The MD ball joints were originally designed and manfactured by Mal Story as an answer to LR changing to a non servicable, non adjustable ball joint in the LR and RRCs. He later came up with the longer version when he was doing the bolt on portal boxes. That allowed for more link seperation at the axle to deal with the great forces the portals put on them. It just got picked up by guys doing spring lifts.
They are greasbale and adjustable. The bolt straight in and have the same stock taper


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