Check the gear contact pattern using a marking paste and increase or decrease the shim pack in the case, behind the rear pinion bearing cup until proper gear tooth contact pattern is reached. The service manual has very good pictures of what the pattern should look like. Backlash and preload will have to be reset after each shim pack change. It is time consuming but must be done. A few thousands of a change in the shim pack will change the tooth contact pattern a lot. Go Slow and get it right. Note: if you put the pinion depth shim pack behind the bearing cup in the case, when you increase that shim pack, increase the pinion bearing preload shim pack the same amount and your pinion preload should stay the same. If you decrease that shim pack, decrease the preload shim pack the same amount and preload should stay the same.
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