Hello all,

What are the possible gears that I have in my stock rear end? Since this truck is a half ton from 1951 with the flathead v8 was one certain gear ratio more common than another?

Thanks, Dave

 

If I recall correctly, we had a pretty long discussion about this like a week ago after you asked a similar question. The various stock options were mentioned in that thread. So you should be able to find it again in there.

But as far as your particular truck goes, crawl under it and look for a metal tag attached to one of the bolts holding the rear cover on the differential. It's usually at about the "4 o-clock" position. Clean it up and read the numbers. It will have a larger number (the ring) over a smaller number (pinion). Divide the smaller number into the larger number and you'll have your answer. For instance, mine says 41/11 which equals a 3.73.

 

I will dig for it, thanks!

 

Most of them are a 3.92.

 

The Shop Manual says 4.27 or 3.92

 

I will check when I get home, not sure what mine is off the top of my head. If I go to a 3.50 ratio I wont really notice much of a change. Leaning towards 3.00 right now with a 28" tall tire. Should give me a good cruising rpm at 60

 

This old thread will help straighten things out. Pay particular attention to post #10 by Numberdummy. But the bottom line is everybody needs to check their own truck to be sure of what they have.

https://www.ford-trucks.com/forums/8...ml#post8037040

 

Looks like Either gear I have is pretty steep.