotational balance issues, which lead to premature wear of the clutch – the clutch wear produces metal shavings, which get caught in the oil pump. Watch the full 6L80 and 6L90 Transmission Teardown and Repair Video The good news is that these transmissions have come through our shop 1000s of times, so we are able to fix the root causes before they cause catastrophic failure. If you’re not overly ‘mechanical’ but you think you might be impacted by this issue.
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