Whats causing my Transmission to thump?

Question

My transmission does a really aggressive thump/jerk movement whenever i accelerate. It does it mostly when i come off the gas to brake a little (or just coast) and then when i come on the gas again the whole vehicle will suddenly thump as soon as i touch the gas pedal. It will also do it sometimes when changing from R to D, it wont transition smoothly it will just bang into gear. I have had the Motor/transmission mounts checked and the u/joints, drivetrain etc, it all looks fine. Vehicle is a 97 LandCruiser - Prado, diesel Automatic.  Any ideas i would be grateful.

bo · Answer

find local shop at ATRA.COM. remember fluid and filter changes are a maintenance procedure. if a problem changing them won't take care of the problem let the shop do a quick diagnosis on it before you spend money on it

Anonymous · Answer

And you've determined that your transmission is at fault?

Amazing.

Take your Toyota to a real mechanic.

Anonymous · Answer

Change the transmission fluid (drain and fill only).  Issue does not go away, check for bad shift solenoids and speed sensors.  Check for trouble codes with a dealer level scan tool.

? · Answer

Transmission sauce might be lumpy.

Anonymous · Answer

Rear wheel drive? Probably a bad front or rear universal joint on the driveshaft.

? · Answer

Since you've had the mounts etc checked, the next thing is the transmission fluid.

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Whats causing my Transmission to thump?

6 Answers