I don't know where you got all these ideas, but Brian Does build some of the parts he puts in his trannys, and NOBODY else has them.....when you're running 1000 hp, and an E4OD is staying together behind it, I'd say that's prettty good....a high percentage of the draggers and sled pullers use HIS transmissions for a damn good reason, they stay together !
you want to try building a trans for 600hp ? good luck.... and good luck getting somebody that DOES build one outta your idea of what parts to put in it giving you any kind of warranty.
Brian makes a living building EXCELLANT transmissions, and by treating his customers right, and I for one am a VERY satisfied customer, mainly because the trans was installed three years ago and it hasn't done anything, anything but WORK...... and when this truck moves, it is always hauling my 30 ' 5er, and it weights 21,000lbs combined, so it's under a pretty good load everywhere it goes.
suit yourself, you will anyway, but I consider the money I spent on my BTS, a VERY worthwhile investment.
It ain't about how much it costs.......it's all about it NOT going "CLUNK" out in the middle of NoDamnWhere, in the middle of the night......