It's a 10 bolt 8.5 no full throttle vibration anywhere in the rpm range ,its just on deceleration from 135 mph( the fastest this car will go)down to about 110mph with just engine braking.When feathering throttling the vibe will come and go at high speed.Ill recheck pinion angle and post results.I have noticed slight gear wind when just cruising at constant speed the noise goes away with adding slight throttle or engine braking.
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119
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