Why in the world would you get a re gear quote from a dealership? There are junkyards for trucks too. How much it costs depends entirely on what axle you have, what ratio you want and how common it is. Re gearing itself is easy. pull the axle shafts on each side (access by removing bolts on hub.) then attach chain and hoist to axle center section. Remove bolts that attach differential assembly to axle housing. Remove Diff. Replace with another assembly of your ratio choice. this is all bolt on. You are pulling out and exchanging entire assemblys so no need to worry about setting up proper gear lash and mesh pattern. Junkyard diff for my bus is $1k exchange. Your price WILL vary.
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