marsmann
01-16-2011, 08:10 PM
ok.
so i have an 02 NBS with a 4L60E. My problem (still) is that it shifts hard (clunk-like) from 1st to 2nd gear ONLY.
It is not mechanical or otherwise - fluid levels are what they should be, fluids have been flushed, shifter solenoids have been replaced, slip yoke has been regreased & packed (along with trying ridiculous rubber ball hacks, etc.), driveshaft is proper, I have programmed my shift points using my hypertech to no avail, etc., even played with line pressures recently but restored everything back to normal now.
My problem has to do with the adaptive learning / memory and table states in the transmission computer. I can clear them at will by slowing down while shifting into 1st or taking off in 1st and this resets the memory / shift points. After that, I can take off in standard Drive (4) and it shifts beautifully for the first few shifts in 1st to 2nd but eventually it goes back to the hard shift after it 'relearns'.
My guess is that even if I swap trannies I will have the same problem since the computer is responsible for the hard shifts. My truck shifts fine when the damn computer is not involved until it learns and injects its crappy 'adaptive' shifting - does anyone know of a way to disable adaptive learning permanently?? I dont need programming of the shift points as I tried that before - what I'd like to do if possible is kill adaptive learning - is there a way I can do it or do I have to take it to a tuner??? I'm hoping for a clever hack such as looping an ohm signal or something along those lines.
Or, better yet can I install an older 4L60E without the adaptive computer from an OBS - I suspect not since the computer will be expecting signals....
Grrr... any help appreciated.
so i have an 02 NBS with a 4L60E. My problem (still) is that it shifts hard (clunk-like) from 1st to 2nd gear ONLY.
It is not mechanical or otherwise - fluid levels are what they should be, fluids have been flushed, shifter solenoids have been replaced, slip yoke has been regreased & packed (along with trying ridiculous rubber ball hacks, etc.), driveshaft is proper, I have programmed my shift points using my hypertech to no avail, etc., even played with line pressures recently but restored everything back to normal now.
My problem has to do with the adaptive learning / memory and table states in the transmission computer. I can clear them at will by slowing down while shifting into 1st or taking off in 1st and this resets the memory / shift points. After that, I can take off in standard Drive (4) and it shifts beautifully for the first few shifts in 1st to 2nd but eventually it goes back to the hard shift after it 'relearns'.
My guess is that even if I swap trannies I will have the same problem since the computer is responsible for the hard shifts. My truck shifts fine when the damn computer is not involved until it learns and injects its crappy 'adaptive' shifting - does anyone know of a way to disable adaptive learning permanently?? I dont need programming of the shift points as I tried that before - what I'd like to do if possible is kill adaptive learning - is there a way I can do it or do I have to take it to a tuner??? I'm hoping for a clever hack such as looping an ohm signal or something along those lines.
Or, better yet can I install an older 4L60E without the adaptive computer from an OBS - I suspect not since the computer will be expecting signals....
Grrr... any help appreciated.