Question Force Tcc Lockup Diesel Place The tcc never goes past 90% lockup. i can command full lockup with the scanner and 90% is it. i can also monitor slippage rpm on the same screen and it increases with 90% lockup as speed increases, as it should. this is a low mile gm goodwrench rebuild that has worked fine for about 2 years now. the tcc has to be pulse width modulated. Try pressing the throttle farther down next time, that should either unlock the converter or kick you down to third. either way, your rpm's will go up and you'll make more power. if more petal doesn't work, use you hand and pull that lever down a notch to 3. shifting into 3rd changes the locking sequence.
Tcc Lockup Mod Diesel Place Question for anyone with a 3500hd truck and tranny knowledge. i own a 1999 chev 3500 hd, 4l80, 19.5 tires, and a 5.13 gear. at 65 mph i'm running around 2500 rpm. pretty high i think. the tcc doesn't seem to be locking up to me, however i dropped it off at a tranny shop and the guys said it was reading it was locking up on the scanner. 6l80e tcc lockup questions. hello guys! new to this board and just picked up hp to tune my 6l80e tcc. i have the "other" tuning software also. i got this software because of better support for this transmission. i have a 2010 gmc sierra 4wd, 6.2l, whipple supercharger, "pterodactyl" 6l80e (alto clutches welded shafts, etc.), 2500 billet stall. 1763 posts · joined 2007. #13 · mar 4, 2009 (edited) the lockup switch was invented so that an exhaust brake would work because when the fuel pedal is in idle position or the brake pedal is pushed the powertrain control module (pcm) will unlock the torque converter clutch (tcc). the tcc can be forced to stay locked by grounding the orange. 2000 4l80e 2nd gear tcc lockup question. i searched and didn't find anything specifically about this question. i have 2000 2500hd with a 6.0l and while staring at the calibrations in hp tuners i noticed gm locks the converter in 2nd gear at nearly wot in tow haul mode. it's set such that a 2 1 downshift can't happen so you are to the firewall.
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