I'm contemplating purchasing a camping trailer and am trying to figure put my axel ratio. Can anyone tell me how to do this ? Thanks, Carol

 

Your Ford's axle ratio on rear wheel drive is on a tag on the final drive assembly (pumpkin). Look on the tag for a decimal number like 3.55 That will be the ratio.

Here are some neat calculators..

http://www.jeepster.org/swchapter/calculation.html

 

Homer, I went to the link you provided, good info. I was wondering what the original tire size has to do with the equation. I don't know what the original tire size is and the door jam sticker is damaged where it lists the original tire size.

 

The gear ratios are important as to how many turns the driveshaft
turns for every ONE turn of the wheel .

The height of the tires , or more accurately the circumference =

The outer diameter length in inches .

Very important to how many turns it will take to " do " a mile .


Gear Ratio Calculator


I have an old truck that has the original tire size listed :

{{{ only as 6.00 X 16 }}} can anyone tell me how that equates into our NEW world of tire dimensions ?

I am using the tire size of 235 / 75 R / 15

although , besides the rim size being smaller than original ,

Something tells me that just by having a " wrong " rim size makes

the speedometer inaccurate .


Ok, I've done plenty of rambling ......

To get back to your question / answer :

I suspect that if you were to check back to when your truck was new ,

there ought to have been a brochure or some other info page , etc ,etc ...

All for now ,
Tim

 

In a " worst - case - scenario "

It'll be necessary to pull the gears out of the rear axle . . . . .

On the FORD 9 inch it's also needed to remove the driveline from that U - joint . .....

I'm told that the ratio numbers are stamped into the ring gear .

OTHERWISE : it's stamped into a tag ( supposed to be ) bolted to the rear housing .

 

That post you answered was over ten years old.....