Our 98 k2500 454 with a 4l80e trans was sent to the dealer for software updates , for the new computer - ecm - pcm, when it came back it does the same thing. That was 20,000 miles ago.
At the time I questioned the dealer they said it was because originally the trans shifted into OD too late and would overheat the trans on the road when pulling light loads , up to 1.5 tons. So GM ,in all thier wisdom, changed the calibration.
It's not the lock up that is not working it is 4th gear that doesn't engage until high speed.
By the way say good bye to decent fuel economy.
Joe
This post was edited by redblood at 13:05:15 06/03/09.
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