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nodular rear 9" concern
Hi, I have a 70 eliminator 428 scj 3.91 4sp. I installed an auburn unit in place of the tired tracktion lock. I've never really payed much attention to the running temperature of a rear differential until now. It seems awfully warm after running 50-55 mph after 10 miles I stop and feel the punkin I can hold my hand on it but not for very long, seems to feel about the temp of my engine and trans is this normal? the exhaust goes out the back and mufflers and pipes aren't that close, I also should mention the rear performs well with no whine, I have about 300 miles on it now. I'm just a little worried about the heat, I used kendall 75W140 non synthetic and 1 bottle of addative, please advise thank you.
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I think it's probably normal . I had a '69 'stang with the CJ and the same gears, you are probably turning 3000 at 60mph (that's about what mine turned) and it does get pretty warm. You've also got to remember that heat soaks in after you stop,with some air moving under it it probably has a little cooling effect.
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Ed Cougar If you are worried about how hot the rear is, put some ducting on the center to move the air around. Where the rear is the air is dead with not much flow. You can always go like Nascar and add a cooler system to the rear. Get an infrared gun and check the temp after a 20 minute road test. If the rear is quiet I would change the oil, look for metal in the oil or drain plug, check for leaks, fill and HAPPY MOTORING. Make sure that it is filled to the correct level. Fill on level ground. Rick Lake ps a new rear and bearings take time to break in, couple of thousand miles. It is tight right now. Listen for noises is more important than how warm it is. Do you have backlash of .004-.008?? than it's OK.
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