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FunFer2,
There is another way to verify what rear end you have. I have a chart that has tire diameter, speed and rpm's. While tachs and speedos can be off a bit it is just more info that might back up what you think it is. For instance 28" tire dia. at 60mph with the 3.31 rear in 4th gear 1/1, your rpms should be 2383. With the 3.73 rear end the rpms would be 2686. If your tire dia. is bigger or smaller let me know and I can give you the calcs... 27" dia. would be 2471 and 2785 rpm. I hope this helps.
John
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