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Unread 10-20-2013, 11:52 AM   #1
Dake
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Mixing Gears?

My buddy ordered gears for his TJ. He wanted 4:10s they sent him 4:11 for the rear and 4:10s for the front. They told him this will be Ok. I think they need to match? What do you think?

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Unread 10-20-2013, 11:59 AM   #2
biffgnar
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That will be perfectly fine. Very common for there to be a small difference based on how gears have to be machined to fit a particular axle. IIRC a general guide you hear thrown about is being within 1-2%. 4.10 to 4.11 is only 0.25 of a percent. Personally, I've run 0.5 of a percent difference and had no troubles.
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Unread 10-20-2013, 12:40 PM   #3
bpounds
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^ Correct.

I had a Ford truck that came from the factory with 4:10 and 4:11. You couldn't tell it without looking at the specs.
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Unread 10-20-2013, 12:51 PM   #4
Jonny Jeep
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It's perfectly fine. The difference is due to the amount of teeth that are on the ring and pinion gears.4.10s have 41 ring gear teeth and 10 pinion teeth. 4.11s have 37 ring gear teeth and 9 pinion teeth. You'd get more difference with having tyres that are slightly more worn on one axle.
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Unread 10-21-2013, 01:32 PM   #5
ridesno4llfe
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Just to add my knowledge on this. Its off .01 because the fronts have to turn. This allows them to compensate for the difference in speed front to rear letting the front turn a little faster
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Unread 10-21-2013, 02:48 PM   #6
biffgnar
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Quote:
Originally Posted by ridesno4llfe View Post
Just to add my knowledge on this. Its off .01 because the fronts have to turn. This allows them to compensate for the difference in speed front to rear letting the front turn a little faster
Running them exactly the same works just fine. .01 (and even a bit more difference) just doesn't make a difference. As previously posted the exact number just falls out from what gear sets will fit in what housing.
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Unread 10-22-2013, 02:02 AM   #7
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It does actually work better unless you have a tcase that allows changes (like a NV242 in 4 hi open) Locked cases will push the front around the corner otherwise.
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