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Nah... not gonna blow the jeep, it did fine up in Co.. even with the A/C on.. might turbo the 300 though... The Jeep is Computer Controlled, so there was no question on whether it was going to give problems.
Diesel engines are really not prone to problems with altitude changes. They don't use a set fuel ratio like a gasser does, the run on a stichiometric fuel table. Besides, Barometric pressure and thin air aren't an issue when your shoving air in at 20#'s of boost lol :-)