The number one reason for no reverse with that trans is a broken sun gear shell, but when this happens you will also have no 2nd and 4th. You said all the other gears work fine, do you mean that you can shift into them with the shifter or you have all the forward gears when you drive the vehicle?
Other reasons for just no reverse can be a failed reverse servo or its snap ring or a broken reverse band.
05 Superduty FX4
6 inch lift with Toyo Open Country 38s, 5 inch stainless exhaust, SCT tuner, ARP head studs, EGR delete.
Master Certified Transmission Rebuilder of 27 years of all Makes and Models
Transmission Shop Owner and Operator
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.