I recently just bought a 2000 Jeep Cherokee sport 4.0L that has 116,200 miles on it, 31" bfg tires and a 3" skyjacker suspension lift on it. When i accelerate from a dead stop i have a growling noise with vibration coming from underneath my feet around the transfer case. The previous owner said the lift and tires were only on the jeep for about 7000 miles. What could this be?

U-joints need to be replace?
Transfer case needs to be dropped or sye need to be installed?
Driveshafts need to be balanced?

 

Could be?, yes,yes,yes
Check your trans and engine mounts also.