518 Shifts Weird

[Lordsman]

Whats up with my transmission? When cruising along it just starts downshifting from OD back to third (back and forth). Will stay in OD with my foot on the go pedal but when I let up it downshifts again. Never did this before. This transmission is new (15,000 mi. ), with a DTT torque converter and Superior shift kit. What do I check for? Fluid level is correct, truck is a 1993. Thanks.

 

[Withers]

check a few posts below this one, "trans kicking in and out of od", same problem, seem's fairly commen.

 

[RDusch]

Lordsman

Sounds like the Throttle Position Sensor, it's a pretty common problem, i went thru 2 in the first 100k but the last one i bought looked different and has been working great for another 100k



Rick