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A new output housing is necessary with JB Conversions' short-shaft kit. The two bottom housings are from NP241s. The housing on the bottom left is a standard GM version with a magnetic pickup for the speedometer; the other is a custom JB Conversions housing that fits a fixed-yoke kit onto an NP241. The housing at the upper left is used with the JB short-shaft kit for NP231 cases; the one on the upper right is a standard TJ housing.