I cannot post anywhere else but I think this might help Strad.
From one dragster championship winner, junior mid 70s, to another.
The rear end on modern dragsters uses gearing that could be described as midway between a bevel set and a hypoid bevel set.
There is a great deal of in mesh slidding under very high load.
It has always been the practice to mix a friction modifier in with the thicker oil used in commercial high torque gearing and graphite is a good choice.
There is no problem in a rear end in regard to filters blocking or break down of oil film on shell bearings, there are non. However the axle does need to be checked and the graphite re-mixed, because it tends to fall to the botttom of the case.
Of course graphite would not be used in this way in an engine.
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