Quote:
Originally Posted by Bill Edgeworth
Dion,
There are a few issues with this conversation. First off you really cannot take anyone’s advice on what to use in your combo unless they have the exact same combo right down to surface treatment on the gears. Where ATF may be the best choice for lets say a 4 cyl FWD 200 horsepower stocker its certainly not a good choice for some blown 900 horsepower new stocker. Its all about the pressure and surface speed on the gear faces. Best thing you can do is just try a few different oils and figure out whats best for your circumstances. You do not even have to rely on a time slip to do this. Just measure the differential temperature before and after a run. You can use a heat gun or a more accurate measurement can be taken but using an eye type thermocouple under one of your cover bolts. The fluid that causes the lowest temperature rise in a run is what’s best.
For those that want to use a heater it can easily be temperature controlled with the thermocouple under one of the cover bolts and a digital control. For me this is what I used to do when I ran 75 weight oil. The last couple years I have been running the Red Line super light and have no need to heat it
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Bill I know of some 1400 HP FWD cars that use ATF in their differentials They have a 170 plus trap speed.
Could be the gears are cut differently (Not Hypoid?). But they use it I know.