I have a 2001 SuperCrew with the 5.4 and (I’m pretty sure) the 4R70W. I have noticed that when I jump on it hard off the line, I get a rather disturbing squeal or squeak noise on the 1-2 shift, and now that I think about it, I may get the same thing on the 2-3 shift as well. Much as I’d like it to be, it damn sure isn’t the tires, so I’m about positive it’s the trans that’s making the noise. I rarely run the truck that hard, so it’s not as though the trans is abused. Any ideas as to what the problem could be would be appreciated, as I like to show up at the service drive armed with some knowledge as to the problem, to avoid service writer BS.

Also, this thing holds a gear like no truck I’ve ever had. Often times in 2nd or 3rd gear, even full throttle won’t give me a lower gear. Is this the standard for this trans, or is it a malfunction? If it’s a standard issue, then does anyone know of a mod that improves this without major surgery?

Thanks in advance for any help.

 

I have exactly the same thing with my tranny. I too have the 4R70W in my supercrew, and I wondered the same thing. It isn't nearly as bad with my Superchip in, because it doesn't hold first gear quite so long when I punch it. I would like to know what it is though.

 

It's not the transmission. It's the fanbelt. Fairly common problem with the 5.4L engines. Have the dealer check all the pulleys for alignment and replace the belt.

 

Yep I get the same thing and I thought it sounded like the fan belt too. But it's nice to know that I'm not the only one. Also I did not notice this before my superchip. Maybe the later shift and quicker shift is causing the belt tention to drop for a second???

Dosen't bother me, not gona worry about this one.

 

Mine's just the opposite. My chip made it less pronounced. I could have sworn the sound was coming from underneath the car, not under the hood. I already have my FIPK sound from the hood, and I can tell that is where that one is. I guess I just want a few more opinions before I agree it's the fan belt.

 

There's a whole lot of people on this board, and I am sure they all have opinions, but not many are gonna be able to hear your truck squeal.... I say the belt....

 

Its your belt, just had them replace mine. That fixed it. Man it was a pain the the keester to change, I felt sorry for the guy who did it. (I watched him change it) Nothing in the tranny will make that noise.

 

It'd actually be a relief if the problem was the belt, as those are substantially cheaper than transmissions, (why do I care though, its under warranty). I'm going to look into it further, and I'll let you guys know what the verdict is.

 

I have a feeling that it was easier to spot a squealing belt in the older trucks because there wasn't any underhood insulation. Maybe with the insulation, the sound is coming in a more indirect route, leading one to believe it's the tranny?

 

Same belt squeal on mine too. It started at 11,000 miles.

DOES THE FACTORY WARRANTY COVER THIS ONE?

 

There were several of us with this problem and I don't know of anyone who didn't get it covered under warranty.

BTW, a couple (maybe more?) members said their dealers discovered problems with the tensioner and replaced that AND the belt.

 

Thanks for your quick answer Dennis!!!