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Does it fit to jeep kj ( liberty) 2003 year model 3.7l petrol?
Yes, the EATON 19818-020 Performance ELocker™ will fit the front axle of a 2003 Jeep KJ Liberty 3.7L 4WD, provided it meets the axle and gear ratio requirements.

Here are the key fitment details to verify for your specific vehicle:
Axle Type: The 2003 Jeep Liberty KJ uses an aluminum-housing Dana 30 front differential (independent front suspension), and this locker is designed specifically for standard 27-spline Dana 30 front axle shafts.
Gear Ratio: The -020 part number suffix is specifically engineered for 3.73 and numerically higher gear ratios (such as 3.73, 4.10, 4.56, etc.). (If your Liberty has a 3.54 or numerically lower ratio, you would instead need part number 19817-020).
Where is the recommended placement of the shims for this carrier? In between the bearing and carrier, or between the bearing race and axle housing?
The shims should be placed between the bearing and carrier, not between the bearing race and axle housing. Thanks for your inquiry.
What is the part number for the shim kit? I know that standard shim kit will not work do to the larger ID of the bearings .
The shim kit is a part of the Master Installation kit suggested for this locker's install.Master Install Kit with Shims Thanks for your inquiry.
Does this locker require a special set of bearings? If so, what is the part number?
Bearing LM102949 and race LM102911 are the part numbers, they would have to be ordered over the phone with Quadratec part numbers 52421 1001 and 52421 1002. Thank you for the question.
Is there a different locker for the front axel or does one fit for both if I buy two of the same
This one is for the front Dana 30 Axle. The rear axle will be a different application. Thanks for your inquiry.
What EATON Performance E- Locker™ Will fit a 2020 Jeep "Gladiator" With A Dana 44 Thanks Bill
At this time, Eaton does not have an ELocker for 2020 Jeep applications. It is on their list so hopefully, they will have one out shortly!
Does this come with switch and wiring?
Yes a terminated wiring harness and rocker switch are included. You will need to provide a location to mount the rocker switch.