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Old 11-02-2018, 05:36 PM
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2008 JK 4x4 Not Engaging

Hello friends! I am new around here, but I am happy to see so many dedicated Jeep fans out here!


For my 2008 Wrangler, I swapped the front axle with the same one. Mine was in an accident, and it had engaged in 4x4 before but after swapping it with another Dana 30, it refuses to go into 4x4. When I try to engage, its as if the passenger front wheel is the only active one and the rest of the car is dragging. Does anyone have any idea what the problem could be? I've been told it could be the transfer switch.

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Old 11-02-2018, 11:46 PM   #2
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Did you install the front axle with a different gear ratio from your rear axle by any chance?

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Old 11-03-2018, 08:38 AM   #3
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Do you know what year and type of transmission of the donor vehicle the new front axle came off of? (Or the part number of the new front axle if you ordered a brand new one?)
Is your jeep a manual or automatic transmission?

I imagine most of the Dana 30s ever made for JKs were 3.23 gear ratio, and the odds a Dana 30 being 3.23 increase the newer the jeep is. Manual transmission jeeps usually ship with lower gears than automatics.
In 2008, Chrysler was a bit less concerned with their fleet fuel economy numbers, so your jeep might have 3.73 or 4.11 gears in the rear.
Gear ratio is just the number of times the driveshaft has to spin around for your tire to make one full spin.
Transfer case splits power 50/50 to front and rear driveshafts.
If your rear driveshaft turns 3.73 times to spin the tires once, and the front driveshaft turns 3.21 times to spin the tires once, your front wheels would be spinning faster than the rear. That energy is going to go somewhere, hopefully towards spinning/chirping a tire.
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Old 11-03-2018, 10:57 AM   #4
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Old 11-03-2018, 07:34 PM   #5
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prob have 3.73 gears in the front. you will have to regear.
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