Rt side is stock 3.55. Left side is new 4.56





Why is new one so tiny? Any one else run in to this. I did order thick set gears to keep from changing carriers. And the new ring gear is thicker than old is that why? Its what i am assuming

 

It's smaller because there a fewer teeth on the pinion gear. That is how the gear ratio is determined. Number of teeth on ring gear divided by number of teeth on pinion gear equals gear ratio.

 

The pinion has to spin on the ring gear faster to reduce the ratio. If it was the same diameter it would soon the same speed. So reducing the diameter is what makes it spin faster so the ring gear must be thicker to make up for it.

 

Well the reason i mainly ask is the when i had yhe dana 30 out both were the same size just different gearing.

 

I called it is cause i did the thick gear set. I knew what yall said disnt make much sense.

Thanks for the attempt though.

 

This thread made me lol.
Stryker you are correct. The higher the ratio the smaller the pinion gets.

 

Actuallt what they said makes perfect sense. The thick gearset has nothing to do with it. Thick gears are made so one could run lower gears without getting a new carrier.

 

 

nm

 

I called the compnany. If i would have went with a new carrier and every thing. Then the gears would have been roughly the same size just different tooth pattern I ordered thick gears to save money there for the pinion gear is smaller.

I did not intend on this becoming anytype of flamefest.

Thanks for all the answers.

 

The pinon on the 3.55 is only 2 teeth less than the 4.56.

 

. Its not a flamefest. The thick gear only changes the size of the ring gear on the back side.

The pinion is smaller because of less teeth use dfor the gear ratio change.

Its no different than any other axle including the d30.

Ive got probably 20 different R&P sets with different ratios i can take pictures of to show you.

Try putting a a 3.55 pinion next to a 4.88 pinion.

 

LOL, think about it. Whether is has 3 or 20 teeth, the speed it rotates is still the same as long as the diameter it the same. The diameter has to decrease to increase pinion speed. Which is what you are doing.
The "thick" gear difference is only the distance from the tooth face to the mounting surface of the carrier side. The pinion would actually be identical, Just the "thickness" of the ring gear changes.

 

Here, this is the easiest way to think about it.
Think of the pinion as a tire and the ring gear as the road. The smaller the tire the faster it turns down the road.
Now you put a tire on that is larger in diameter. It turns slower, thus giving you a higher ratio. (numerically lower)
It doesnt matter if the is a mud terrain or all terrain, the diameter of it is whats effects your final ratio. Same thing. Small tire Turns more in the same distance of road than a larger tire.
Small pinion turns more rotations on the ring gear than a larger one. Theres your ratio.

 

The pinion has to be smaller to support a fatty ring gear...