Quote:
Originally Posted by Hib Halverson
(edited)
Gears in the early ZF S6-40s have a slightly smaller helix angle and that's why the early transmissions are a little more noisy and have a little higher input torque rating.
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Regarding the ZF S6-40 ZR-1 Transmission.......I find that that the smaller helix angle (of the gear teath) attributing to a little more noise and higher input torque rating is of technical interest and worth documenting........
something not described before 
