That ZF 6 speed manual in yours is the exact same as the 6 speed in my 99 Powerstroke. Except mine has cooling lines like an auto, yours doesnt. Ford and Chevy used the same ZF manual transmission.
I have one. With 3 stock tanks and 2 bathrooms I never loose water pressure even if the cattle are at the tanks and we start dishes and laundry in the middle of me taking a shower. Worth every penny IMO.