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the delay is caused by worn reverse clutches.these are the main wear items in a 722.3 trans.as the thickness of the complete clutch pack gets thinner the large piston on the back of the front pump has to move further and further back to engage reverse.this probably accounts for the strange noises you heard.the problem can be fixed without tearing the whole trans apart,although it does have to come out.most shops don't want to do this in case something else starts to leak or malfunction after replacement as they usually get blamed.
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