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Grannys Tranny Sm465 Transmission Upgrade Sm465 Transmission

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The SM465 is heavier by 40 pounds, only has a low gear of 6.55:1, and is 11⁄2 inches longer than the SM420. However, it was available up to 1991, and where the SM420 uses a 4-inch adapter Advance Adapters offers a new output shaft and a 7⁄8-inch adapter so the overall package ends up 15⁄8 inches shorter. The front output of the transfer case has more clearance for a larger front driveshaft with the SM465. You will have to decide if the gearing or the length works best for your project.

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