According to my engineering specs, a 1985 K-10 was only available with two gas engines, the V-6 and the 305 V-8. There were 3 manual transmissions; the 3 spd (RPO-MM3), creeper style 4 spd (RPO-MM4) and a 4 spd overdrive (RPO-MM7). Since the driver was shifting a floor lever for gear changes, it had to be one of the 4 speeds. The gear ratios in either 4 spd are such that you have 3 working gears like the 3 spd plus either a creeper low or an overdrive. Really not a good selection. So what axles were available?
V-6 = 3.42 and 3.73 with MM4 and 3.73 with MM7
V-8 = 2.73 and 3.08 with MM4 and 3.42 and 3.73 with MM7
GVW is 6100 pounds for all and the tires looked to be the optional 31x10.50.
With those cubic inches and the sad axle ratios, this truck had to be a real axle snapper. :thumbdown:
For what it's worth, I'll take any one of the pre-emissions trucks for towing.