Hey yall. I got a 04 Screw FX4 that is starting to get vibrations from the rear end dring low speed turns. It started a few weeks ago and slowly seems to be getting worse. It only does it during turns at low speed, it cant be noticed above 20 or so. Just wanted to hear yalls thoughts.
'Preciate ya

 

Sounds like the LS clutch packs need some friction modifier. Add a bottle to the rear end and see if the chatter goes away. Use the Motorcraft friction modifier.

 

If you have close to 100k on it, I'd change the rear diff fluid, not just throw modifier in it.

 

Does it happen when your trying to get in a parking spot or leaving one type thing cause I have something like that it makes no noise but u can feel the truck almost "shake" and it FEELS like it comes from the rear...?

 

I have this same problem, But I can't identify where it is coming from. I thought possibly the rear end or maybe a front wheel hub, I will check the rear end this week end.
120k miles