i notice my truck(Monster gt) is hard to move, like it has some resistance to it. i checked the brakes and they're fine, opened up the tranny and nothing was wrong in there. i did the test to see if my diffs were bad (holding front/back wheels off ground and pushing to see if the front/rear locks up) and they're fine. i don't know what it could be, i hit the gas and it just creeps along. when i push the truck i can feel the resistance. anyone know what this could be?