I read somewhere about how to determine correct shims by markings on the ring & pinion but for the life of me, I can't recall where. The front R&P are marked as follows, what should I make of this?

 

You preload the pinion bearings, not sure what you are talking about preload on shims. The shims are used to make sure you get the ring and pinion matched right.

 

This is worth reading a few times before you start.

https://www.jk-forum.com/forums/jk-w...gearing-82262/

I think the numbers you are looking at are to show that the ring and pinion are a matching set?

 

Looks like suggested backlash on the ring at. .006. The 42 could be correlating to the ring/pinion tooth counts but i think that would be like 3.73s on a d44 is that what you have,im doubting it... Could also be another measurement of .042 but not sure on that im no master gear installer.

 

Once you get all the gears set up there is a total preload spec by using a torque wrench with a dial. You are checking the amount for force to rotate the pinion and the carrier with no axles. If its low you add shim in equal thickness to both sides to the carrier or vise-versa until you are in spec.

 

Thought the jks used a crush sleeve to achieve this effect


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The crush sleeve is for pinion bearing preload, which you tighten the pinion nut until you are in spec. Its hard to overdue the carrier perload once you set the backlash you usually add about .004 to each side