Lift Kit problem

[GHrnndz]

Hello everyone,


I joined the community here in hopes of solving my current problem. I recently got a 7.5 inch Rough Country lift kit installed on my 2007 Yukon SLT 4WD. The problem is while I am driving and let go off the gas. The very front middle bottom of the truck makes a very loud rubbing sound. It only makes the sound when I let off the gas... if I step on the gas the sound stops temporarily but returns as soon as I let off the gas. this sound does not happen while I set my truck on 2WD. So essentially, it makes a rubbing sound ONLY when the truck is on “Auto” or “4WD” the truck never did this before the lift. The shop that installed my lift kit reviewed my truck tightened everything back but the problem persisted.

Any ideas? Any advice is appreciated!

Thank you,

Gerardo H.

 

[Big Mama]

Take it back to them. Make a video of it happening.

 

[Joseph Garcia]

Welcome!

Sorry that I cannot assist you on lift questions.

 

[Matt_]

Probably a CV axle or driveshaft. The angles from the lift often make old joints that seemed "ok" suddenly make noise. Try removing the front driveshaft and see if the noise goes away.

 

[GHrnndz]

Probably a CV axle or driveshaft. The angles from the lift often make old joints that seemed "ok" suddenly make noise. Try removing the front driveshaft and see if the noise goes away.

Would that explain why it makes noise with 4WD ONLY when I let off the gas?

 

[Matt_]

Would that explain why it makes noise with 4WD ONLY when I let off the gas?

Yes, doing so changes how the load is transferred through the joints; torque from the drivetrain vs torque from the tires. When you're on the gas the load/rotation in one directions may take up play in a worn joint vs when coasting

 

[fiatdale]

Might be u-joints on the front shaft.

 

[yates ™]

Post up pictures of your front lift especially showing cv axles and drive shaft.

 

[Eric70]

Any updates?
Have you checked for any play or looseness in the driveshaft? Especially the slip splines.
Give Rough Country a call and talk with tech support, they've always been helpful with my projects .

 

[01Konvict]

Front driveshaft u joint angle is causing that issue. You need a dual cardan shaft if you plan to drive in 4wd at highway speeds. Even RC will tell you the same.