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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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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