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Grannys Tranny Sm465 Transmission Upgrade Locating Bore And Intermediate Idler Shaft

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The Spicer 20 case has a large, 4-inch locating bore and 1 1⁄4-inch intermediate idler shaft; some early 18s had a 3⁄4- or 1 1⁄8-inch shaft. The low gearset requires the 1 1⁄4-inch shaft, and our old case only used a 1 1⁄8-inch shaft. To use the TeraFlex gears you’ll either need to build a 20 case like ours or use a ’55 or newer Spicer 18.

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