noise in rearend roaring

need some help I have a 89 to99 suzkuki grand vitara v6 the rear end has a roaring noise need to know if it has a place to grease rear or if anty one may know what it is it sound like I have a large set of tires on it with rough tread an I dont..... thank you the rear in has 90 wate in :banghead: it full....

Does the roaring noise seem to get louder with aceleration? My wife had a 99 Vitara that had a similar noise coming from the rear. The noise would get louder with acceleration. It turned out that I needed to replace the inner wheel bearing. The only other advice that I can give you is to drain the differential in the back and check for metal shavings. You may need to replace differential fluid.