Originally Posted by Hotrodz

No worries! Most the aftermarket diffs come totally ready to install and are plug and play. Especially the helical diff like Quaife and Wavetrac. In rare cases you may need to adjust the lash. Even the OSG I got needed no additional shims. I believe Cusco gives you and option of gear setup and shims. I know in clutch type they can be customized for power and traction but it really doesn't require any additional shims.

I am sure Rusty and others can elaborate on the particulars but you should be good to go.

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