New Rear Gear Question
10/17/07, 07:38 AM
#1
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New Rear Gear Question
I am getting ready to install my 3:73 FMS gears in my 05. Question is when will I need to change the gear oil after the install and should I run non-synthetic as the break-in first or start with synthetic?
10/17/07, 08:57 AM
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Use synthetic, that's what Ford calls for in these cars with the limited-slip in there. Use some friction modifier along with the synthetic fluid and you'll be good to go. 
10/17/07, 02:25 PM
#3
FWIW, the shop that installed my gears is adamant against using synthetic gear oil. All they do is rear end work (for all kinds of vehicles), and they have a stellar reputation for high quality. See Tech Tip #2 here: http://sdgearaxle.com/_wsn/page4.html
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