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Old February 15th, 2022, 03:59 PM
Prowbar Prowbar is offline
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 305E, SM420
Posts: 187
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Default Re: Drivetrain noise

Originally Posted by James View Post
Should be using this:

GL4 has too much sulfur in it and will eat up the brass synchro. GL5 is worst.
Do you use this oil in your SM420? How does it shift?
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