Overdrive problems

Hello, just wandering if anyone has had the same issues as mine . First i've got 99 4x4 extended cab with 5.3 . so here it is when the truck starts warming up driving down the road it starts shifting in and out of OD , took it to dealer had complete flush preformed helped for 10 miles roughly. 60 mph OD in 1600 rpm OD out 1950 rpm . Any thoughts

I think I've heard that this can be caused by a bad torque converter, but I very well could be wrong here. Anybody else?

:swear:

I think that you are falling in and out of TCC lockup (not in and out of 4th gear).

It can be the torque converter but sometimes it can be the TCC Apply valve (http://www.transmissionspecialty.com/parts/parts/77805.htm) which can be fixed without removing the tranny. The valve body does need to be removed.

//2000CAYukon

Thanks , just wandering would a transgo kit fix this also . Extra info when it drops out of OD a quick throttle burp usually puts it right back.

Thanks , just wandering would a transgo kit fix this also . Extra info when it drops out of OD a quick throttle burp usually puts it right back.

It needs proper testing with a engine/transmission capable scanner first to find the problem.
May even be a engine running problem.
Post back codes or transmission and engine sensor readings.
MT