Time for an update. The coach was running a little warm when climbing hills so I converted the fan to a larger unit and changed the radiator back to the original FMC stock radiator which is a five row brass unit. I can now take 6% grades at 60 mph and not have the temp gauge move at all.
I have also gotten a lot more miles on it as I have now put 48,000 on the conversion in the three years since it was completed. My measured fuel mileage over that distance has settled in at 13.43 mpg. That includes all fuel after the initial fill up.
Driving my coach with the D-Max LBZ and 6sp Allison is a sweet experience.
I am a happy traveler!
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