17yrOldStanger said:the auto is the same tranny from the S-Type Jaguars.
The 5R55S auto trannie that the 05+ Mustang uses is an updated version of the 5R55N that was used in the 00 - 02 Jag S type.
In 2003 the S-type switched to a ZF 6 speed auto for the V8 (may have still used the 5R55 in the base V6 model). Starting in 2004 all S-types got the 6 speed ZF. The ZF is quite a trannie, blows away the 5R55 in refinement and can handle a lot more torque.