My truck started making a belt slipping noise with anything but light throttle every time on the 2/3 shift right after I put a FTVB in. My guess is that the motor decelerates quicker for a split sec. and the blower can’t keep up and the belt slips. The noise is a little worse when I let off the gas right before it shifts. What do you guy’s think, is this possible? Has anyone else experienced this? It doesn’t slip enough to squeal and I have no pulleys on my truck with 8584 miles

 

Mine slips only when I let off right before a shift. If yours is slipping under moderate to heavy acceleration? I'd check for proper tension from the tensioner. Or maybe a too long of a belt?

One thing to keep in mind everyone. Is that when you absolutely STOP the slippage. You also increase the loads placed on ALL the F.E.A.D component assemblies. (front end accessory drive)
This increased load puts a higher than designed load on the castings, brackets, and their individual bearings.

Just a word to the wise, WOT

 

I was experiencing the same thing, and emailed Greg Evans. According to him, this is not uncommon. His recommended fix was to make the switch to a Gatorback belt. I changed the belt and the problem has mostly gone away. I still get it once in a while on the 2-3.

 

Hmmmmmm. I'm not convinced it's belt slippage--but it may be? Look for rubber dust on the castings behind/near the idler pulleys. If it turns out to be belt slippage, get one of these:

http://www.goodyearbeltsandhose.com/cars/gatopoly.html

and your "squaels" are over!

Btw, did you check the trans's fluid level--carefully and properly?

Dan

 

I am confused by this?? How are the accesories effected when they are on a seperate belt/tension setup?? If you make the blower belt nice and tight like with a Metco idler kit...........how does that effect the F.E.A.D.??

--Joe

 

I still get some pretty bad squeals out of my gatorback.......hummmmm

 

When you suddenly slow everything that is rotating at a high rpm, there is a spike load placed in a certian designed vector. Usually this comes from the A/C compressor and under certian circumstances. We design the castings, brackets, bearings & pulleys based on this in conjunction with everything else that's going on.

But now the sudden *acceleration* (deceleration to ya'll) comes at a different and undesigned time/load. This spike in load is obviously greater cause now the *acceleration* is greater. Resulting in belt slippage. (both or either belts. Does'nt matter which) Fortunatley the vectors are the same and we've built in a safety factor.

If a guy is interested in longevity? I'm recommending that you just live with it. If you want no noise? Then get a better belt like the gatorback. But you'll wear out everything faster that way.

For what it's worth, I'm running the stock belt w/a 4# lower and only get a squeak when I let off right before a shift.

WOT

 

here is what i did to a pretty new gatorback belt.

i don't know how i did it, but it looks like this in several sections.

 

Thanks for all the input guy’s. I’ve checked my Trans fluid a bunch of times on a level surface and looks to be good. I’m thinking of disconnecting the blower and driving it to see if it will repeat, my guess is no. I’m sure if something’s slipping it would be the blower seeing how it has the most rotating mass.

 

It very well could be both. My CrownVic does it at full song. (shift kit and 4.10s) Been that way for 30k + miles on the same belt.

I really would'nt sweat it other than to check the pressure on the tensioner.

WOT

 

Do guys with electric fans still get squeals? I was thinking that it might be the fan belt.........and not the S/C belt afterall.

 

It doesn’t bother me as much as long as I know what’s causing it.
When you say check the pressure on the tensioner, I wouldn't know what kind of pressure should be on there?

If it were really weak, that would be the only way I would think it was bad?

 

Keep in mind, it could be the idler/tensioner pulley(s):

https://www.f150online.com/forums/sh...=pulley+grease

Dan

 

FTVB, Electric Fan, Electric Water Pump.

Mine squeels, but I have to agree with wydopnthrtl when he says that it really isn't a bad thing to have it slip under extreme pressures. But I think that it's the SC belt and not the FEAD belt.

It used to bother me, but no that I know what it is it doesn't bother me too much anymore. If my belt wears out I'll probably opt for a gator belt.

 

I also regreased my bearings, so it's not the idler pulleys on mine, even though they showed bear metal in places.