I'm getting a rough grinding/ vibration as soon as i let off the gas, mainly going down hills, it doesn't do it coasting and it doesn't do it accelerating, just right in between there is when i hear it, any thoughts? I'm driving a 94 SE with a 3" RC and 30's

 

check all the oils,
Differentials, Transfer Case, Tranny.
Look for signs of leaks at the axles coming out of the drums.
Might be internal in the transfer case too, a gaulded bearing can make a chatter when unloaded.

 

Check ujoints too.

 

Well i've had the lift on for about a year now, and i'm pretty sure this all started shortly after that, so could it be a vibe from the new angle or is a 3" to short to affect that? but thanks for you're help guys, i'm greatful.