Differential Temp - Impala Tech
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post #1 of 5 (permalink) Old 09-15-2016, 07:26 PM Thread Starter
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Differential Temp

How hot is a normal temp for a differential with 3:36 gear ratio? I have a 67 Impala and it feels quite hot, but no noise. What would be the very best gear oil and would a differential cover with fins help?
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post #2 of 5 (permalink) Old 09-15-2016, 07:44 PM
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85W gear lube is what I use. Valvoline brand name, with additive installed if I have a clutch type Posi (vs. a Detroit Locker that is all gears and springs, and has no clutches).

The cast aluminum cover with fins will help a little in shedding heat.

NASCAR actually employs a cooler with a belt driven oil pump to circulate the differential fluid while racing it can get so hot it breaks down on a leisurely Sunday afternoon drive.

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post #3 of 5 (permalink) Old 09-27-2016, 04:19 PM Thread Starter
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I installed a B & M differential aluminum cover with the fins. It holds 16 oz. more oil. Took it for a 20 mile ride at 70 - 75mph and what a difference. I could keep my hand on the housing.
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post #4 of 5 (permalink) Old 09-28-2016, 04:40 PM
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I've seen a few references to 230 degrees as a maximum. (that was supposedly Fords max regarding Mustang IRS)

Here's another reference that says 180-230 degrees - Amsoil Tech Bulletin - go to page regarding Automotive differentials.
http://www.thebestsyntheticoil.com/p...ferentials.pdf
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post #5 of 5 (permalink) Old 09-28-2016, 08:48 PM
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All dead dino based oils start to oxidize at 230 to 260 degrees Farenhieght, but the ignition point is a lot higher. For those that read SciFi you know that paper catches fire at Farenhieght 451 according to Ray Bradbury's research. Oil will be close to that ignition point as well.

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