The cause for that could be a low transmission fluid level, a faulty vacuum modulator or no vacuum to the vacuum modulator, A faulty front pump assembly or torque converter, a loose valve body or a blown out valve body gasket, the forward or direct clutch pack has lost line pressure to the clutch pack (could be a plugged up transmission filter) or the frictions are burned up in that clutch pack, or the governor has malfunctioned, usually due to missing or stuck governor weights, or a stuck valve inside of the governor, a small plugged up line filter inside the governor fluid channel under the valve body, and most commonly because of a plastic drive gear at the end of the governor that can crack apart or will have sheared off teeth on the drive gear.Ĭheck the transmission fluid level and inspect the vacuum line to the vacuum modulator for any damage and there should be full intake manifold vacuum to the vacuum modulator.
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