70 1/2 ton what gear ratio?

[bigmoe]

Any idea what the gear ratio might be for a 70 1/2 ton with a 6 cyl std trans? It might have been a 3 on the tree but I see an aftermarket floor shifter in the pictures. Is there any way to tell by data plate? or do I have to look for stamped numbers on the tube?

The truck is a distance away so I'm wondering if it's worth driving to check the ratio. I want a 3.73.

[Mbeef61]

Numbers on tube might occasionally tell you. Didn’t help me. You can turn the rear wheels and count revolutions of the driveshaft. Best way is to open it and check numbers stamped on ring gear and divide. Numbers on tube could be different unless you are positive it’s stock. Someone could have replaced them with different gears than what is stamped. Also opening allows you to check condition of the gears.

My truck was 71 and i6/3 speed and had 3.73.

[Redneck Rydes]

Most likely 3:73, V-8 came with 3:07 and 6 bangers came with 3:73

[garyd1961]

I thought the automatics came with 307 and stick shifters came with 373.

[Redneck Rydes]

I had a1971 chevy 6 cyl with a powergide and it had 3:73 posi

[Stocker]

Back in the day, many cars & light trucks could be ordered with the gear ratio of your choice, within a range. So no telling unless you check the stamp on the ring gear, or count the teeth and do the math. Number of teeth on the ring gear divided by number of teeth on the pinion = your gear ratio.