I'm doing a 4bt swap on a 53 1 ton and wish I could do a 6bt swap as they are much cheaper. Ebay is not where you get 4bts unless you want to pay all the money.
You haven't been around long, not sure if you have been lurking, you'll find most people here are happy with the power/acceleration of a 235 in a medium duty truck.
The stock 4bt I am using is rated 120 hp meaning 300+ ft lbs of torque off idle. Much more than the 235 is capable of in my 39 1.5 ton. Add an intercooler, turn up the pump and a holset turbo will put it around 170 hp with 200 hp and 400 ft lbs not out of the question. If you mosey over to colorado k5 or the turbo diesel register they are pumping them up over 250 hp and 450 ft lbs for rock crawling.
Getting the rpms where they should be is another issue. Gonna start with an eaton 4.10 rear. Haven't decided to stay with a granny 4, torque splitter plus auxiliary or go automatic with overdrive.
There's been lots of diesel discussion here lately with Grigg leading the way on actually getting one completed with a 4-53T.
I can think of plenty wrong with a 6.2 or 6.5 if money isn't an object. But I can't think of a better diesel for the money if you have room for a v8 and not a straight 6.
