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Old 06-12-2018, 11:46 AM
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Rockabilly Rebel is on a distinguished road
E53 knock sound

Hi guys,
I would appreciate any help please:
Driving the other night with only lights on (no heater or A/C) - parked it, get a knocking, sound. Turn off, turn on, lights clear.

Last edited by Rockabilly Rebel; 11-24-2018 at 06:42 AM.
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Old 06-12-2018, 12:14 PM
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I would check for trouble codes first though it sounds like transmission or associated issue. I would have an independent transmission shop do a thorough diagnosis. To be sure I didn't make the problem worse I would have it taken to the shop on a flatbed.
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Last edited by bcredliner; 06-12-2018 at 12:55 PM.
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Old 06-12-2018, 12:49 PM
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It could be transfer case or worn out gear in drive shaft.
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Old 06-12-2018, 01:07 PM
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I agree that it sounds like a transfer box/worn propshaft spline issue.

The noise you hear when you put it in Park is the park pawl ratcheting on the park lock gear because the output shaft is rotating. You should be able to tell because the park lock won’t hold the vehicle.

Phil
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Old 06-12-2018, 02:27 PM
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Take the harness connector at the transmission apart and check for corroded pins or contamination in the sockets. Clean thoroughly with electrical contact cleaner, coat with dielectric grease and reassemble. Reset codes and test vehicle.


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