Trany bucking part throttle uphill?

[orion_134]

My dad's truck is doing the same thing, F150 with 180k. At part throttle at the top of 3rd (maybe 4th too, can't remember), if engine speed starts slowing down the truck will start bucking. It stops if I motor on, let off the gas, or shift into a higher gear. Just flushed the tranny with Dexron III/Mercon, so I hope that will help, but I was wondering if I'm on the verge of going through a tranny...
Thanks in advance,
Jesse

 

[JLDickmon]

dude, ya gotta tell us if it's engaging and dis-engaging, hunting through a couple of gears, or just plain bucking...

first check your fluid level...

almost sounds to me like you got a bad set of plugwires (part throttle, moderate load)

 

[orion_134]

Diesels have plug wires? New to this diesel thing... It isn't engaging, just bucking, rpm stays about the same.
Jesse

 

[95_stroker]

Diesels have plug wires? New to this diesel thing...
Jesse

Uhhh no, diesels dont have plugs or plug wires. But your original post talks of an F150 with a bucking tranny.

Let us know what we're fix'in and we'll try to help you.

 

[orion_134]

My dad's truck is doing the same thing, i.e., as mine. Guess I should have clarified.
It's my 250 that is malfunctioning.
Thanks,
Jesse

 

[JLDickmon]

OK... we have two tucks with the same symptoms, but one is a gas the other a diesel engine?

 

[orion_134]

Sigh, yes, I was just saying that to eliminate engine problems, I've heard it's common with older Ford trannies.
Jesse