BTS for sure man. Mine is being built next Wednesday, and after talking to Brian, I have absolutely no doubt in my mind that it will handle everything I can throw at it, and last. Some of the highest HP trucks out there are running BTS trannies and they simply take the abuse with little or no problems.
Do yourself a favor and call BTS and talk to Brian, talk with him about what you're doing with the truck and I can guarantee that he'll put your mind at rest when he tells you about the kind of stuff guys have been doing to his trannies with no breaks or problems.
I blew 2 "built" trannies from a local diesel shop and then decided I was going to bite the bullet and send my trans to BTS to get done for the final time. Amazing customer service, warranty, reputation, quality, and track record.
Do the tranny once, call BTS.
Early 99 F-350
4" lift on 33's. Daily Driver/ Plow truck.
Swamp's Gen3, 300/200's, Tuning, 76mm Sledgehammer. BTS. Fuel system, ARP's, P-Rods, 910's, and a few other things. Stock Block.
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2009 F-350, 5.4L, 4" lift on 35's