Re: 5.4 Trans in a 6.8?
I don't know if anyone on here knows the answer to that, but I'd phone a local dealer and ask them if it can be done. They'll have the part #'s and such on their system to know if the 5.4L trans is capable of handling the torque of the 6.8L. With any luck you'll get a good answer, as a new trans can be quite expensive!
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!