PLease, please, please....take my advice. My good friend didn't and spent a lot of cash trying to fix his output shaft because of the same issue. He tried the "retighten it and forget it" thing... didnt last more than 5k miles. Then he tried to spike the nut and dimple the threads... did it again. Finally he bit the bullet and bought the shaft and gear kit from Dan the Gear Man at Quad 4x4.com NOw the truck is fixed. Also invest in the Fast Cooler and filter kit, then when the trans is filled to the fill plug; pull the shifter and dump another quart of fluid down the hole. If you spend the extra cash now, you wont have to replace the whole trans later... Good Luck... Chris