Once you pull the pinion assembly out (carefully so as not to damage or mix up the shims) you'll need to separate the front flange to get at the pinion oil seal. Do this by threading 3 bolts into the holes provided and turn them in slowly equal in turns as best you can to part the flange. When you're done, clean the parts of old gasket/seal material and use a good quality RTV sealant to make a new gasket as they are no longer available. I found a cheap pulley wheel to use as a punch to drift the new seal into place. Worked perfectly.
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