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Re: Sbc vibration at 3000 rpm
A driveshaft imbalance could damage the rear bearing/seal in the transmission, but if the vibration occurs at the same approximate engine speed in all gears it's from your torque converter forward.
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Alex V.
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1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs.
1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.
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