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Q: IRS leak on one side on 1990 Ford Thunderbird SC

Leaks on one side only between wheel and center
there is also a small thump when starting out.
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Obviously the leak needs to be stopped first and foremost. Sounds like an axle seal. The thump could be anything from a mount that's worn to a universal joint issue to a ring and pinion issue. A good inspection will figure it out.
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