Gears!!
You'll have to get gears that are specific to the type of rear end you have (goes that for all vehicles).
You can't get 4.10's for a 8.5" 10bolt to fit in a stock 4th Gen's rear.
You'll have to get gears that are specific to the type of rear end you have (goes that for all vehicles).
You can't get 4.10's for a 8.5" 10bolt to fit in a stock 4th Gen's rear.

