I couldnt figure these out on my own, sooo....
Front, 3.00 9 S316B
Rear, 3.00 E1TA F6
The door tag says 14 for axle.

Could that be 3.00 ratio? I thought all they had was 3.08, 3.55, or 4.10.

 

3.00 ratio it is. Seeing how you have an 82 bronco then it came with a 9 inch rear axle and that's what the 9 inch ratio is, 3.00. the front ratio is usualy off by a couple points. This is why it's not a good idea to drive on dry pavement.

Do you have a full time case?

 

Part time np208
I can't find the 14 door tag code anywhere.
I always thought I had 3.55s cause the truck takes off good off the line with the 33s.

 

Unless you have a TON of hp and torque you're not going to take off quickly with 33's and a 3.55. I have 31's with 3.55's (92 stock 302) and it's pretty much a slug.

Biederboat

 

Thats why I think the tags are wrong cause I have all paperwork from old owner and he never had the gears changed. It takes off like my 83 did with 3:55s

 

Anybody know what the axle code for 14 means on the door tag?

 

Well, I jacked up 1 wheel and marked the driveshaft and tire and spun it. The drive shaft makes 1 1/2 rotations per 1 wheel rotation. How do you figure a 1 1/2: 1 ratio.
I also made sure to jack up the axle at one side so as the other tire did not spin the opposing way.

 

BRK, if you have an "open" differential, you need to rotate the tires 2 (two) times around and divide by two to get the ratio, with BOTH wheels off of the ground. If you have a 3.00:1 ratio, that's 6 revs of the driveshaft for two of either tire. In any case, a code of "14" is proper for the Ford 9" rear axle with 3.00:1 gear ratio. That is also an "open" axle, or in other words it has no factory limited slip as in "H4" or "H6". BTW, I'm still watching out for you!!! JSM84

 

I don't quit get what your saying spinning the shaft, also I thought with both wheels off the ground then if the other tire spins the other way it would give you a false reading.

Well, the truck runs and takes off like my 83 did with the 351 and this new 351 takes off even faster.

 

BRK, with BOTH wheels off of the ground, turn one wheel by hand two complete revolutions. IT's true that the opposite wheel will turn the opposite direction from the one you're turning, indicating an OPEN differential. Just count the number of rev's of the driveshaft for two complete turns/rev's of either wheel. Then divide by two to get your gear ratio. Six rev's of the driveshaft divided by two turns of a wheel equals 3:1 ratio, seven rev's divided by two equals 3.5:1 ratio. The false reading comes when only one tire is in the air while being turned. I've used this formula many times and it works. Give it a try!!! I've also looked at your gallery before and must comment on the 351W install you've done. Nice job!!! JSM84

 

well, I jacked up the whole axle and spun 1 of the tires but the other tire still did not trun and with spining the tire twice, I came out with 3 revs on the driveshaft.

Also, thank you for the comment on the engine. It makes me feel good that other people like my handy work.

 

Hmm, you got me stumped now!!! Did you try turning that one tire clockwise 2x then counter-clockwise 2x??? I'm puzzled why the other tire wouldn't move. Try turning the driveshaft 3 turns, and count the revs of that one wheel. It's much harder to turn than a wheel, but you can see whether or not the driveshaft is moving both of the axleshafts and tires, rather than you putting force on one wheel on the end of one axleshaft. You can also try the same procedures on the front axle, as it should also be an "open" differential with the same or similar ratio.

 

Well, I also asked this in the tranny and diff forum and a guy said when 1 wheel is turned you have to spin it 2 times cause the spiders walk and the carrier only makes half a rev for 1 rev of the tire. That means you were right on that you have to spin the tire 2 times.
Also, if I jack up the front, and spin 1 wheel the other spins opposite and doesent turn the driveshaft.
He said it is 3.50:1 ratio but I don't know how that is figured from 2 to 3.

 

I already answered your question in the axle forum, but you have a 3.00 ratio. Check that post out for the detailed version.

 

oh yea, thanks.