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Under the assumption you have a 3.73 axle, a 5 speed Tremec with .68 OD and standard tires (275/60/15) this is the following speed calcs in 5th on the freeway.
63 mph = 2000 rpm.
71 mph = 2250 rpm
79 mph = 2500 rpm
Your speedo should not bounce. I too had a bouncing speedo until I swapped out the original installed by the engine and tranny installer for a new one from Superformance referred to as gold in color.
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