3.55 from 8.25

Keep the carrier and the ring and pinion.
The carrier is specific for like 3:21 and down ratio. The higher gears like 2:94 or higher use a different carrier so you cannot put the wider / lower gears on it.
Syleng1
Well I put a 4.30 and a 4.56 on a 2.92 carrier the only thing to do was grind down the pinion shaft to get it by the ring gear as by the mopar manual ,it was a sure grip factory 1978 .