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Message:: [QUOTE="'07 KW w/53' Conestoga, post: 8407498, member: 171114"]Hi John, thanks for the info...whats the name of the shop in Minooka?  My mechanic is in Channahon, Precision Truck Repair...Mark is the owner, nice guy, caring about providing quality service, very smart and easy to talk to. Yes, the pull power is different, but, I have a 13 speed...drop half a year, I can make most hills in IL, drop a full gear and I'm good.  I do notice needing LL on big hill with heavy load. I appreciate the heads up on the Bully Dog...that's a big expense. Definitely have (and watch) the pyro and manifold boost pressure. The boost gauge only goes to 30 lbs, which I can peg pretty easily.  Maybe I should swap that for a bigger gauge. I'll let you know on the economy. You friend should DEFINITELY lower the rear ratio..,the savings in fuel will pay for it plus less wear on his motor = extended life. My truck has 1.540 MI, and I had no records for rear rebuild, so, my assumption was it being original.  So, I figured it was time to rebuild it anyway. Mechanic said good thing I did, power divider had a chunk out of it...just a matter of time before it gave up.[/QUOTE]