Join Date: Dec 2006
Location: Spring Hill, FL
Thanked 45 Times in 41 Posts
iTrader Score: 0 reviews
i did it ALL except buying a noise filter from an aftermarket source
Remove engine harness and install braided noise sheilding on TPS wires from TPS to PCM and on Trans control wires from Trans to PCM. (this precludes the need for a noise filter since the braided sheilding prevents the noise from entering the wires intially)
Ground PCM case w/ 8awg fine-strand cable to negative battery ground
Replace Ground cables on battery
Replace Gov Press sensor and Gov solenoid
Replace trans fluid and filter
Replace Output shaft speed sensor
my Gov sensor/solenoid were faulty and that got my PCM out of limp and allowed it to shift normally. however, nighttime driving made the TC lockup, OD/D shifting problem apparant. i knew it was dependant on electrical load since it only happened at night, when running the lighting increased the Generator load dramatically. turns out the brush in the generator was worn down to the shoe and was arcing out on the armature. this acring created RFI which was introduced into the harness and the PCM via inductance. replacing this brush (even though my truck produced 14v while running and showed no evident signs of failure) solved my shifting problems 100% . my truck is now shifts as strongly, predictably and reliably as it did when it first rolled of the Lot.
Moral of the story; REBUILD YOUR GENERATOR FIRST, before buying ANYTHING else.
2001.5 3500 Laramie, qclb, 4wd, drw auto, goose, AirRaid
Last edited by flubyux2; 09-15-2007 at 01:49 AM.