Lifted 85 K5 grinding noise when let off gas
 

Just picked up an 85 Jimmy and finally got it mobile. Has at least a 4"lift (Measured the blocks. Not sure about springs) I'm getting a grinding noise when I let off the gas at higher speeds...maybe 45mph+. Took a few pics of the driveshaft to see if the angles look right. Not sure if it would help to shim it up or if I have enough shaft engaging the splines of the transfer case.

Re: Lifted 85 K5 grinding noise when let off gas
 

One more

Re: Lifted 85 K5 grinding noise when let off gas
 

I think you found your problem. Lengthening your drive shaft will help the angle on the upper U-joint. You might need a xfer case drop but not sure, I've read mixed reports about that.

Re: Lifted 85 K5 grinding noise when let off gas
 

drop your transfer case about an inch.

Re: Lifted 85 K5 grinding noise when let off gas
 

Thanks guys...:thumbs:

Re: Lifted 85 K5 grinding noise when let off gas
 

Unlift the truck.

Re: Lifted 85 K5 grinding noise when let off gas
 

I got the factory leaf springs and shocks when I bought the truck so that's a possibility, and I'm not opposed to the idea. If I could trade my 35's for some nice 33's I would seriously consider doing it.

I dropped the transfer case tonight so I'll take it for a test run tomorrow and see how that goes.

Re: Lifted 85 K5 grinding noise when let off gas
 

Transfer case drop did the trick. No weird vibes or grinding noises now. Front driveshaft is close to the exhaust crossover but haven't heard it make any contact. Gonna keep my eye on it and make sure it's not going to be an issue.

Re: Lifted 85 K5 grinding noise when let off gas
 

Glad the transfer case drop did the trick. It helps correct the steeper drive angle.

RIZ