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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
24,252 Posts
I'm glad that you have it running well.
I thought that the sixes had the 7 1/4 and the V8's had the 8 1/4 rear axles.
The 8 1/4 is a fairly robust axle and should be able to handle it, if you have this axle.
A rear axle fluid change for maintainance services with a Synthetic 75W-140 will help. This is what we suggested for heavy-duty, trailer-pulling V8 vehicles. Always check and clean the chip magnet.
Noise is usually the first indication of trouble.
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