Hi,

Can anyone tell me the maximum internal operating temperature of a rear
differential?

Reason I ask is that I'm plumbing the hose and bulkhead fittings for an
air locker in an XJ D44. The locker originally came from a Wrangler
Rubicon and I don't know what sort of tubing was used OEM. I could use
copper like ARB uses, but I'd rather go with oil-resistant nylon air
brake tubing. The stuff I have is rated to 200F, just not sure if that's
sufficient.

Thanks,

Steve