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Feb 21, 2021 | 10:09 PM

#1

Jared Williams

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Rear diff

Hey i’ve got a 2020 DRW f350 w 3.55 gears. I was looking in the manual to see what rear end oil to use and it all depends on ring gear size... Any chance i could find that out somehow. thanks

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Old

Feb 21, 2021 | 10:16 PM

#2

ford390gashog

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Joined: Jan 2004

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From: Brentwood,CA

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All the DRW trucks use the M300 axle.

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Old

Feb 21, 2021 | 11:37 PM

#3

bobv60

Fleet Mechanic

Joined: May 2011

Posts: 1,866

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From: Rainier OR

The M300 is 300mm ring gear so 11.81"

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