Well, I bought some redline75w90-gear-oil.
Drained old, removed cover and inspected gears,
filled with Redline.....
No difference. Still noisy, actually, I can hear no difference.
I did notice that the noise is the same coasting in neutral, or under power, or at 30 mph and foot off the accelerator.
I will use the car for in town driving and tolerate the noise, until I can buy another 240 to part out. A used rear end sells for 300 to 500 dollars, and I dont want to buy one unless I know it is good. ( 240s are getting a lot harder to find. A non running 240 for a grand sells in about two days around here.)
Thanks for the tip though.
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