!!! new best but broke the rearend!!!!

Were the gears set up right? It looks like maybe the side adjusters were not tighten properly and the backlash widened.

you are probly right. the owner i got the car off of said he just put a brand new set of 4.10 in the car right before i bought it. but he said he thought he set them up wrong so gave me a brandnew set to put in it.which i was going to do but ran out of time.i found a truck dana 60 i am going to get and while i am saving up the money to build it up for my dart.i am going to have my new gears set up and give it a try again next year.thanks Mopar65