My dad and I are very heavily considering replacing the engine in my 1997 2x4 F150 during the summer, swapping out the 4.6L with a high performance 5.4L from Sean Hyland Motorsports, or maybe even just a regular Lightning engine. However, I don't have any clue as to what transmission I would put in place of my current one.

Do I even need to replace the transmission? If I do, what would be the best transmission to use?

Thanks in advance.

 

I know that the Lightning uses diesel guts in it's trannys to hold up to the torque.
Jimmy

 

The Lightnings use the 4R100 tranny.

 

Do you know where I can find a 4R100 tranny? I've looked, but I can't seem to find one.

Thanks in advance.

 

http://www.baumannengineering.com/
I've heard that the 4R100 is just the new name for the '95-up E4OD, but I'm not into slushboxes.