i feel ur pain ive just hit 340k on the oem motor and lots of stuff is falling apart.ive changed the rear 3 times bad used ones should have rebuilt it but price was right cuz im in the business.3 trans tried 2 used and finally just rebuilt the third with all the goodies good for about 425hp.then brakes, couple alts, new power steering pump,and water pump,stupid window regulator ive done bout 3 of those and of course mid summer the compressor goes.anyway the thing is ive done the brake upgrade its lowered now and with the good trans and a 6.0l waiting on my engine stand i think it would be hard to replace and then have to do all my upgrades again.so screw it im getting a new cam for the 6.o and i bout long tubes new injectors.i plan to put an escalade gate on it since ive got a nice pancake starting at my lock assembly and probably a true trac