how to replace rear main seal
It's a very labor intensive procedure requiring you to remove the transmission. Are you up for the task? Search a couple Nissan Pathfinder forums, you might find a DIY.
Not for the meek and a job of that magnitude may justify another engine replacement ... One things for sure ... it's much easier to work on an engine outside the truck. The essentials are a good support with hoist.... options should include, a heater, milk crate and good CD player Good Luck
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