The rotors will fit from 84-down. You can use the 4.5 axles from 84-down if you have a 81/4 rear the carrier is the same for those from 1966-1996 [as per Auburn Differential] If you have a 91/4 84' model axles are the key to the swap [according to the Chrysler parts catalog] A true 3/4 ton [1/2"lugs] does not have a pocketed control arm Trucks with 9/16"-5/8" lugs have a pocketed control arm. All vans 78-98 with 1/2" studs have pockets & correct size balljoints. Dakota Drop spindles & a balljoint reamer for the steering arm work. You ream from the opposite side so the tierods don't have to be turned over. A 3" drop spring for a 94up Ram will get you 2". The rear is up to you