2000 F150, V6, 103,000 miles (Getting No Codes)

I had the Tranny replaced about 60,000 miles ago.

I've had the transmission shop look at the tranny and they say it's working fine. They say i have an engine problem.

Basically the trans shifts really hard when i first start the truck. If I let it warm up before shifting into drive it won't shift hard. If I don't let it warm up and just shift right away it slams into gear.

Also after it heats up or it's really hot outside the 1-2 shifts hard sometimes. Other times it shifts fine. Strange.

When I gun it and it's warm it will hang and not shift into gear for a second kinda like it's not understanding when to shift right.

If I'm on the freeway and I gun it sometimes not always it will rev high then down shift into all the higher gears kinda quick.

I've done so much reading I'm kinda sick and can't seem to pinpoint what the problem might be. Most of the time it shifts fine just happens at different times.

I've come to the realization that if it's not the tranny, been to 2 shops, I guess it must be the engine.

Some of the things I've been reading are, TPS sensor, EGR valve, reflash PCM, PFE sensor, maybe vacuum hose.

I don't really want to replace all these to trouble shoot so i came to ask the experts.

If anyone has any suggestions or similar problems with success's I would appreciate some help.

After the hard shift in the mourning all is good when it's cold, seems to happen alot more when it's hot outside.

And if you think it's still the tranny let me know.


Thanks,
Chris