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Why does my 2008 Nissan Dualis always break the O-ring in the gearbox shaft that goes into the torque converter?
A car that continually breaks the same component time after time probably has a bigger problem than simply the part that keeps breaking. It sounds like you need to have the transmission and torque converter checked for alignment and correct interface. Any problem with the way they fit together could explain why an O-ring keeps failing. Continuing to replace the O-ring won’t fix a more complex problem.
Either that, or the mechanic who is changing the O-rings is making the same mistake over and over again and not using the correct lubrication or fitting procedure.
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