Re: [MBZ] 1980 300SD Drive train vibration

Yes, I was also forgetting that one. Any rubber mounts / bushings / flex discs that are older than ten years are suspect according to the late Dr Marshall Booth. Rubber mount for differential? Maybe start with engine mounts and then replace every piece of rubber back to the differential

Re: [MBZ] 1980 300SD Drive train vibration

My indy was of the mind that it was a waste of his time and my cash to fix just one flex disk when I came in with vibrations. His book time to do the front and rears along with the center bearing was close enough to just doing a single disk. Just the cost of parts with the mark up. I never

Re: [MBZ] 1980 300SD Drive train vibration

Being off one spline WILL cause vibration. Randy Bennell via Mercedes December 11, 2019 at 5:09 PM I have not done it but it should be fairly easy to replace the center support. The big thing is to be absolutely sure that you mark the parts so that they can be

Re: [MBZ] 1980 300SD Drive train vibration

+1 Jaime Kopchinski via Mercedes December 11, 2019 at 1:38 PM I'd put my money on center support bearing and carrier. Jaime ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To

Re: [MBZ] 1980 300SD Drive train vibration

Oh, I forgot -- a bad transmission mount is a very likely cause of vibration under acceleration and not under coasting -- the torque pushes the transmission up off the mount, and drag pushes it down. Easy job. Peter ___ http://www.okiebenz.com To search

Re: [MBZ] 1980 300SD Drive train vibration

Center bearing support bushing is bad. I'd replace the front flex disk if the rear was bad too, they are under the same conditions and if one was iffy the other is too. Worth the time to replace the center carrier bearing too. What happens is that under acceleration the bad bushing will allow

Re: [MBZ] 1980 300SD Drive train vibration

On 11/12/2019 4:45 PM, ROGER HALE via Mercedes wrote: Thanks to all for their input and suggestions. More detail: the rear axles and boots look ok, no slack there, the tranny was a used unit purchased in Arizona and installed 2 years ago (probably less than 1,000 miles since installed) and

Re: [MBZ] 1980 300SD Drive train vibration

Agreed. Especially since the vibration goes away on deceleration (no load). -D > On Dec 11, 2019, at 2:39 PM, Jaime Kopchinski via Mercedes > wrote: > > I'd put my money on center support bearing and carrier. > > Jaime > > >> On Wed, Dec 11, 2019 at 2:27 PM ROGER HALE via Mercedes < >>

[MBZ] 1980 300SD Drive train vibration

Thanks to all for their input and suggestions. More detail: the rear axles and boots look ok, no slack there, the tranny was a used unit purchased in Arizona and installed 2 years ago (probably less than 1,000 miles since installed) and it's ok except the vac from the IP to the modulator

Re: [MBZ] 1980 300SD Drive train vibration

Yes, this is true... its likely the center support, not the bearing itself. Its a good idea to replace the flex disc as well. Both can look fine visually and cause issues with vibration. Jaime On Wed, Dec 11, 2019 at 2:40 PM Jim Cathey via Mercedes < mercedes@okiebenz.com> wrote: > Once

Re: [MBZ] 1980 300SD Drive train vibration

On 11/12/2019 1:26 PM, ROGER HALE via Mercedes wrote: Time to consult the brain trust. I've been getting my 1980 300SD revitalized and back into driving condition. Almost everything is done, except, it still has a vibration somewhere in the drive train when accelerating. It starts at

Re: [MBZ] 1980 300SD Drive train vibration

That's a good start point, and usually the solution. Start with simple / cheap known wear items. Are the boots on the half axles still intact? If they've failed, time to replace those. The U-joints can get stiff / notchy with time, and I understand a good mechanic can feel the movement when

Re: [MBZ] 1980 300SD Drive train vibration

Once you've experienced it, driveline vibration is much higher pitched than wheel-related noise. (Due to the gear ratio in the differential.) Seems to me that it would be unlikely to be the center bearing, but it could be the front flex disc or the center support bushing. Or, the U-joint. Of

Re: [MBZ] 1980 300SD Drive train vibration

I'd put my money on center support bearing and carrier. Jaime On Wed, Dec 11, 2019 at 2:27 PM ROGER HALE via Mercedes < mercedes@okiebenz.com> wrote: > Time to consult the brain trust. I've been getting my 1980 300SD > revitalized and back into driving condition. Almost everything is done, >

[MBZ] 1980 300SD Drive train vibration

Time to consult the brain trust. I've been getting my 1980 300SD revitalized and back into driving condition. Almost everything is done, except, it still has a vibration somewhere in the drive train when accelerating. It starts at around 40mph. My Indie replaced the rear flex disk which