Gypo Logger
the last of the 12 valve's..........i'd have to check my bill but if i rememmber correct it was around 4800.00. for the transmission with a mag tech extra deep al pan, rear shocks (bilstein), 4in exhaust turbo back, instal a tab kit for the kdp pin, adjust valves, cam plate for the injector pump and a cold air kit.
my fuel economy pretty much stayed the same. above 70mph the exhaust has a definite roar to it. with the cold air kit you really hear the turbo spool up. the power gain is huge and this was only a stage 1 set up. it's like driving a different truck now, it fun driving it again.
if it was my only vehicle and i used it for family trips i think the exhaust change would be pretty annoying. but since it's mainly used as a work truck and daily commuter for my self i like it.
but you need stacks up through the bed with no muffler.
as far as the front diff i can't really answer that, that vacume switch just slides a fork/ sleeve .
do you know about the turbo diesel register? it's worth the member ship fee for sure. there are guys on the message boards there that really know their stuff and could help you out with the front diff problem.
they could also get your dodge running 11 second 1/4's
http://www.turbodieselregister.com/