I'm puzzled by the great divide on sale prices for the M715 vs the M37. I have been watching M37's for some time and they are always going near $10,000 and sometimes as high as $18,000. Now these are nice trucks, needing little restoration, but an equal condition M715 would go begging at $5,000! There were many more of the M37's produced and at any time there may be 5 stock trucks listed on e-bay whereas nice M715's listings are a lot less often. In fact, you rarely see a restored, stock M715 listed. Logic says the less of something, the higher the price.
What brings these high M37 prices? Better known? More parts available? Bad reputation on the M715 engine? Any guesses?