I have a Truc Trac 916A427 Posi that will fit 96-2011 Ford, GM trucks 92-07. This is a 37 spline unit for 4.10's and up. Will work on ford 3.73 thin gear sets also. This unit has maybe 500 miles on it, truck was rolled over and parted out. Cheapest price online I found was $590 before shipping. Looking to get $400 picked up. This is the best carrier you can get. If you have any questions call or text me. 817-888-4657