Also, clean the threads of any oil and use red Loctite on the pinion nut. This is especially important if you are reusing the crush sleeve, as the crush sleeve usually takes in excess of 200 lb-ft of torque on the nut to compress. If you don’t come close to reaching this torque on the nut, you will not crush the sleeve far enough, leading to potential failure of your ring-and-pinion. Over tightening comes with its own problems, such as premature bearing wear or failure. With Loctite, you are ensured that the nut will hold the preload and won’t walk off the threads on a marginal install where the sleeve wasn’t crushed enough.