Thats just another thing I dont really like about Chiltons...get a Haynes manual(I have both, and I hate the chiltons index)...it talks about how to replace that rear output seal, as well as others. I am getting ready to do mine also. I have a model 20 and once the nut is off, should be able to knock the yoke off with a soft hammer to get to the seal...I dont think (or dont expect) it to be a very difficult job.
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JK
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78CJ5 360
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JK
O|||O
78CJ5 360