Re: Truck Question
The only time I've changed mine is during a seal leak or noise. If your real curious pull the plug and stick your finger in it and if it smells rancid don't eat it,(oops sorry wrong test) :D. If it smells like hell it needs changing.
Check at 7500 and change at 30,000.
Careful though, be sure and identify what axle you got.
Some require different fluids. Get a book and verify.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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