Gear change to 4.56

Idaho392

Well-known member
Joined
Aug 26, 2021
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Location
Idaho
Current Rides
2021 Rubicon 392, 2021 RAM 1500 Limited
Took my 392 into the dealer on 1/21 to have them install the gears that I purchased online (Yukon complete kits). It took them 2 days to get them installed, but now the rear diff is "locked" because there is apparently an "air gap" that needs adjusted?!?! Apparently Jeep doesn't even make the tool to do that, so they have opened up a "Star" case with the engineers for a solution. The gears are all installed and working properly, but the rear diff is permanently locked. Anyone heard of this?? I know several people on here have replaced gears without issue.
 
So... the highest level of support/engineers at Jeep couldn't figure out how to fix the problem. The solution is they are sending a brand new entire rear axle. More waiting... LOL
 
So... the highest level of support/engineers at Jeep couldn't figure out how to fix the problem. The solution is they are sending a brand new entire rear axle. More waiting... Lol
I had my 4:56 Dana Spicer gears installed by a shop that all they do are gears and axles. No problems yet thankfully
 
So... the highest level of support/engineers at Jeep couldn't figure out how to fix the problem. The solution is they are sending a brand new entire rear axle. More waiting... LOL
So I'm curious, aren't the axles the same as any other JL Rubicon? Wondering why you are having this issue. I've got Yukon 4.56 ready to be installed and you have me worried?
 
So I'm curious, aren't the axles the same as any other JL Rubicon? Wondering why you are having this issue. I've got Yukon 4.56 ready to be installed and you have me worried?
I have no idea why the issue. I know several other people have installed the Yukon gears with no issues.
 

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