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Automatic Transmission downshifting clunk.

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Old 11-11-2007, 04:13 PM   #1
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Question Automatic Transmission downshifting clunk.

I am just wandering if anyone else has the same issue, here is what I have:
When I am stopping my truck in a steadily firm rate (not an emergency stop, but not an easy one either) I can hear a feel a ?clunk? that coming from the transmission area.
I think I am hearing downshifting from second to first gear. This only happens when transmission is cold, after it warms up this problem completely goes away.
Also if I am easy on the brake and slow down gradually there is no clunk, even when transmission is cold.
Other than that transmission perform flawlessly, including times when I am towing a boat trailer.

Info about my truck: 1996 4Runner 4x4, 3.4L, Auto. Truck has 102 K on it.
Transmission filter was cleaned when it had about 65K, transmission oil was changed by draining and adding around 4.5 Q every 25K.

Any thoughts and recommendations are appreciated.
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Old 11-11-2007, 04:38 PM   #2
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Probably the driveshaft splines in your tranny sticking and then breaking loose when the weight of the vehicle come down in the rear. Pretty common problem. I have a 98 4runner and mine does it. If it bothers you then take out the driveshaft and clean and lube the yoke splines.
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Old 11-11-2007, 05:10 PM   #3
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That is the driveshaft telling you it is time to lube. Get under there and lube all 5000 zerk fittings.
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Old 11-11-2007, 05:45 PM   #4
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Lube your driveshaft and it should go away.

Best links:
http://www.4runners.org/writeups/zerk/index.html

http://www.4x4wire.com/toyota/mainte...tenancep4.html
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Old 11-11-2007, 06:41 PM   #5
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Thank you for all your responses!
So you think it is a driveshaft not a transmission??

My fear was that is a transmission?I hope I was wrong.

I am hearing this clunk while truck still in motion going about 5-10 mph, what I am trying to say is that this is not a typical (for 4 Runners that needs yoke lubrication) thud that you can hear in the rear when you come to complete stop and then release your break?

Any way? I do lubricate driveshaft regularly but I will do it again, I hoping that clunk will go away.
I will keep my fingers crossed and post the results.

Thanks again!
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2004, 4runner, auto, automatic, braking, clunk, clunking, clunks, downshift, downshifting, grade, shifting, slowing, toyota, transmission

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