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Dana 30 gear change for 33s?

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Old 06-16-2010, 08:16 AM
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Originally Posted by Hammer002
I stand corrected - thanks Jeepin Dad, I do indeed have the 3:73 gears. Thanks for the catch there, will make a difference.
he knows everything about everything - drives me crazy I mean really, he has an 2007 X 2 door.... why would he memorize what an 2008 Sahara has??? who does that???
Old 05-20-2011, 12:18 PM
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Originally Posted by Jeepin Dad
I assumed you had a manual since you said you had 3.21s. You actually have 3.73s, all Sport and Saharas autos have had 3.73s since the '08 models. Not a problem regearing to 4.88s and since you have 3.73s you won't even need a new carrier.
Im going through the same questions right now, but mine infact does have 3.21s... I came accross a set of 4.1s that came out of a rubicon, would they work with my front axle since i only have a D30? What would i need to purchase in addition in order to install the 4.1s?
Old 05-20-2011, 01:21 PM
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Originally Posted by RMB2010

Im going through the same questions right now, but mine infact does have 3.21s... I came accross a set of 4.1s that came out of a rubicon, would they work with my front axle since i only have a D30? What would i need to purchase in addition in order to install the 4.1s?
Stock 2009-2010:

X = 3.21 gears
X with towing package = 3.73 gears
Old 05-20-2011, 01:31 PM
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Originally Posted by RMB2010
Im going through the same questions right now, but mine infact does have 3.21s... I came accross a set of 4.1s that came out of a rubicon, would they work with my front axle since i only have a D30? What would i need to purchase in addition in order to install the 4.1s?
The rear gears would work, the front gears would not.

So you would need:
A new carrier for that front D30
Front d30 4.10s
Sell the rubi front 4.10s
2 master install kits (regular install kits can be used on low mileage axles, but spend the extra money for the master kits with new bearings)

Wouldn't be a bad idea to:
Replace the seals
Add C Gussets

Depending on your offroad usage and future tire plans, consider:
Add inner and/or outer sleeves
Add Control Arm skids
Traction devices
Moving past 4.10s to ? (depends on future tire size)



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