Which Set Of Gears Makes Your Gear Ratio?

[66rmack]

I hate to bring up a old thread but is there a chance someone has a gear chart they could post? I am trying to figure out if I can use some of my old parts to help a friend out.

[Vladislav]

Math should be applied to figure out final ratios.

One of the posts above explaines how to do it.

A while back I found the top set gears (bewel ones pinion and the ring) teeth numbers somewhere on the net. For CRD92/93.

As you can see from the below every upper gear set provides multiple carrier ratios. This is because of different lower (bull gear) sets.

 

13x17:     4.50, 4.76, 5.13

14x17:     3.86, 4.17, 4.42

16x17:     3.65, 3.87

13x19:     4.46, 5.02, 5.32, 5.73

13x21:     5.55, 5.88, 6.34, 7.00, 7.13

 

Unfortunately bull gears were not explained where I got the numbers from. But using math you can get those secondary (lower) sets ratios. Not the gear counts though but ratios.

For example: 14x17 teeth set ratio is 17/14 = 1.214. It is used in 4.17's. 

If you divide 4.17 by 1.214 you get 4.17/1.214 = 3.435. This is the ratio of the bull gear set of 4.17 carrier. If you know the teeth count for one of those bull gears you could get the other one's. But I don't.

Now look for 5.02. It has 13 and 19 teeth in the upper set. 19/13 = 1.461. Than dividing 5.02 by 1.461 we get 3.436. This is the same figure as we got at 4.17 count (the difference between 3.435 and 3.436 is math roughness because I used limited number of digits after point.) So we determine by that 4.17 and 5.02 carriers have similar bull gear sets. 

[66rmack]

22 minutes ago, Vladislav said:

Math should be applied to figure out final ratios.

One of the posts above explaines how to do it.

A while back I found the top set gears (bewel ones pinion and the ring) teeth numbers somewhere on the net. For CRD92/93.

As you can see from the below every upper gear set provides multiple carrier ratios. This is because of different lower (bull gear) sets.

 

13x17:     4.50, 4.76, 5.13

14x17:     3.86, 4.17, 4.42

16x17:     3.65, 3.87

13x19:     4.46, 5.02, 5.32, 5.73

13x21:     5.55, 5.88, 6.34, 7.00, 7.13

 

Unfortunately bull gears were not explained where I got the numbers from. But using math you can get those secondary (lower) sets ratios. Not the gear counts though but ratios.

For example: 14x17 teeth set ratio is 17/14 = 1.214. It is used in 4.17's. 

If you divide 4.17 by 1.214 you get 4.17/1.214 = 3.435. This is the ratio of the bull gear set of 4.17 carrier. If you know the teeth count for one of those bull gears you could get the other one's. But I don't.

Now look for 5.02. It has 13 and 19 teeth in the upper set. 19/13 = 1.461. Than dividing 5.02 by 1.461 we get 3.436. This is the same figure as we got at 4.17 count (the difference between 3.435 and 3.436 is math roughness because I used limited number of digits after point.) So we determine by that 4.17 and 5.02 carriers have similar bull gear sets. 

Thank you for sort of  "dumbing it down" for me, I was trying to get a grasp on the way it was explained above. It having a hard time with it.  This made it a lot easier for me.

[Vladislav]

20 hours ago, 66rmack said:

Thank you for sort of  "dumbing it down" for me, I was trying to get a grasp on the way it was explained above. It having a hard time with it.  This made it a lot easier for me.

That's not that difficult if you have a bit of key info.

In a matter of helping your friend as you mentioned above you better remove big side covers on the carriers you have and count actual teeth. They are seem well from there. Then relate your counts to the figures I posted above and Bob's your uncle, as Britishes would say

[66rmack]

7 hours ago, Vladislav said:

That's not that difficult if you have a bit of key info.

In a matter of helping your friend as you mentioned above you better remove big side covers on the carriers you have and count actual teeth. They are seem well from there. Then relate your counts to the figures I posted above and Bob's your uncle, as Britishes would say

Well I guess I figured out why the one the one that was in the superliner that was messed up was messed up. 4.42 in the front 4.12 in the back. Is that even a Mack ratio? Well anyway that combo in aluminum splits the case. We found out the good parts I have won't help my friend out. That being said thank you Vlad for your info and thank you to all the rest of the people that contributed the previous info. Great info learned and stored in my rolodex.