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131 0201 Gear15 Z

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15 Pinion depth is what you should worry about first, and without a pinion depth tool the only way to find out if it's right is to perform a trial fit and check the pattern. Per Randy's recommendations, you should install the pinion without the crush collar and seal (we accidentally installed the new seal--oops) but with the companion flange and old nut, then tighten the nut until the pinion drag matches the final spec (8 in-lb in this case). This will give you an accurate setting without ruining the crush collar, which is one-time-use only. If you're lucky enough to get it right the first time you'll still have to take everything back apart, but the idea here is to hope for the best and prepare for the worst.