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Why Doesn't the Automatic Transmission Move When Shifting to Reverse and Accelerating?

2 Answers

EliLee

07/28/25 4:04pm

First, check the condition of the two rear wheels. If both rear wheels are thrown out, it may be due to a broken axle sleeve or the wheel hub bearing lock nut coming loose. If everything appears normal, the issue should be diagnosed based on the behavior of the driveshaft when shifting gears and starting. Here are several scenarios related to the driveshaft: 1. If the driveshaft rotates but the car doesn't move, the problem lies in the rear axle: Jack up the rear axle and rotate one rear wheel. If the driveshaft doesn't turn and the other rear wheel rotates in reverse, it indicates that all the rivets of the driven bevel gear have sheared off. If the other rear wheel doesn't rotate either, the half-shaft should be inspected for breakage. 2. If the driveshaft doesn't rotate when the transmission is in a specific gear after starting, the issue is in the transmission: Remove the transmission cover and check if the shift fork is broken or if the guide block fixing screws have come loose. 3. If the driveshaft doesn't rotate in any gear, the problem is with the clutch: Check for severe clutch slippage, whether all the spline teeth rivets of the clutch driven disc hub and steel plate have sheared off, or if the steel plate is fractured.

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LeHolden

08/11/25 11:08pm

I've also experienced the car not moving when shifting into reverse before. Later I found the most common cause is still that the small gear lock isn't fully released. It's like having an iron rod stuck in the wheel - no matter how hard you press the gas pedal, the engine just roars uselessly. I remember that time when I looked down and saw I'd forgotten to press the release button next to the gear lever. After pressing it with a 'click' sound, the car could move. Another possibility is poor contact in the brake pedal sensor - this happened to me after water got into the wiring during car washing, and I clearly didn't hear the transmission's 'clunk' engagement sound when shifting. If these aren't the issues, then you might need to check the valve body or torque converter in the transmission. Once a mechanic used a computer to diagnose that the torque converter's lock-up clutch was stuck.

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