I HAULED A LOAD OF WOOD THE OTHER DAY AND ALL WAS FINE.THE NEXT DAY I WAS DRIVING DOWN THE ROAD AND AS I WAS GOING UP A HILL AT ABOUT 35MPH THE TRUCK ACTED LIKE IT WAS TRYING TO FIND THE RIGHT GEAR.ALMOST LIKE I WAS STOMPING ON AND OFF THE GAS.THIS LASTED ALL OF 5 SECONDS AND THEN DROVE ALRIGHT BUT IT DOES NOT FEEL THE SAME...ANY IMPUT OR TROUBLE SHOOTING ADVICE???THANKS

 

35mph is about when mine tries to shift into overdrive, but your case sounds a little more severe.

Fluid level OK and tranny filter not plugged? Beyond that, I'm at a loss.

 

I Did Check The Fluid Level It Was Good.as For The Filter Being Plugged.i Guess I Need To Drop The Pan And Change It.what Would Cause It To Plug?.....do Tranny Problems Usually Come Out Of Nowhere Or Do They Slowly Progress?.....what Work Have You Had Done To Do To Motor And Tranny?i See You Have 208k On A 5.0....thanks For The Response

 

Has the tranny been serviced regularly? If not then its time for an overhaul. If so drop the pan and see what ya find.

 

I think the tranny filter catches the clutch wear and any other component wear trash/shavings.

Trannies can go any number of ways. If it's a slow death, one may not pick up on the changes until they become severe enough, or until the vehicle is driven harder/different than normal.

If this is the first fluid/filter change - there will likely be a plastic bobber-looking thing drop out of the pan. I mention this because it really freaked me out - didn't know what it was, what it did, or where it came from. Found that this was a plug used to seal the dipstick hole, and when the dipstick assembly was installed, this plug was just pushed into the transmission to be removed at the next service. Whew!

Also, if you're going to do this yourself, be careful not to overtighten the pan bolts - they strip really easy.

Other than routine maintenance on mine, the things I recall are:
Motor -
* replaced valve stem seals,
* replaced air intake plenum-to-manifold gasket,
* replaced intake manifold gasket - while I was at it, checked the timing chain, getting close to, but still within tolerance - went ahead and replaced it.
* ignition coil,
* TFI module on the distributor,
* water pump,
* fan clutch,
* PCV valve,
* EGR position sensor,
* EGR control solenoid,
* coolant temp sensor,
* TPS sensor.

Transmission - no work other than fluid and filter changes.

 

I BOUGHT THE TRUCK A FEW MONTHS BACK WITH 144000 MILES AND DONT HAVE ANY MAINTENANCE RECORDS.WHAT SHOULD I LOOK FOR WHEN I DROP THE PAN(WHAT MEANS TROUBLE)?

 

I GUESS HAULING THE WOOD MAY HAVE BROUGHT IT OUT.

 

If that thing is in the pan its never been off. Other than that if there is an excessive amout of black goo in the bottom of the pan that is clutch material and tranny fluid. Look at the filter, take it apart. Look for metalics in the fluid.