Quote:
Originally Posted by KingLT1
I believe some of the issue is the converter unlocking. When I tuned my trans to not lock the converter until 8th gear part throttle the issue went away. This is how they should of came from the factory being it's easier on the converter and much smoother driving. The downside is it lowers fuel mileage...and is the only reason why GM programs the converter to lock up in the lower gears. Sometimes the converter will hang on too long while locked and jerk when you slow down or round a corner. I also believe some of it is related to what Jax Chris mentioned, but I do know changing how the converter locks seems to have eliminated the issue for me.
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Yes not allowing the TC to lock when braking fixes the issue. I guess allowing the TC to be unlocked lets any bind up to just spin the TC backwards without reversing the whole driveline and have it bump and clank. I guess this shouldn't be much of a problem if the 8L80 shifted better but I think on especially the 4-3 it is engaging the oncoming clutch to fast and causing it to bind up and reverse for a split second. Its funny that if you brake a little harder it dosent do it and same goes for if you just let it coast to a stop without the brake. Hopefully if I can get a unlocked TCM hp tuners has the ability to force the TC to unlock during downshifts since I like the TC being locked while crusing. I also wonder if the TC is locked during part throttle upshifts as well and if we can force it to unlock during upshifts to get better shift quality.