I have a 2000 F-150 XLT 5.4 2wd, Transmission has no problems when cold, but once i drive for a while and it warms up, reverse stops working and it slips when shifting gears. Once warmed up and shifted into reverse, it takes up to 3000rpm to make it slam into reverse and then it shudders the entire time. It will not down shift when passing slower cars either, only a loud clunk and it stays in the same gear. It hesitates between shifting also. It seems like if something was broken inside it would work at all. Right? a quart of Lucas Trans additive helpled the sitiuation for about a month, then slowly stated again. Whats the deal?

 

Sounds like it's time for a new tranny. If the OD light is flashing, get the codes read with an advanced scanner (not an autozone special).

 

It sounds like you might have a problem with something internal where there is too much clearance and when the fluid gets warm and thin you lose pressure. Not sure about the downshifting issue though.

Darrin

 

No overdrive light flashing. This is the fourth transmission put into this truck and they all seem the break rather quickly. I just bought the truck, kinda screwed i guess. It still pulls hard though, just slips shifting.

 

Yup your losing line pressure somewhere in there...be prepared for an overhaul or replacement soon.