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I will try the chalk thing.
thanks man. Wish I would have known that months ago when I changed the diff fluid. lolSounds like its just not shifting out of 2nd.
You can jack it up and put it in neutral. Chalk mark the tire and driveline. Rotate both tires while counting driveline revolutions. Look for something like 2.29, 2.56, or 2.73 driveline rotations for 1 tire revolution.
Or better yet, service the rearend and read the numbers on the ring gear. It's probably way past due anyway.
I will try the chalk thing.