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Old 03-17-20, 11:33 AM   #1 (permalink)
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Automatic Transmission problem (91 AT coupe) - slips into neutral

Hello, Legend owners. I need your help. I own a 91 Honda Legend Coupe 4AT and there is issue with the transmission. My first transmission got badly damaged so I swapped it for a repaired one (clutch packs etc.)

Symptoms: Transmission slips out of gear. There are two scenarios:
First scenario: Whilst going at low speeds or coming to a stop: the shift between 2nd and 1st gear makes it slip into neutral and the only way to get it going again is to stop and shift to R and then back to D4.
Second scenario: I am going roughly 60mph and I need to overtake - when there should be a kick down 4th into 2nd gear the transmission slips out of gear. If I let of the gas slightly it comes back to gear.

There are no error codes on the dash. Transmission fluid is clean, no particles. The slippage is not dependant on the oil temperature. Both scenarios do not happen every time.

Repairs: I have replaced VSS sensor, changed oil, transmission mounts, cleaned the electro-hydraulic system of the transmission (shift solenoids) - Ive also tried a spare one, repaired the torque converter. Filter has been changed. Lock-up solenoids (TCC) were changed. Clutch packs were repaired.

Still no dice and I am getting a tad desperate

Ideas what might cause the problem: main-shaft and counter-shaft sensors, loose kick-down cable, bad kick-down solenoid, throttle valve, badly plugged connector (throttle position plug), bad power train controle module (PCM).

Do you have any suggestions what might cause the issue? I would be immensely thankful for your help.
- David
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