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Q:

my transmission slips after 20 to 30 miles of driving . fine first start out. on 2004 Honda Pilot

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
.first start out runs fine
(1) Answer
Saw your other post first ...still same recommendations. WAS second gear recall done ? That would be why an external in-line filter would be on it down by the cooler.