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Old 11-28-2013, 09:36 AM   #10
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,230
The leeway in shimming is huge. The leeway in getting pre or post pressure face angle change helical gears is zero. I would read up on the helical gear pressure face angel change disston mentioned and make sure that you not only got the right one but that the other two already in there are the earlier PFA gears. To confuse the matter I swear I have seen newer late PFA gears without a X on them anywhere. You can barely see the difference IF you look closely. PFA is NOT the helical angle. They never changed that. PFA is about the shape of each individual tooth. I have seen the PFA's mismatched many times and they work just fine for a while. A couple of thousand miles is usually enough for mismatched gearsets to eat themsleves. They do make more whurring noise while doing it.
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