Here is a flir image of my diff after a short little highway trip. The hottest part of the diff cover was 120'F about 5 minutes after I parked it, then in the 3 or 4 minutes it took to find the flir SD card the rear had cooled an additional 6 degrees F.
Looks like all the heat is concentrated around the ring, pinion and diff, you can even see where the level of the fluid is.
In the past the hottest reading I could get with a simple inferred scanner on a diff was about 145'F after I had parked the vehicle.
The nitrogear diff cover was $180 shipped (not installed when this thermography was taken).
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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