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Old 11-24-2019   #2
Hib Halverson
 
Join Date: Jun 2005
Location: CenCoast California
Posts: 898
Default Re: Low whining sound from undercarriage

Quote:
Originally Posted by Paul Workman View Post
The 90s have straight cut gears in the ZF which produces some gear whine, especially in 1st and 2nd, I find (in my 90 as well).
(snip)


There are no "straight cut" gears in any version of the ZF S6-40.

Gears in the early 6-40s 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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Hib Halverson
Technical Writer
former owner 95 VIN 0140
current owner 19 VIN 1878
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