Kinda gives me the inspiration to do something I've wanted to do for a while... install a 4BT in my 1984 F-150. The truck was originally my grandpas. Got it with 81,000 miles and now its got 225K. The ole 300 six is still reliable but tired.
Anyway... we've got SkyTraks at work (telescopic fork lifts, 4WD) that have 4BT's mated to Ford automatic transmissions. I think they are C6's. They had one out for a transmission rebuild last week and I was doing a little measuring. Would look nice under there! Probably do more than 55 too! Some of the models have turbo... but most are NA.