Transmission problem

[budkuhlmann]

Okay, my 2000 f150, not sure what trans it has... When I'm driving, in town or highway, the truck shifts hard and the tranny squeals. Any idea what the issue could be?

[BFEB]

Has the tranny been serviced within the last 50,000 mi? If not the first thing I'd try is a filter and fluid change.

[budkuhlmann]

I serviced it when I bought it last year and I'm coming up on 50000, so I'll do it again. What if that doesn't fix it?

[bigred5.4l]

Before u change the fluid make sure it's a darker color if it's not don't waist your time, shifting hard could be a speed sensor, or if it only happens when your putting stress on the trans ( going up hit, pulling, increasing speed, or pressing the gas a good deal amount) it could be your torque converter slipping. I had a similar issue, surprising enough the day before I planned on taking it to ford i changed the coil packs and it stopped? So it's hard to tell.

[kozal01]

Does it do it under hard throttle or just cruising?

[bigred5.4l]

If its doing what mine did, it made like a thunking sound. In fourth gear when the tq converter it locked. And unfortunately mines doing it again

[Raptor05121]

You have the 4R70W