so my 01 5.4 4wd auto makes a weird noise when shifting from 1st to 2nd, today when merging onto the parkway i nailed it from a dead stop and held my foot to the floor threw 2nd gear n when it shifted from 1st at about 5500 rpms it made a noise like a old v-belt slipping but it only lasted for about 1-2 seconds, my trans fluid looks brand new. is the transmision hurting? could a trans fluid change and posibly an aftermarket trans cooler help?

 

If it is a short squeal at the shift, it is more than likely your accessory belt slipping with the quick change of rpm. Put on a Goodyear Gatorback.

 

i didnt think a serpentine belt could slip like that, and doesnt the f150 have an auto tensioner

 

Yeah, trust us, they do slip and make a squeal.

Go get a Goodyear Gatorback belt and the 'problem' will go away.

Darrin

 

Think about it, the engine is going from 4-5000 rpm to probably in the neighborhood of 1-2000. The accessories are still at 5000 (or whatever they were going) the belt is the only thing slowing them down. They are "laying rubber" to slow down.

 

Yep it's a belt. I had the same thing, got even worse after I put in a shift kit. As the others said put on a Goodyear Gatorback belt, after I did that no more squeal.

 

i just changed the belt and it stoped but i noticed another noise at 3200 rpms, neutral or in gear, it makes a whistling noise

 

I would say the whistling noise is a vacuum leak. Try to find out where the noise is coming from then check all lines in that area for a small hole or crack.

 

i have an 01 4x4 also and when i get onit to merge about45-50 mph,my tach shots up and some times it squels .i itook it to a trnny shop ,he couldn't find anything wrong so i've been just living with it.any ways (1 too many millers today) are you saying this also is just my supintine belt!!!!! and i wont be needing a new tranny soon?????

 

sounds like a belt to me. Mine used to do it really bad after i did J-Mod (shift kit)

 

i changed the belt to a gator.but it still shoots up ,not as bad .