The wrangler that I'm about to buy is a great wrangler. The ONLY problem that is has is whats keeping me from buying it. When The car is in gear andyoure driving it drives great. However when you let go of the pedal there is like a rumbling noise. you press the pedal again and the noise is gone. Also, the car won't do that when the gear is in neutral. When we were test driving it I stuck my head off the window and the noise was coming from the back of the car. My uncle said it was either the transmission or the differentials. The lot owner said it was just the tires. The noise somehow did seem to be coming from the tires, but I doubt it. Uncle told me it could be the rear differential. Would anybody know what the problem could possibly be? (Wrangler is a 95 Rio Grande Edition 4 cyl, std.)