4.10's or 4.30's for 8 3/4 gear swap

who installed the 4.10s maybe they wernt set up right i want to install mine but its a little tricky maybe ill pay the shop to set up the ring and pinion in the third member and ill put everyting back togther

dont know but they was noise on the drive side with what little street time i drove it. I set up the 4.30 gears my self and after 15 passes they are still doing fine. but saying that they could blow up the next time i take it to the track.also i am building a 73 duster and was wondering how you got your car down to 2800 pounds? have any pics of your car you could post? thanks Mopar65