Driveshaft problems
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Elder User
Joined: Oct 2005
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I think you are talking about the piece on the driveshaft assembly in front of the forward U joint that goes into the trans.... I guess I should replace that and the forward U joint... and see if that gets it.
Posting Guru
Joined: Oct 2007
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boba if you can grab that spline that goes into the trans and you have play up/down/side/side chances are the slip yoke is wore out and could give you a vibrration also do you have a steady bearing [2 pc driveshaft?] i would remove the whole shaft put it on a bench and check all the joints for loose/dry/roughness and when you reinstall it turn if 180 degrees if you can i know a drive line problem can be very agitating from expeiriance and you may have to take it to a drive line shop to get them to ballacne it or check the angles
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I wanted to follow up and let you know where I am with the problem..... after checking angles and doing some head scratching I found in the 73-79 info section at the top of the posting that the bold the holds the trans mount to the cross member should only be tightened to 10-15 ft lbs.... so I loosened it up and held the nut on with some thread locker.... and strangely enough the wobble kinda disappeared for the most part.... the shift rods are no longer vibrating like crazy at 0-90 mph.....
You can still feel a little wobble there though sometimes.... and once you get over 100 it start banging away again....
I would bet it probably would do better with a AL driveshaft because the length of the thing.... and since 80 is really the max road speed limit I am kinda going to live with it for now.....
You can still feel a little wobble there though sometimes.... and once you get over 100 it start banging away again....
I would bet it probably would do better with a AL driveshaft because the length of the thing.... and since 80 is really the max road speed limit I am kinda going to live with it for now.....
Post Fiend
Joined: Dec 2007
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From: Lost
There is a bushing inside the tailshaft housing that the slip yoke fits into. If the bushing is a bit worn, it will let the slip yoke wobble a bit. At speed, that little wobble can really turn into a bad vibration.
Of course, if you make a habit of driving your truck at speeds reaching 100 MPH, perhaps you should leave the vibration alone, and start worring more about keeping your driving priveldges intact.......
Of course, if you make a habit of driving your truck at speeds reaching 100 MPH, perhaps you should leave the vibration alone, and start worring more about keeping your driving priveldges intact.......
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Elder User
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I got you Wullf..... Originally it would vibrate badly at like 55 then smooth out then start hammering again at 70..... Then smooth out..... Weird..... And the slip yoke us tight so i couldn't figure it out..... Why the wobble.... Checked the angles.... Was lost..... Now it works well up to beyond the speed limit..... It's not totally gone if you know what to look for..... But it about gone..... I think the factory shaft is too long IMHO..... But it is fine for street use!
Hotshot
Joined: Feb 2004
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From: The Shenandoah Valley
Speaking of that rear bushing mentioned by RW .... drive shaft imbalance will wear that rear bushing in the trans tail shaft housing. That truck has a long shaft and it was built when 55 was the national limit. Likely has 3.55 gears as well. A long drive shaft at high speed with one end spinning a wobbly circle is a lot like a jump rope. Balancing a drive shaft and yokes on a machine will not cure a worn bushing nor cover it up.
Not all that hard to grab the yoke and shake it and if it wobbles, replace the tailshaft bushing. That bushing, if worn, is also working on the rear seal and I've seen more than one blow trans fluid out in a half mile and a messy tailgate or back glass.
Not all that hard to grab the yoke and shake it and if it wobbles, replace the tailshaft bushing. That bushing, if worn, is also working on the rear seal and I've seen more than one blow trans fluid out in a half mile and a messy tailgate or back glass.
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