About 2 weeks ago I towed a Uhaul trailer. Well ever since I towed now when I take off it seems like it doesnt want to girp. The tires arent spinning or anything. My Transmission fluid looks normal and shifts normal. Then when I reach 45 mph and up to 50 mph it does this jurk. But I dont think its my transmission. My U joints are good too. I was told it could be my rearend. How can I tell? Please help!!