So the 4L80 in my HD started acting up. Slipping alot, and it wasnt just converter slip. well it started getting so bad i had to take it in. They dropped it out of the truck and were completely amazed at what they saw. There were fibers they said were from the tcc shoved up in the valve body, and some converter material shoved up into the shaft seals and made them go into an egg shape. also the clutches were burned up and some 'shifting fork' was screwed up they said. Also they said that the transcooler was plugged up with the debris from the converter. What they said they're going to do, is replace the t-con with a super heavy duty one, install a shift kit, and put some good stuff inside it.
My question is: How the hell did i mess it up THAT bad with a totally stock engine, except for plug wires? Ive been using russ K's trans tune. Only thing i modded in it was taking out TM, because everyone said you can do it on an 80.
Also, when they do the shift kit in my 80E, will they be able to make it not shift neckbreakingly hard in the VCM? Id only like that to be in my tow haul mode like before. Im not familiar with shift kits too much, so if thats just a retarded question, then ignore it. I just dont want to be driving along in the wet under light throttle and get any sideways action going into the next gear.
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Hey, j/k here!! 
Originally Posted by EC_Tune
