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If the transmission goes to shift into 3rd gear and just neutrals, it is an internal problem not a solenoid. With a no 3rd or 4th gear complaint I would bet that you have lost what is referred to as the 3-4 clutch. HTH Vince
my 4l60e in third gear loses acceleration but it doesnt drop into like a neutral but no matter how hard i press the pedal unless i stomp on it it hardly gains rpms. Even when i stomp on it it hardly gains speed.