transmission frustration

[Four0Sport]

few weeks ago somethin funny happened on my way home from work.. i was in drive goin up a steep hill (WV, go figure) on the interstate and my truck seemed to shift kinda funny, not slip but rev a little more than normal in gear. I didnt think anything of it at the time until this past week when it has done the same thing almost every day on my way home from work. Its not slippin though, shifts fine.. only occurs when i kickdown on a hill.. then just seems to be revved a little higher the rest of the way home. if i stop and shut the truck off and turn it back on it returns to normal 4 out of 5 times. After this happened i remembered somethin else that my truck does sometimes. When i start it up in the morning, or leave work.. basically after its sat a while, when i drop it into gear it bogs down and wants to stall and i was thinkin TPS. Could this be the cause of the messy shifting? any feedback would be greatly appreciated. nothin but great advice ever comes from this forum. thanks.

 

[Glacier991]

I know you're giving us your best info, but admittedly it's not a lot to base a diagnosis on. What I am trying to think of is what component of the transmission could account for both, and all I come up with the Torque Convertor CLutch. If you LOST lockup, you'd experience the revving you describe. If you had partial premature lockup at low speed that would also give you the bogging symptom you describe. Yet those are two different things... losing lockup in one instance, and having it too soon in another. Tough one. And that might not be it at ALL ! How many miles on the transmission? and what kind of driving?, fluid changes? filter changes? towing package?, aux cooler ? How does the fluid look? Have you dropped the pan? More info would be helpful. And you are right to look at other inputs into the PCM....more than one transmission has been rebuilt only to discover the problem lay in a sensor somewhere else making to PCM give bad commands to the transmission causing the symptoms.

 

[Four0Sport]

when i first started thinking what could be the cause the torque converter immediately came to mind. the 'revving' problem only seems to occur between 3rd and 4th. as far as the fluid goes, it looks fine, never been low, never smelled burnt, still has a pinkish tint. to answer your other ?s, yes it has an auxillary cooler.. 132k on the truck, ive had it since 84k and in the 2 years ive owned it ive never changed the filter.. always been paranoid hearing stories about tranny's going out after theyve had a filter change. thanks for the help, if anything else comes to mind id be glad to hear it