This morning I finished up a few things on the truck, new starter, compressor wheel, gutted pedestal, up pipes, hpop hoses, o-rings along the way.

Got it started up and it sounded good, put it in reverse and I hear this awful screeching sound, I'm attaching a youtube video of it. It only does it in reverse with at least a slight bit of throttle, doesn't do it in drive. It will do it when moving as well as stationary with the brake held.

I don't think it's the compressor wheel rubbing as I stuck my head as close to the turbo as possible while the wife put it in reverse, it sounded lower. From underneath it seems to be on the drivers side, near as I can tell around the exhaust manifold. I did drive it for several miles. By the time I got back, it wouldn't make the noise anymore. I let it set for 8 hours and when I moved it this evening it's back to making a racket.

I just spent a while working on this thing and I'm not to eager to tear back into it, any ideas what to look for or where to start?

https://youtu.be/GwRIxSBiqdI

 

Man it sounds like the down pipe is rattling against something. Maybe the uppies but I wouldn't think those would have enough play to rattle like that.

My down pipe used to rattle against the transmission crossmember before I massaged it with a sledge lol

 

I messed around with the down pipe and couldn't get the noise to change, it has slightly rubbed on the heat shield underneath the truck before but it isn't now. It's pretty tight space where the drivers side up pipe turns up, but as far as I can tell it's not contacting there. To me it's just weird that it only does it in reverse?

 

Did you take the small dust cover off the bottom of the tranny. You can put it back on wrong and it will just make contact with the fly wheel. Been there done that

 

I was thinking fly wheel as well. Done any work there?

 

Edit: Had a few minutes between work and evening plans, so I pulled that dust cover off. The squeal is still there

 

Don't think his made a noise, but buddy DP was smashed against the groundstrap bolt. Something to look at

 

The noise had reduced in intensity, but was still annoying me to no end, and I was embarrassed to drive the squealer. I checked the turbo shaft for play and to see if the compressor wheel was contacting, nope. Loosened and re-torqued the up pipe to manifold bolts, downpipe clamp, turbo to collector clamp, nope. Dust shield, nope. Removed the serpentine belt, nope. Spent quite a bit of time checking things over and pulling my hair out trying to find the source. This afternoon I decided to drop the new starter out and put my old one in. I don't see how in the world a starter could make that noise, but in desperation I swapped them and.... success!!!!!!! I'm feeling a whole lot better about the truck now, disgusting that it took so much frustration to find the cause. They're sending out a new denso style starter.

 

I would of never thought of that. But if it started after install, then yes. It must of stayed engaged.

 

It's just unfortunate that I did a bunch of work at the same time, if I had only done the starter that would have been my top suspicion. Oh well, I'll sleep better tonight.