hi guys. I sold my 89 commanche w/ 230k 2wd 4banger for $600, and bought this 92 cherokee laredo 4x4 4.0L w/ 134k for $800. The guy told me it needed a wheel bearing and shift lock switch($$$$) ( no start in park, nuetral only). Clean jeep, drove it , seemed cool. Now the more I drove it sounds like a rear end vibration worse from 25mph-50mph, but not nearly as severe at 55-65mph. Had my bro take it to work (jeep dealer) my buddy pulled the rear diff cover, very milky gear fluid, cleaned, inspected, resealed & added fresh gear oil. noise got 60% better, but still a lil noisey. Only occurs under acceleration, not when you let of at any speed. U joints looked good, and the normal. Is there any ideas anyone has I could be dealing with or need to check??? Other issue that has just started Im hearing a noise under slower accelerations almost like a fan hitting the radiator (squeak,ping/tap, something) but noise is only present while accelerating from a stop or a yield on turns. Cannot make the noise while in park or nuetral. Sorry for the long story form, but I wanna be as informative as possible, my bro is a parts manager at jeep dealer, so cost is a non-issue....just need some help... Could I have a mount causing the rear vibration, axle bearing, driveshaft? any help would be appreciated.....thanx.:???: