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Originally Posted by XRQTOR
I have never heard of anyone cooking their diff, but i did notice the cover plate on the BF diff has flutes for cooling where the ba diff doesn't.
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It is quite common with those who travel at high speed and corner. It is not a problem on drag strips.
When I ran into the Ford/FPV development engineers in 2003 in NT (ah those were the days) the second question I was asked was did I have any problems with diff heat. (The first question was what did I think of the GT-P at high speed).
I personally have boiled my diff twice (that I know of) once at QR, once at Lakeside. The first time I boiled it was on a JB track day so I had a number of conversations with the JB crew and other drivers. 8-10 hot laps or so is all that can be done. It also seems to be worse with stickier tyres.