Mercury Grand Marquis gets a rear gear upgrade from stock to locking diff Part 4

I spent the day Saturday working on GrandMa. 3.27 rear gears sure woke her up and I can't wait to get her tuned with a tune from Mo's Speed Shop. My 2004 Mercury Grand Marquis is finally getting some performance upgrades, rear gear swap Part 4.

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Jason Carr
220 Route 170
Oak Bay, NB E3L-3X8

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