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Through some online research, I believe the previous owner of my car installed a 4.10 diff. I haven't had any luck in my attempts to try and reach him.
Is there any way that I can tell if the diff is still in the car or if it's been returned to stock?
I noticed that highway cruising RPMs are quite high in this car, but I've never driven a stock one, so I have nothing to compare to. Is there a noticeable difference in RPM levels from stock (like 65 mph in 6th gear should be XXXX rpm)?
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