Im having a problem with my transmission shifting... I shortend the shifts and started adding line pressure after installing my stall and new motor... I got a base tune from the repository and started adjusting from there the problem im having is at wide open throttle it wont shift at all and while driving it wont stay in lock up and as soon as you start accelerating it just starts down shifting and slowing down wont hold a gear... just need some help please
BLACK GMC TUNE 4.hpt
erm, im no expert, but your WOT shift speeds show you shifting into 4th at 256kmph, and since youve set WOT TPS to 75% youre gonna be in that table a bit id guess.
plus your shift times are 0.000... id put those back to stock and try dropping down a millisecond at a time, rather than trying to drop the whole lot.
1966 impala. L29 454. 0411 pcm. 2.5" twin system. comp cams XR282HR. ported heads. 1.75 rollers. 60lb deka injectors. bosch 044 pump. standard intake(cos' looks cool in a 66')
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