I have a 2000 F350 Dually, I had the gears changed 5000 miles ago and now uped the tire size! My new set up is a 3:50 ratio with a Detroit TrueTrak. Just want to go back to 4:10s. Just thought I would trow it out there before I spend a bunch of $ again.

 

Kieth are you in a hurry? I'm wanting to do the opposite, We need to check what will fit, mine is a 2001 F350 SRW, not sure if open or LS. Lets do some homework, my email is artiebee@hotmail.com