2010 JK Unlimited rear axle shudder
Today, 06:18 AM
#1
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2010 JK Unlimited rear axle shudder
Hey all,
Just picked up a 2010 JK Ultimate Sahara with 140k wiles 3.8l auto trans so I don't know the history of it. As seen in the attached video, I have a shudder in the rear axle in 2WD only when accelerating anything more than a mild launch. It drives normal otherwise at any speed or shifting. There is no other unusual noises out of the rear end other than the shudder. I replaced the stock driveshaft with a double cardan driveshaft and also replaced the rear shocks. I also pulled the trans pan and changed filter and fluid. I didn't find anything unusual in the pan or old fluid. The shudder is still present but seems to have decreased somewhat. Here is the jeep's setup as far as I can tell: 4" ProComp lift. Dana 44 limited slip rear axle. 3:73 ratio. 35" Nitto tires. Measured about 1 degree rear pinion angle. Next step is to pull the rear diff cover and take a look around. I'm sure the clutches for the LSD are shot but don't think that would cause this issue.
Just picked up a 2010 JK Ultimate Sahara with 140k wiles 3.8l auto trans so I don't know the history of it. As seen in the attached video, I have a shudder in the rear axle in 2WD only when accelerating anything more than a mild launch. It drives normal otherwise at any speed or shifting. There is no other unusual noises out of the rear end other than the shudder. I replaced the stock driveshaft with a double cardan driveshaft and also replaced the rear shocks. I also pulled the trans pan and changed filter and fluid. I didn't find anything unusual in the pan or old fluid. The shudder is still present but seems to have decreased somewhat. Here is the jeep's setup as far as I can tell: 4" ProComp lift. Dana 44 limited slip rear axle. 3:73 ratio. 35" Nitto tires. Measured about 1 degree rear pinion angle. Next step is to pull the rear diff cover and take a look around. I'm sure the clutches for the LSD are shot but don't think that would cause this issue.
Today, 09:36 AM
#2
Super Moderator
Welcome to JKF. Your issue with my estimate is driveshaft angle and that horrible lift height. 4" is not even required for 37" tires!! You need about 4-5 degrees down on the pinion angle. Not sure if you have adjustable control arms but for me it was simple as I have MC lowers. Also seems like a lot of diff wind up there for a 3.8 and the specified gear ratio. Don't forget to grease the center zerk on the CV every 3500miles or so. I do mine mid-point between oil changes as the Chev goes 12000kms oil change.