my auto tranny in my 99 5.4 shifts into and outta o/d mighty wierd. it will do it one out of prolly every 5 shifts. it basically sounds like im running over a rumble strip for about 2 seconds. i have recently had the tranny flushed, fluid and filtered. i had the problem before and after the tranny flush. could this be an electronic problem. i have no lights flashing. the tranny also shifts hard too. my thinking is its on its way out, just a matter of time. is there anything i could do to check on it.

thanks josh

i have been reading this forum for years and this is my first post

 

Welcome ya lurker!

Whats the mileage? Tranny code from the door jam sticker?

Adrianspeeder

 

140,000, not sure about the code on the door. i have looked for it before but wasn't sure what i was lookin for. i have been told that a failing electrical part would possibly cuase bad shifting and that rumble strip feeling.

josh

 

Regular fluid changes are essential for transmission longevity.

 

Yer lookin' fer a U or E underneith TRANS or TR.

U = 4R70w
E = 4R100

Adrianspeeder

 

Heres a couple of pics of what Mr Speeder is refering to

 

I have had the same "washboard" problem with my 98 Expedition (4.6L). It goes away after a flush & fill and is fine for about 20K miles. I'm told it's caused by fluid breakdown and you'll feel the rumble when the torque converter goes in & out of lockup. For me, it was noticeable with OD on and off.

 

rickyrocket same story for me. what did you do to fix the problem. replace the tranny???
ill get the code later today and see if that would shed any light
thanks for the replies
josh

 

the sticker says U does this help any at all???

thanks josh

 

The U means you have the 4r70w tranny, the weaker of the 2. Same tranny I have and mine went out at 100k. Good luck

 

I thought for sure you would have the 4r100 with the 5four L - That must have been in the tow package only that year .. Oh well ..

Good luck to yuh

 

I have a 97 F150 4x4. The torque converter slips when locking up. It happens more often when it locks up in OD, but sometimes does it in 3rd aswell. Is there a way that I could interupt the solenoid that enables the the lockup feature with a toggle switch. Im sure that my transmission wont heat up too bad just drivng around town, and if I go on a long road trip, I will enable the lockup once I get up to speed. I just need help identifiying the wiring.

Thanks!
Joe

 

Haven't had to replace the tranny because the flush & fill corrects the washboard problem for about 20K miles. Good luck bud!