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Old 04-15-2016, 10:34 PM   #1
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Removing driveshaft from DP

I have an odd vibration when I am traveling at highway speeds. When I accelerate and then decelerate it sounds like I am going over the rumble strips. I have greased my driveshaft and u joints, but the sound persists. I would like to take out my driveshaft and inspect. I have checked my ride height and the rear of my coach is 1/2" low and I will correct this after re-installing the driveshaft.

Does anyone have any advice or helpful hints?
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Old 04-15-2016, 10:53 PM   #2
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Because they're so stout, it's hard to grab and shake them to see if the u-joints are loose. How long have you had the coach? A previous owner may have removed the driveshaft to tow it. If the don't mark them, they can be installed 180 degrees off from where it should be. This will cause a vibration.

If yo decide to remove it, mark the position of the u-joints and pull it out. If it isn't the issue, you can put it back the same way.
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Old 04-15-2016, 10:55 PM   #3
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By " drive line " do you mean the drive shaft.

Typically the term drive line is used to describe every component that drives the coach , engine trans, drive shaft and differential as a group.

If you've greased the U joints , and haven't seen any rust come out of the seals with the old grease and your getting grease out of all 4 caps then.
JMHO: I'd get the low at the rear condition fixed and re-road test before looking at removing the shaft.
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Old 04-15-2016, 11:05 PM   #4
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Quote:
Originally Posted by Skip426 View Post
By " drive line " do you mean the drive shaft.

Typically the term drive line is used to describe every component that drives the coach , engine trans, drive shaft and differential as a group.

If you've greased the U joints , and haven't seen any rust come out of the seals with the old grease and your getting grease out of all 4 caps then.
JMHO: I'd get the low at the rear condition fixed and re-road test before looking at removing the shaft.
Yes, I mean driveshaft..

Anywhoo, back on topic, It looks fairly simple to drop out, the coach had 44,000 before I bought it and since I have this vibration I would feel better looking at it.
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Old 04-15-2016, 11:23 PM   #5
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A very strong warning to you before you attempt to remove it grasp the shaft in both hands and make absolutely certain you have some sideway play in it if it's tight do not remove until you block the wheels, let the park brake off and take it out of gear then check again for slack.

If you take the joint straps off and pry the driveshaft out of the yoke under pressure you may very well have your head handed to you with out ceremony.
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Old 04-15-2016, 11:38 PM   #6
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Noise on decel is u-joints. Follow all the safety precautions above and change them. Use Spicer. Make sure to clock your driveshaft/s correctly.
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Old 04-16-2016, 09:50 AM   #7
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Good advice here.


I replaced my front ujoint before the last trip because while under the unit I looked at the front of the driveshaft and saw this


I pulled the shaft and the front joint looked like this (no vibes. no sounds)
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Old 04-16-2016, 09:58 AM   #8
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I would fix the ride height first as most allow only a 1/4 inch out of spec's before you
start having trouble and I can tell you being out of spec's will cause all kinds of noise and failure of u-joints.
Make sure you measure the height at the proper place for your chassis.
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Old 04-16-2016, 10:01 AM   #9
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Gotta squirt grease in those ...Boys!
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Old 04-16-2016, 10:02 AM   #10
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Quote:
Originally Posted by DonDee View Post
Good advice here.


I replaced my front ujoint before the last trip because while under the unit I looked at the front of the driveshaft and saw this


I pulled the shaft and the front joint looked like this (no vibes. no sounds)
And no grease...
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Old 04-16-2016, 10:26 AM   #11
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Tasks

First is get the ride height correct as it directly impacts the drive shaft.

Too much angle and it is not going to like it.

Next you cannot shake it but yiu can look at it with a helper.

Drive it up on blocks or a he'll or dip in driveway so you can slide under to see the drive line and u joints.

Get a cell phone with hands free for you and another for your helper.

Show helper how to insure park brake on and STAND ON BRAKE PEDAL while placing unit into drive then reverse then back into drive.

First at idle then adding some throttle just as it shifts.

Practice first.

Be sure the mh does not move then have helper practice and after you are certian then go watch and direct helper.

Look for any movement in the parts of the shaft.

Sloppy u joints will allow the parts to shift as the stresses reverse.
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Old 04-16-2016, 11:38 AM   #12
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The "Ride" height should have not changed without messing with the leveling valves, your vibration is either the u joints not being serviced or you drive Tires cupping, I'm going with #1...
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Old 04-17-2016, 03:34 PM   #13
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Thanks for all the tips. I got the driveshaft out today, it was fairly simple.

All the u-joints move freely and I don't feel any grinding. Is there anything else that I should look for before re-installing?

The splined part has a collar that was just hand tight. How tight should it be?

thanks
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Old 04-17-2016, 04:47 PM   #14
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Look for correct shaft phasing.
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