Join Date: Mar 2010
Location: Stoney Creek, Ontario
Probably should, at the very least, drain and refill the diff. Gear oil with friction modifier does wear down. Probably uses 75w140 synthetic w/modifier. I haven't looked up the particulars, though.
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The Past - 1976 F-350 Crew Cab 1992 - 2006 RIP
The Past - 1995 F-150 XL Enforcer All Gear Drive 2008 - 2015
The Present - 1993 F-250 XLT Turbo Diesel Super Cab 4x4 2015 - ?
The Future - Who knows?