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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 01-21-2009, 04:56 PM   #1
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A Bad Automatic Transmission Mount may be causing My Vibration?

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Old 01-21-2009, 05:35 PM   #2
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There is a linkage underneath my 4runner that lost the "boot" around it. Whenever I come to a stop, and even more so when I shift into reverse, I get a horrendous vibrating sound and obvious shaking in my cab. Not sure of what this linkage is called but it seems to be related to the auto tranny. That might be what your experiencing. Looks like a PIIT to fix, but I'll have to look closer when it gets warmer.
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Old 01-25-2009, 05:49 PM   #3
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Old 01-26-2009, 04:24 AM   #4
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You sure its coming from the tranny and not a drive shaft?
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Old 01-26-2009, 07:56 AM   #5
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Old 01-26-2009, 08:26 AM   #6
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There isn't really a flywheel on an auto, the TC is bolted straight to a drive plate (flex plate), which is bolted to the engine output (crank shaft flange I guess its called)





I guess you might want to remove the inspection plate (see pic below) and look to see if all the bolts to the TC are tight. You have to rotate the crank around to check them as you can only see them one at a time. I would probably rotate the engine by the crank shaft bolt, but only turn it in a righty tighty direction so you don't loosen the bolt by accident. IIRC there are 6 bolts, one has a slightly different color and shoulder size. It is suppost to be inserted first to help center the TC to the engine.

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Old 01-26-2009, 08:33 AM   #7
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Quote:
Originally Posted by buckz6319 View Post

When in park is the engine flywheel turning?...but not the t.c.?.....and in park the drive shaft doesn't turn correct?
The drive plate will always be turning when the engine is running as will the TC since its bolted to the drive plate. Correct, the drive shaft doesn't turn in park or else you'd be moving in park. Don't want that, hehe.
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Old 01-26-2009, 02:16 PM   #8
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You might check your engine mounts (if you havent already) I broke one of mine and got some of the same issues that you are describing.
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Old 01-26-2009, 02:27 PM   #9
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Old 01-26-2009, 02:38 PM   #10
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Old 01-26-2009, 03:24 PM   #11
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...and btw is there a bearing in the t.c. that could be going out because what is happening sounds like what a bearing would sound like when it's going bad...
Yes, http://en.wikipedia.org/wiki/Torque_converter
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Old 01-26-2009, 03:34 PM   #12
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I was looking at it just a few minutes ago and saw some large brackets on the left side and right side of the engine block that look like I will have to remove them to get the inspection plate to come down?...
Shouldn't have to remove those, but I probably did because my tranny was coming out away.
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Old 01-26-2009, 07:11 PM   #13
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Would it be safe to say that the engine is just running rough under load? I mean, you said when you're coasting with the engine turned off there is no vibration, right? And, you still feel the vibration with the vehicle stationary and yet revving the motor. Does the vibration occur at all when idling or just under load/acceleration?

Would it be possible for you to get a very inexpensive stethoscope, have your wife or someone rev the motor in park, and listen around for the source of the vibration? Like at the output bearings, motor mounts, harmonic balancer <<<CAREFULLY!!, etc. That's what I would do.
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Old 01-27-2009, 02:44 AM   #14
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Old 01-27-2009, 04:33 PM   #15
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Weird Automatic Stick Issue

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Old 01-29-2009, 03:01 PM   #16
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Old 01-29-2009, 03:09 PM   #17
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I usually just put in on and start touching the tip on things to hear the noises they make. When you touch the source of a noise its pretty obvious, almost painfully loud sometimes. Just make sure you don't hit the fan or something
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Old 01-30-2009, 03:44 PM   #18
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Old 01-30-2009, 05:21 PM   #19
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I guess the flex plate being loose or broken or the t.c. bolts being loose would be worse with rpms being higher. So in that repect the rpms would normally be higher with OD off. But I can't see how that would cause the shifter to move a lot. I don't remember ever seeing movement in my auto shifters. It is only connected to the tranny by a linkage rod I don't know let me think about that one.
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Old 01-30-2009, 05:34 PM   #20
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Old 01-30-2009, 05:34 PM
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