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Gearing question

792 views 7 replies 5 participants last post by  RWKHausSupply 
#1 ·
Still being a newbie, is there any iron clad way to tell what gear is actually in my rig.
I was told by po that I had a 456, but a lot of people are telling me that's not a common gear?
Any help greatly appreciated
 
#2 ·
Courtesy of Hose Jockey

A couple of options:

1. Open the diff and count the number of teeth on both ring and pinion and do the math.

2. Jack up the rear axle so the tires are off the ground. Mark your tire and your driveshaft so you can count the number of revolutions.

I have 4:56 gears. When my tire turns one full turn, the drive shaft spins ~4 1/2 times...so if you spin yours and it goes around ~3 3/4 times, then you have 3:73's....a little more than 4 turns then you have 4:11's.
 
#5 ·
Put a mark on your ring gear with paint or maybe a crayon or paint pin at one of the teeth. Start counting teeth and rotate around as you continue to count until you get to the mark again. Then do the same for the pinion gear (not as easy since it's buried in the housing). Then divide the number of teeth on the ring gear by the number of teeth on the pinion and you will have the ratio. 4.56 is probably 41 teeth on the ring gear and 9 teeth on the pinion but could vary depending on the gear set you have.
 
#6 ·
Also, depending on the gear set, it may have a mark on the ring gear on the side that faces the cover that would be like 41-10 or 41-9. 41-10 would represent 41 teeth on the ring gear and 10 on the pinion which equates to 4.10 ratio, etc. But still the most accurate way is to count the teeth on both gears and divide the large number by the small number. As far as I know, the only TJs that came with 4.56 gears from the factory was an 03-06 2.4 4 cylinder with a manual transmission and this was an option. However, 4.56 is a common regear ratio when going to larger tires so you may have 4.56s.
 
#8 ·
This.

Never seen a ring gear that did not have either the part number (aftermarket) that has the ratio in the last 3 digits. Or stock gear with a ring gear and pinion gear tooth count. for example a "41 10" as the last digits. which = 41 ring gear and 10 pinion gear teeth. 41/10 = 4.10, or what ever your has stamped/etched in to it.
 
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