trace - when the truck gets the "no bus" combined with shutting off, it might be the crank position sensor. i don't know why, but a lot of people seem to have problems with aftermarket crank sensors. so - if you can afford it, just get one from the dealer, or an oem one from the junkyard.
there's some very good, very old threads about no bus from ... i can't remember... a dodge tech from a long time ago.
he said - when it was showing a no bus - to unplug all the sensors and see if it would go away. then plug them back in one at a time and see which one triggered the problem.
RABBLER - http://dodgeforum.com/forum/2nd-gen-...-bus-mean.html
01 1500 Reg Cab 4wd 5.2 auto 3.55 285/75/16 steps tow hooks sc3815 180 3923 trans cooler filter posilok powertrax (removed) timbren britebox pioneer head rockford amp speaker cobra cb firestick hughes plenum water pump timing chain oil pump rear main hub bearings brakes shocks cracked dash cad bushings seals ujoints trackbar tcase Robert Griffin Trans