Taking Advantage of the
Versatile NP231 T-Case
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The weak point in the stock NP231 output shaft is on either side of the spiral speedometer splines (A). New heavy-duty shafts use a nylon sleeve that slips over a splined section (B) to drive the speedo cable. The top shaft is a JB Conversions short shaft, the middle is a typical TJ shaft, and the bottom is an NP241 truck shaft. View Related Article
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