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General E46 Forum
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Old 07-12-2014, 04:41 PM   #1
EmFiftyFour
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Clunk/Thud from Auto Trans

For a long time now, I've had a thud which has turned into a clunk over time when switching from P to D, and from D to R is the loudest. Tranny mount, a bushing somewhere, internal tranny issue? Got 167k on tranny, and other than this sound, shifts great. Never changed fluid unfortunatly, but too late now. Any advice would be greatly appreciated, thanks.
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Old 07-12-2014, 04:44 PM   #2
GDubois
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It's not too late to change the fluid.
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Old 07-12-2014, 05:44 PM   #3
swordsman11868
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I had a similar "thud".

Diagnosis: Royal Purple differential fluid in my rear diff had too many miles (35,000 or so).

Solution: New rear diff fluid from LiquiMoly.

HTH
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Old 07-15-2014, 12:12 AM   #4
EmFiftyFour
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Any other ideas?


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Old 07-15-2014, 12:27 AM   #5
EmFiftyFour
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Quote:
Originally Posted by GDubois View Post
It's not too late to change the fluid.
Yes it is. . Fresh fluid with it's detergents will dislodge crap built up from never changing the fluid, causing havoc within the tranny.




Quote:
Originally Posted by swordsman11868 View Post
I had a similar "thud".

Diagnosis: Royal Purple differential fluid in my rear diff had too many miles (35,000 or so).

Solution: New rear diff fluid from LiquiMoly.

HTH
Doesn't sound like my issue. I changed the rear end fluid 20k ago with Mobil 1 75w90 syn. Pretty sure I had this sound even before than just not as loud

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Old 07-15-2014, 01:07 AM   #6
yoyomin
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My guess is just the parking claw disengaging. If it's shifting fine I wouldn't worry too much about it. Nothing you can do except maybe to change the fluid if you feel comfortable to.
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Old 07-15-2014, 01:10 AM   #7
blingman
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when you park do you engage the parking brakes? I do to prevent the car from moving, if it rolls and locks the transmission, when you shift from park to reverse it will make a thump.
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Old 07-15-2014, 09:14 AM   #8
swordsman11868
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Could be a bushing as you suggested, especially with that many miles.

Have you done a visual inspection yet?

Also, if you can, put the rear on jack stands an watch/listen as someone else shifts from P to D to R. I bet you will be able to localize the cause.

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Old 07-15-2014, 09:41 AM   #9
HLG600
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Quote:
Originally Posted by EmFiftyFour View Post
Yes it is. Fresh fluid with it's detergents will dislodge crap built up from never changing the fluid, causing havoc within the tranny.
Not necessarily. Fluid changes don't break transmissions in good health. Just about all of the cases where this was claimed the transmission was on its way out anyway. But, I understand your caution.

As for your symptom, sounds like a transmission mount to me. If they're original, I'd be surprised if they weren't shot by now.
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Old 07-15-2014, 10:10 AM   #10
generalvp
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Is this sound similar to what I have in this video?

http://vid276.photobucket.com/albums.../E46_click.mp4
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Old 07-15-2014, 10:56 AM   #11
EmFiftyFour
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Quote:
Originally Posted by swordsman11868 View Post
Could be a bushing as you suggested, especially with that many miles.

Have you done a visual inspection yet?

Also, if you can, put the rear on jack stands an watch/listen as someone else shifts from P to D to R. I bet you will be able to localize the cause.

GL!


You can reach me at 888-790-7665

I haven't had a chance to do a visual. I was working in a shop, and I would use their lifts after work, except I didn't get a chance to check this sound as my car had other issues that needed to be addressed. Now I don't work there anymore. Gonna have to resort to the auto zone parking lot once more




Quote:
Originally Posted by generalvp View Post
Is this sound similar to what I have in this video?

http://vid276.photobucket.com/albums.../E46_click.mp4

it does sound similar but mine sounds a good amount louder




Quote:
Originally Posted by HLG600 View Post
Not necessarily. Fluid changes don't break transmissions in good health. Just about all of the cases where this was claimed the transmission was on its way out anyway. But, I understand your caution.

As for your symptom, sounds like a transmission mount to me. If they're original, I'd be surprised if they weren't shot by now.
Hhmm.. Don't know. My very experienced Co workers from the indy shop I worked at would all tell me that they saw high mileage cars get fluid changes that were shifting good when they pulled in, and which never had changes before, get stuck right in front of the shop with complete tranny failure.


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