http://www.fordforums.com/showthread.php?t=39361

 

Your owners manual will have the info under towing but according to my book, code 17 is a 3.31 open diff.

 

Per Ford factory manual for 1995, axle code 17 is a 3.31 non-limited slip drive axle with a 3800 lb Gross Axle Weight Rating.

Dave / Believer45

 

"92 BigBronco, you have faster fingers than me. Beat me by under a minute.

Story of my life! (hee hee)

Dave / Believer45

 

That's the first time my two finger typing method has been called "fast" LOL

 

i beat ya both with one hand tied behind my back.
he he

 

well i was faster than all of you, it was so fast you didn't see it

 

yea right,
actually you were probably sleepin.

 

yeah damn time difference

 

it's only about 14 hrs difference though !

 

i beat ya both with one hand tied behind my back.
he he

I read the post you linked to. Interesting way of doing it with the string. Easy way of doing it if you don't have a floor jack.

One thing though, hate to be a stickler.....so don't take it personal.

What if the ring has 32 teeth and the pinion has 15 teeth? By your method, the rear end ratio is 480.....but it's actually a 2.13:1. You divide, not multiply.

 

92bigbronco, i dont know what to say about that you might have a point but i will look into this a little bit more in my spare time.
but i dont think you should divide the numbers to find their ratio.
counting teeth is the most exact method possible but if i divide 31 ring teeth x10 pinion teeth i come up with 3.1 so it still tells me 310 rario.
so my question for you is this.
is it even possible to have 15 pinion teeth and still have 32 teeth on the ring gear.
and if it is how do you come to your conclusion of 2.13 and not 480.
im not asking to be smart i dont understand

 

The numbers I used were only an example but the method is correct. The example you're using works out because you are multiplying by ten. The fact that it ends up being 310 is purely coincidental. You have to divide the number of teeth on the ring gear by the number of teeth on the pinion to calculate the gear ratio.

Think about it.......if the ring gear has 36 teeth and the pinion has 12 teeth, the pinion has to turn 3 times before the ring gear will make a full rotation......thus the 3.00:1 ratio. By your method of multiplying, the ratio would be 432 which isn't even a ratio at all.

If you divide the number of teeth on the ring by the number of teeth on the pinion, 36/12, it yields the gear ratio of 3.00:1.....meaning the driveshaft will spin 3 times for every complete tire rotation. Division is the only way to figure it.

 

Can someone check if the gear ratio calculator (RPM, MPH, Tire Diameter and Final Drive Ratio) on this website works.
http://www.parkercarburetion.com/calculators.html

 

Yes, that works fine for calculating final drive ratio.....which is when you multiply to calculate the total gear reduction through the tranny, rear end, etc. and loss of reduction by running larger tires.

I'll tell you what, don't take my word for it, check this site and numerour others on how to calculate the rear end ratio by counting the teeth on the ring and pinion and DIVIDING. It's basic math.....

http://www.csgnetwork.com/rnggrpinioncalc.html

 

oh ok i worked out what i was doing wrong. I was putting in kph not mph. Thanks anyway '92.

 

I have the 4.10. I climbed under and sure enough it said 4L10. What code would that be if it was on the door tag? Just for general knowledge.

 

I have the 4.10. I climbed under and sure enough it said 4L10. What code would that be if it was on the door tag? Just for general knowledge.

The axle code is either 2 or 3 digits (two wheel drive is 2, 4x4 is 3 digits to cover the front axle as well)

For your truck, 4.10 limited slip,

B5 5300 lb rated 4.10 limited slip
C5 6250 lb rated 4.10 limited slip
D5 7400 lb rated 4.10 limited slip
F5 8250 lb rated 4.10 limited slip

If there is a third digit (2) then the front diff is limited slip as well.

Dave / Believer45

 

oh boy the things i could do with a set of 4.10 gears.

*351w closes eyes and makes wish*

 

And what would you do with a set of 4.10 gears. Slap me with them?

 

Thanks for that Believer

 

well 89 thats not a thought that had crossed me mind until now so thanks.
actually i was thinkin my truck would probably run pretty good with a set of 410's and that limited slip sounds great as well.
i have one of those lockers installed in my rear and it makes all kinds of noises.

 

only downside with the 4.10s on my setup is fuel economy. On the highway at 60mph, i'm doing just under 3000 rpm. But it does have a lot of get up and go though.

 

yea i got to agree 410 is not good for the highway and specially with 27" tires.
now if you add 31" tires to your list then your rpm's will come down some and your wallet will be lighter.

 

31's would bring it down to around 2500. i guess thats reasonable