GM Guy
Manual Trans. 2WD Enthusiast
This was Saturday, 6/18/11. Donner Summit, 20K lbs combination. running right up to 210, with a brief stint to no more than 215 degrees.
bone stock, running the hottest OEM program for anything with a pickup cab AFAIK (Chassis cabs got 430lb/ft with manual or auto, compared to pickups which got 10 or 20 less lb/ft with the manual, all according to my 99 commercial brochure) backed up with the NV4500 and all in a 2wd truck to ensure what little power there is makes it to the pavement.
havent done anything to the truck since buying it other than changing all the filters when I first started using it, and doing regular oil and grease jobs since then. I did make sure to verify good LP operation, but other than that, no clue what I was running for boost, egts, etc during the pull. We were on a schedule, so we couldnt mosey up the hill, se we ended up in 3rd taching as high as 3 grand, pulling 2750 most of the way up. my theory was egts spike higher when lugging, rather than screaming, so we let er rev, and try and move plenty of air, and it must have worked, as she still runs the same, and not any hint of damage. it didnt de-fuel either.
we bought some trucks in CA, so we trailered er out of the state, and I drove it from ID to KS empty (8500lbs, light amounts of crap in back, but otherwise a fat truck with a big ol bed) and I set the cruise at 1900 RPM and she gave me 18 mpg, hand calculated, topped off both times.
In conclusion, I think that kind of behaviour deserves some guages and a 4 inch exhaust, maybe a fluidampr as well!