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Looking for a little help. I recently had a transmission code after the truck started holding onto 2nd gear and slamming into 3rd while running my TS 6 position on the 50E, 75T, or 100R settings. It shifts smooth on stock or 140. I had the codes and and it showed SS1 and SS2 solenoid failure and I replaced the solenoid pack and still have the same problem. I have read many forum post over the last few days and read a good bit about guys having having his same problem and most are pointed towards replacing the Valve Body. But none of them I have stumbled across say anything about what they actually did to correct the issue. I was going to get the John Wood Valve Body (since it was already recommended to be ran with programmers) but wanted to try and get a more straight answer/idea before I spend more money and end up right back where I am now. This is a stock 4R100 tranny as well. Thanks in advance.

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Looks like total rebuild. Took the truck to a tranny specialist and come to find out when I bought the truck in march 2012 the previous owner fried the torque converter and had it masked by a ghost program on the pcm. Once I installed my TS it started showing its ugly face when it had the increased power sent through it. Torque converter was locking as it went from first to second and dropping second gear starting rpm to around 1000-1100 then causing the hard slam from second to third due to the TC being locked. Do to this issue going on for and unknown time it caused failures/severe wear all through the tranny. Just an fyi for anyone who may run across a similar issue in the future. I'll add in all parts we replace once we get everything done. She will be built after we are done since everything is getting dumped out and pretty much starting from scratch internally.

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Mine will do that if I leave the tc locked manually. the tc is supposed to unlock between shifts I think

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