2003 Mustang GT Rear Diff Fluid?

Messages
65
Location
Raleigh NC
I'll be changing the fluid in my 03 Mustang GT's rear diff next weekend and I'm having trouble finding the right weight. My manual says 80w90 or 75w140 and doesn't really specify a reason for going with one or the other. I've read a few posts on the various Mustang forums with differing opinions on which one to go with but I don't really trust anything oil related I read there. I realize either weight will likely work fine but was just wondering if anyone with an SN95 had any experience running both. The vehicle is an 03 5-speed GT convertible with 55,000 miles on it. It see's mostly very light use but (obviously) occasional fun.
 

10cent

Thread starter
Messages
65
Location
Raleigh NC
Yeah I figured I'd end up going with the 75w140. I did our 2006 Mustang GT a few weekends ago with Redline 75w140 which is the only weight called for in it's manual.
 
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