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Old 08-04-2021, 11:06 AM   #1
spock345
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Default Amazon M41 driveline vibration

I've noticed that I get some driveline vibration since installing my M41 whenever I let off the gas in overdrive. I've got a new carrier bearing and the transmission seems to be in good shape, if a bit weepy. In all other gears I don't get the vibration. Also no major vibration when on the gas in overdrive. It isn't unbearable but it is rather annoying.

I am thinking the driveshaft needs to be balanced. Has anyone else had experience with this issue?
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Old 08-04-2021, 12:14 PM   #2
hiperfauto
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Check the U-Joints for wear/looseness as well as rust. You can't really tell if any are binding unless you remove the drive shaft and manipulate them. Also, check the slip joint for wear.

Is the drive shaft phased properly? Even if it is it could be 180° off.

Inspect the tubes for damage or dents. That can affect balance.
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Old 08-04-2021, 01:05 PM   #3
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I checked the u-joints before installing the shaft. They were all good. Also gave them some fresh grease.

I am unsure if it is phased correctly. No dents in the tubes. I'll check the slip joint. I don't recall any significant wear.
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Old 08-04-2021, 01:33 PM   #4
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The yokes on the front half need to be aligned like the rear half. It can still be 180° off though. It depends on how it was assembled when originally balanced. That's why you're supposed to mark them before taking them apart.

http://hiperformanceautoservice.com/...rientation.jpg
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Old 08-04-2021, 04:22 PM   #5
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Quote:
Originally Posted by hiperfauto View Post
The yokes on the front half need to be aligned like the rear half. It can still be 180° off though. It depends on how it was assembled when originally balanced. That's why you're supposed to mark them before taking them apart.

http://hiperformanceautoservice.com/...rientation.jpg
Ah, I've got the yokes aligned. I am though using the original rear half with a different front half I got to fit the M41. Probably a good idea to go get the whole thing balanced at this point.
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Old 08-09-2021, 09:53 PM   #6
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I went under the car and found that there is a decent dent in the rear shaft. Not super noticeable until you are down under the car looking closely.
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