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mine was due to a discrepancy between the MAP and the BARO sensor. it was also very random, i could be driving fine for a month and would act up for a week suddenly. week after that fine again, two days later bad again. i even had it switch back and forth 4 or so times within a 150 mile trip and everytime i got close to a shop with a scanner it was driving fine. after a few months of driving to shops only to run perfectly when i pulled up i just deal with it. i have learned how to drive so you don't notice the hard shifts, and when its acting up in the middle of your drive.
when i shift from park to drive the truck would jump a little and when i was stopping if i noticed the downshift from OD to 3rd was rough then it was acting up and adjust my acceleration. a few things i did to lessen the hard shift:
accelerate slowly (might be hard for some and annoy other drivers)
don't let the TC lock up until it shift to OD or 3rd with OD off ( watch trans temps. they seem to run hotter when shifting hard)
if i was in third and the TC locked up before i could get into OD i hit the off button let off the accel for 1 sec re-accel, then turned it back on. (only works from about 50 to less)
overall best advice posted was to get it tested to pinpoint the problem and fix it. after a year i was able to get it tested but at what cost to the trans? I've noticed the harsh shifts are no longer as bad as they use to be, so i'm sure i have some extra wear on my clutches.
edit: i didn't have a flashing OD light just similar symptoms
Last edited by husslr187; 04-23-2014 at 10:22 PM.