From Jason's Garage - Testing the Driveshaft

In this video from "Jason's Garage", I show how to check condition of a driveshaft. Particular attention is given to the rear section CV joints, which often ...

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Comment by Norman Silverman on December 4, 2018 at 3:06pm

Vibration on my 64 is felt more strongly when I actually accelerate than when I am just running along (although it is present then, too). If I shift in to neutral, it pretty much goes away. Does this sound more like CENTER BEARING/CARRIER or weak CV joints. I'd like to be prepared before I take things apart because I will be using a lift provided for 4 hours on a Saturday morning by my regular (diesel) mechanic. All opinions welcome-especially good ones. 


Comment by Norman Silverman on June 28, 2018 at 9:05pm

Fantastic and highly informative!!!!

Comment by Tony and Ginny 429 on June 17, 2018 at 2:19pm

How many grease zerks are there from the front -  to the rear —of the driveshaft 

Kim indicated that he greased the rear CV joint so we have one in that location 

I have a shop do my body grease with the grease powered into the zerks that will push old dirty grease out of some locations ( ball joints )

think this method is superior to a hand grease gun as it flush out old grease a bit more 

That is why I have no idea how many  zerks are on the driveshaft 


Comment by Tony and Ginny 429 on July 8, 2017 at 2:00pm
Thank you for the info on the U joints and there interaction
Your detail knowledge of our year cars benefits all who can read this website

After this thread Now we can direct the diveshaft shop to be sure thet they address the U joints and have a video to show them how the U joints interact
That is truely priceless ( a picture is worth ----)

These u joints are very large and chunky
For any reason is it difficult to aquire the correct stock U joints for replacement in 2017 to fix them with new fresh parts
Prior to this i always thought a spring action in the back part of the driveshaft would be responsible for the vibration issues ( or is this the sping action refered to at times )
I just pictured the spring action to be something else or is there something else that springs also ?

I would think with all the trucks running around that the size should be available from another application

Comment by Jason Edge on July 8, 2017 at 1:53pm

Main thing is to have the driveshaft locked down in a vice, and angle it so you get max wrench jaw on the square of the nut.

Comment by Anders on July 8, 2017 at 1:50pm

Thanks Jason. I was trying a large adjustable wrench, but felt it might damage the nut.

Comment by Anders on July 8, 2017 at 1:48pm

What brand and model number are recommended for:

Universal joints 7806140 (5 pcs)

Center bearing 904778 (1 pcs)

Center bearing support and bracket assembly 5676991 (1 pcs). Rockford 463-56?

Constant velocity universal joint repair kits (2 pcs). Rockford 403-01 has been recommended. Any other?

Appreciate any and all input in this matter. There might be inferior products that we should stay clear off. Like the wheel bearings (only buy SKF).

Comment by Jason Edge on July 8, 2017 at 1:37pm

I use a very large adjustable wrench to remove the center member bearing bracket nut. I hold it in place on a bench vice with the nut pointed up, and wedge the jaws of the adjustable wrench in just right to make sure it has a good grip on the nut. The nut backs off counterclockwise.

Comment by Anders on July 8, 2017 at 12:22pm

Had some noice/vibration issues so after checking Jasons video I decided to remove the drive shaft and check the universal, cv joints and the center bearing. The center bearing is in poor condition and has to be replaced, still working on a way to remove that nut. Most likely will have to fabricate something similar as the recommend tool J-21009 Center Bearing Retaining Nut Remover and Installer. Will the nut be loosened by turning counter clockwise?

I then tested the universal joints according to Jasons instructions in the video. There is no play on them and moves freely. Had a car mechanical friend look as well and he didn't think anything was wrong. However when testing the spring action on the CV joints the joints does not have any "resistance" just moves freely. I can see the CV ball and its rusty. My guess is that I need to get Rockfords CV repair kits. Can't say I'm looking forward to that after reading the comments by others.

I read all comments and understand the principle of doing this job, but if someone has anything to add it would be great.

Comment by Clovis on October 16, 2016 at 3:02pm
I hve replaced both the tail stock bushing and the rear motor mount (transmission mount) I will be doing some front and rear suspension work soon so I will look at the drive shafts carefully.

I do find that the vibration is almost inperceptible at times, and at others quite noticeable. This could be a result of worn ball joints that go in and out of alignment. I may do some more evaluating based on this new insight of the cv joints. As I think this through the current most logical explanation would be going from forward to reverse, back to forward realigning the cv joints or the ball and stud itself.

As I use this car, almost, as a daily driver when in town I am pretty intimate with its idiosyncrasies. (Yes I love my car so I'm intimate with it LOL)

The other day, on the highway, doing 70 mph I could perceive zero vibration, on the return trip I felt it through most of the rpm's. As I back my car into the garage this has led me on this path of forward and reverse realigning the joints. Stay tuned more to come.


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