2 weeks ago, my truck had a nasty squeal coming from the belt drive. I replaced the belt and it completely stopped for about a week. A few days ago, I have been hearing a high pitch squeak again while driving. It only squeaks while driving and is worse when I let off the gas and just coast. I can start the truck up and let it idle in park with no abnormal noises what so ever. I re-adjusted the belt on the pulleys and sprayed a little bit of silicone for lube. The noise is still there. I initially thought it was a bad pulley but wouldn't it be squeaking all the time, not just while I am driving? My only other thoughts are it could be a bad wheel bearing or a bad u-joint. Thanks in advance.

Dan

 

Your tires? You do have a 2WD V10!!!

Take your Idler pulley off and grease it.

 

Idler pulley is brand new. Yes, it is a 2WD and the tires hum every time I drive.

 

Greased my idler pulley and belt tensioner pulley this morning, squeak is still there. When I had the tensioner pulley off, the bearing was hard to turn. I checked the belt when it was running and there seemed to be a little play in the tensioner- the pulley was moving up and down. Could I use a tensioner off of a 5.9 gas/cummins?

 

Probably not. Lemme check the P/Ns.

Nope, different. But same prices. Around $58 for a Gates.

 

Alright, cool, thanks anyways.

 

Are you sure its coming from around the engine? Sounds to me like a pinion bearing or something along those lines.

 

Ah, it was nothing!

 

Yeah, when I pull on the throttle cable, I can hear it coming from the tensioner. A pinion bearing is in the diff, correct?

 

Yeah, thats what he is taking about.

Sounds like a definate engine problem.