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I replaced the OEM diff cover with the ford racing girdle before I took it into the shop. I've lifted the car and replaced the differential fluid. Here are some of the facts: There was approximately 2.1 quarts of 75w90 in the differential. Illustrating what the differential fluid looked like...

Good Afternoon/Evening/Morning everyone, I have had my 2011 GT auto rear end completely rebuilt after very bad howling/grinding/whining, you name it. Old 3.15 Gears were replaced with 3.31 gears, axle bearings, seals replaced too. One of the sounds aside from the diff howling was coming from...

I have been told that FORSCAN cannot change the gear ratio to have it affect your speedometer. I've asked in three different places but they all have said to get an SCT tuner to affect this. Unfortunately that's really all I know, I'm having the same issue, except I went from a 3.15 to a 3.31.