Vibration Only on Take Off
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
I changed the rear dif. oil 6 months ago with Mobile 1 syn. However the problem was there before this and the syn oil did not fix the problem. The motor runs great so I'm sure it has to be coming from the drive shaft/or u-joints. Thanks for the input I'm going to do a re-grease on the drive shaft. It just amazing how little things like air pressure and grease can do wonders on how your truck drives. 
Laughing Gas
Joined: Apr 2007
Posts: 1,028
Likes: 3
From: Broad Run, Va
Ok... I went to grease the slipyolk and there was no zerk. In fact there are no zerks at all anywhere on my driveshaft. There is a rubber collar by the carrier bearing but no way to grease it.
What up w/that???
What up w/that???
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
Yep, you got it! I guess it'a an attempt to make the driveline maintenance free.
To grease the slip yolk you need to drop the driveshaft. Step #1, MAKE SURE THE WHEELS ARE CHALKED! Don't want to see anybody get run over!
Remove the straps that hold the rubber boot in place on the driveshaft. Mark the slip yolk and the driveshaft. They need to go back together the same way they came apart. You can't be off one spline or it could mess up the balance of the driveline. Drop the driveshaft by removing the straps on the u-joint at the rear axle. Clean the old grease off and put some new grease back on the splines. You will want to put some grease on both the splines and the slip yolk. Re-install the driveshaft. You can use some tie-straps to hold the rubber boot in place. This is important to keep contaminants from getting in there.
To grease the slip yolk you need to drop the driveshaft. Step #1, MAKE SURE THE WHEELS ARE CHALKED! Don't want to see anybody get run over!
Remove the straps that hold the rubber boot in place on the driveshaft. Mark the slip yolk and the driveshaft. They need to go back together the same way they came apart. You can't be off one spline or it could mess up the balance of the driveline. Drop the driveshaft by removing the straps on the u-joint at the rear axle. Clean the old grease off and put some new grease back on the splines. You will want to put some grease on both the splines and the slip yolk. Re-install the driveshaft. You can use some tie-straps to hold the rubber boot in place. This is important to keep contaminants from getting in there.
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