240 240 Vibrations when accelerating / decelerating

jonc · 03-23-2022, 01:56 PM

Hi all,

I recently replaced my motor mounts and trans mount on my 91 244 with the automatic trans. Reason for the repair was the normal trans mount giveaways, vibrations when idling and on startup. I did the motor mounts a few weeks ago, moderate improvement but when I changed the trans mount this past weekend, a whole new collection of vibrations appeared.

It feels like they are running through the chassis, but appear on acceleration and deceleration, as well as when revving the engine in neutral above 1500-2000 RPM. Braking doesn't seem to affect them. My only thought so far is that the stiffer mount is now transmitting vibrations to the subframe that holds the transmission, but if that's the case then I have some serious issues I might need to look into...

Any help is appreciated

76RA24 · 03-23-2022, 02:28 PM

Driveshaft u-joints, center bearing also.

Pete

Otto Mattik · 03-24-2022, 07:30 AM

torque rod bushings ?

blkaplan · 03-24-2022, 05:50 PM

Quote:

Originally Posted by Otto Mattik

torque rod bushings ?

this, or axle bushings

jonc · 03-24-2022, 11:31 PM

I should add that the vibrations still happen in neutral. I think it may be the exhaust moving around, it was replaced at some point earlier in the vehicles life

Otto Mattik · 03-25-2022, 06:27 AM

Quote:

Originally Posted by jonc

I should add that the vibrations still happen in neutral. I think it may be the exhaust moving around, it was replaced at some point earlier in the vehicles life

Ok, looked at your first post again, .. you'll want to eliminate the obvious.
It might be something as simple as one of the rubber hangers slipped off, or maybe a cracked pipe.

Toybox · 03-27-2022, 09:38 PM

The first clues (vibration started immediately after replaced parts) strongly suggests driveshaft alignment issues. But then you said it vibrates in neutral also.

I'm wondering if you have multiple problems.

03-23-2022, 01:56 PM	#1
jonc Newbie Join Date: Feb 2019 Location: Seattle / Detroit	240 Vibrations when accelerating / decelerating Hi all, I recently replaced my motor mounts and trans mount on my 91 244 with the automatic trans. Reason for the repair was the normal trans mount giveaways, vibrations when idling and on startup. I did the motor mounts a few weeks ago, moderate improvement but when I changed the trans mount this past weekend, a whole new collection of vibrations appeared. It feels like they are running through the chassis, but appear on acceleration and deceleration, as well as when revving the engine in neutral above 1500-2000 RPM. Braking doesn't seem to affect them. My only thought so far is that the stiffer mount is now transmitting vibrations to the subframe that holds the transmission, but if that's the case then I have some serious issues I might need to look into... Any help is appreciated

03-24-2022, 07:30 AM	#3
Otto Mattik board member Join Date: Dec 2015 Location: Upper Midwest more or less	torque rod bushings ? __________________ Desperate need of elf assistant for interior work - Cash/Beer option $ Feedback thread: http://forums.turbobricks.com/showthread.php?t=323689

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03-23-2022, 02:28 PM	#2
76RA24 Board Member Join Date: Sep 2015 Location: BC	Driveshaft u-joints, center bearing also. Pete

03-24-2022, 11:31 PM	#5
jonc Newbie Join Date: Feb 2019 Location: Seattle / Detroit	I should add that the vibrations still happen in neutral. I think it may be the exhaust moving around, it was replaced at some point earlier in the vehicles life

03-27-2022, 09:38 PM	#7
Toybox mostly lurking Join Date: Dec 2018 Location: Nor Cal	The first clues (vibration started immediately after replaced parts) strongly suggests driveshaft alignment issues. But then you said it vibrates in neutral also. I'm wondering if you have multiple problems.