Originally Posted by jorb
H-M and Manual trans. torque tube measurements.
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Torque tube length (and, Propeller shafts) are different lengths. .
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I think that is the only difference between the H-M and Manual trans. torque tubes
That is correct.

We converted a 1954 3100 H-M rear-end to 3.55 Ring & Pinion, using the standard installation/seal/bushing kit.