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73 W100 Drivetrain vibration #2788228
06/22/20 08:09 PM
06/22/20 08:09 PM
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Cleveland, Ohio
northcoastmopar Offline OP
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I’ve been making slow progress on my 73 W100 and got to the point of driving it down the road. I got up to around 20 mph and I get a severe drivetrain vibration. It literally shakes the transfer case lever like crazy. Reading some I see that it might be the driveshafts may not be in parallel.

Looking under the truck the main rear driveshaft is definitely not parallel when looking at the alignment of the yokes. I’m thinking this could be a cause of my issue? Not sure how it could be off-center unless someone pulled the drive shaft and didn’t index the spline when they put it back together?

At any rate if this is something that needs to be corrected I’m guessing I should just replace the u-joints? Any seals I should sway while I’m doing this?

I did check the mounting points and mounting bushings for the transfer case and all looks good there. The front drive shaft yokes all look to be parallel.

One of the pics is upside down but it still shows the difference in yoke orientation.

Thanks in advance.

F00EF1AC-884C-467B-A210-1BD306DA1EF9.jpegF4EA2745-0E78-43A2-9766-5E3026C1DFBB.jpeg
Last edited by northcoastmopar; 06/22/20 08:19 PM.
Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788241
06/22/20 08:31 PM
06/22/20 08:31 PM
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Here is my advice and I have fixed many of these. First double check all the joints. Recommend dropping the shafts and checking all the caps. If a joint is seized it can cause a problem. Once the joints are checked and ok you need to be sure the shafts are phased. If that is ok you will have to most likely twist the transfer case crossmember to correct the short jack shaft angle between the transmission and transfer case. If you can get good pictures I can try to direct you on what to do. Like I said I have done many.

Re: 73 W100 Drivetrain vibration [Re: NITROUSN] #2788248
06/22/20 08:42 PM
06/22/20 08:42 PM
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Cleveland, Ohio
northcoastmopar Offline OP
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Cool thanks...yes, phased is probably the better word than parallel. Take pics of each of the u-joints and try to do so at the same orientation?

Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788302
06/22/20 11:43 PM
06/22/20 11:43 PM
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By the pictures it looks like it might be one spline off, but that could just be the angle of the picture. I would drop the shaft out and check each U joint to be sure everything moved smoothly, then be sure the shaft has the joints in phase. It doesn't take much roughness to give a vibration.
I might also be concerned with how much engagement there is on the splines, it looks like there isn't much shaft inside that yoke. Gene

Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788349
06/23/20 07:59 AM
06/23/20 07:59 AM
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Originally Posted by northcoastmopar
Cool thanks...yes, phased is probably the better word than parallel. Take pics of each of the u-joints and try to do so at the same orientation?


If possible try to get a complete picture including the yokes of each shaft. The intermediate or jack shaft is the one I would like to see

Re: 73 W100 Drivetrain vibration [Re: NITROUSN] #2788368
06/23/20 09:25 AM
06/23/20 09:25 AM
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Cleveland, Ohio
northcoastmopar Offline OP
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Originally Posted by NITROUSN
Originally Posted by northcoastmopar
Cool thanks...yes, phased is probably the better word than parallel. Take pics of each of the u-joints and try to do so at the same orientation?


If possible try to get a complete picture including the yokes of each shaft. The intermediate or jack shaft is the one I would like to see


Got it. Will grab pics tonight. Thanks!

Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788405
06/23/20 10:38 AM
06/23/20 10:38 AM
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chicagoland,usa
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If the splined yoke has never been slipped off of drive shaft, it all should be fine. I learned that long ago because some shafts do not have that double key that only lets the two go back together one way. If you index it any way you want, there will be huge bad vibes.

Re: 73 W100 Drivetrain vibration [Re: buildanother] #2788415
06/23/20 11:11 AM
06/23/20 11:11 AM
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Cleveland, Ohio
northcoastmopar Offline OP
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Originally Posted by buildanother
If the splined yoke has never been slipped off of drive shaft, it all should be fine. I learned that long ago because some shafts do not have that double key that only lets the two go back together one way. If you index it any way you want, there will be huge bad vibes.


I have no idea regarding the history of this truck. The seller fibbed and omitted a lot of things so I don't know what's original or been monkeyed with.

Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788434
06/23/20 12:06 PM
06/23/20 12:06 PM
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Byron, NY
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Id start with correcting the phase angle (new U joints as long as your there)


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Re: 73 W100 Drivetrain vibration [Re: W.I.N. racing] #2788637
06/23/20 08:56 PM
06/23/20 08:56 PM
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Cleveland, Ohio
northcoastmopar Offline OP
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NITROUSN.....here are some pics. Let me know if I need to get any other.

3C56DBA2-C40F-4691-A5AB-A3BFBD29B695.jpeg
Last edited by northcoastmopar; 06/23/20 08:57 PM.
Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788640
06/23/20 09:05 PM
06/23/20 09:05 PM
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Cleveland, Ohio
northcoastmopar Offline OP
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More

873F944B-9094-40CE-A391-D5298B9B4CCB.jpegBA5E915C-77D5-4600-B1AD-25157D11B25F.jpeg59644516-D0FF-4850-8CBB-896220D0E124.jpeg
Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788642
06/23/20 09:07 PM
06/23/20 09:07 PM
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Cleveland, Ohio
northcoastmopar Offline OP
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Some more

75C7BFCA-8BBD-4F52-9657-905BA5423BC7.jpeg3EC10223-DA2F-4D67-8B67-C15CCE911FE5.jpeg1A127BAC-B4F8-4FCB-8C31-B319EE0FB5AE.jpeg19190A1F-E517-4048-9AEB-6EDF4786E8BB.jpeg
Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788644
06/23/20 09:09 PM
06/23/20 09:09 PM
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Cleveland, Ohio
northcoastmopar Offline OP
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That’s it

7937AA9C-D1C4-4678-BCA7-D2B2A584AE02.jpeg15D060F7-AC69-454B-9C70-DF62D4C94E70.jpeg64174320-73DD-44EE-9AE8-F7EEC71AD332.jpegF34DCC4A-665A-424C-AEA6-176BF960B961.jpeg
Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788658
06/23/20 09:53 PM
06/23/20 09:53 PM
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Yikes. I see three problems. Front shaft out of phase, rear shaft out of phase, wrong transmission. The first thing I would do is remove the front shaft and leave it off for now. Remove the rear shaft check the joints, replace if needed and re-phase it. Re-install it and drive it. I doubt it will change but its worth trying. The transmission is a 2wd long shaft with a slip yoke. It should have a short tail shaft with a bolt on yoke. The shaft should be with 2 joints and a slip yoke. So doing as I suggested check if it vibrates, If ok by some chance you can check the front shaft joints and re-phase it install and see how that works. Now if it vibrates with just the rear shaft I would try this. Unbolt the transmission shaft from the TC and see if it will slide into the transmission at least 1/2 to 1 inch. If it does not slide the transmission may be loaded against the TC which will vibrate. The motor and transmission would have to be moved forward. Band aide fix and not my choice. What is there is not right and kind of a hack job. If it were mine I would be doing the transmission back to the short style and get the right drive shaft, Right now I will just about bet the problem is between the TC and transmission.

Re: 73 W100 Drivetrain vibration [Re: NITROUSN] #2788661
06/23/20 10:09 PM
06/23/20 10:09 PM
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One other item I would like to see is the transmission cross member and mount areas. Also you could remove both F&R shafts put the TC in neutral and run it in gear and see what it does. Look at that short shaft and see how true it is. The TC and transmission center lines would have to be so true for this to even try to not vibrate. I just see a problem there that most likely will not go away. Just to wrong.

Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788718
06/24/20 06:37 AM
06/24/20 06:37 AM
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driveshaft out of phase will definately cause the vibration you describe, bought a ramcharger with same problem, i pulled the splines apart and reindexed them and it drove like new.

Re: 73 W100 Drivetrain vibration [Re: NITROUSN] #2788738
06/24/20 08:54 AM
06/24/20 08:54 AM
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Cleveland, Ohio
northcoastmopar Offline OP
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NITROUSN -

Thanks...ugh...another clear example of why not to buy a vehicle from across the country without inspecting in person. A drunken eBay purchase....

I'm assuming this is the type of jackshaft I need if I had the correct short tail trans? I can check FSM when I get home but do you know model number of correct tail trans I need? I assume these are a little hard to find and I have to decide whether I want to sink the cash or just part ways. It's a shame, because it's a cool truck. 99% rust free, 400bb, a/c, cruise, two tanks, camper package...etc.

I will probably mess with it removing the front driveshaft and getting pics of the trans mount tonight...grrrrr.......

s-l1600.jpegIMG_0145.jpeg
Re: 73 W100 Drivetrain vibration [Re: northcoastmopar] #2788762
06/24/20 10:46 AM
06/24/20 10:46 AM
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The biggest problem is probably this. Between the missing 2nd u-joint and being squished against the transmission it's not getting the proper movement it needs.
It might not be a bad idea to clean up the splines on the end of the driveshaft either to make sure nothing binds.

The proper short tail shaft transmission shouldn't be too hard to find. Even with big block quite a few pop up on car-part.com and are in the 300-500 range. You might have to get it shipped but a buddy of mine even had to do that to get a small block 904 recently because there was none local!!??

5474212-727TruckShortTailshaft.jpg75C7BFCA-8BBD-4F52-9657-905BA5423BC71.jpeg
Re: 73 W100 Drivetrain vibration [Re: 5thAve] #2788880
06/24/20 04:06 PM
06/24/20 04:06 PM
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Same area code as 5thAve...just passed on a BB shorty 727 with a weird motorhome tail shaft. I have an extra 2 already, but as he mentioned should be able to find one close to home.

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Re: 73 W100 Drivetrain vibration [Re: 64Bel] #2788934
06/24/20 06:30 PM
06/24/20 06:30 PM
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Thanks everyone!

NITROUSN,

Requested pics of trans mount.

E027ED3C-6714-46F0-AD3B-F9CDC462FC5B.jpeg9F99F21D-EA14-4E69-8DB6-225AC5F5035E.jpegB501F10B-0A74-4653-8550-3DF11FB97C54.jpeg79B23449-9038-4F4C-B30D-6251671DEDD6.jpeg
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