3.73s with 35s 72 K10 Th350 Auto & stock 350?

[1976gmc20]

Originally Posted by Zoomad75

If hills or mountain grades are in the plans for driving, I'd error on the side of more gear.

I've lived with 350/465/3.73 on 35's here in Colorado. Flat ground it was ok, but anytime the grade went up the poor little 350 was struggling to maintain speed.

I once had a 350/465/3.07 and oddly enough it did all right. Pulling my trailer up a hill you could just shift down to 3rd and keep right on going. Of course the speed limit was 55 in those days but it would run 55 in 3rd without any complaint. Solo it would get 18 mpg at 55 and 15 mpg at 80. You pretty much had to leave it in 3rd driving around town; 4th(H) was effectively overdrive.

Pulling my Cat on a rented trailer over Monarch, it did just fine in 2nd gear at 30-35 mph. Coming down was frightful though! I never did that again. I bought a Real Truck and had to sell the K10 to pay the bills.