Hey guys,

So, my truck has had a vibration ever since my 518 gave out and I swapped in the Getrag, and I've been searching for it ever since.

A month or so ago I took a 1000 mile road trip and when I got back I found the big nut on the rear transfer case yoke was loose. It had also been leaking from back there (the front is slightly loose and leaking too...grrr).

So I tightened that nut as much as I could, which helped a lot, but I can't get it 100% tight. I still get side/side movement out of the whole yoke. I even threw a cheater pipe on the wrench for good measure.

Anyway, I did some research and found a post or two stating that the yoke itself could need replacing, and then I assume that the shaft could be loose meaning the transfer case itself could need a rebuild or something.

But, I don't really know too much about the ins and outs, so I wanted to ask someone who might have been through it:

What's my next step? Will a visual inspection of the threads tell me if the yoke is bad? Will shaking the output shaft itself, after I remove the yoke, tell me anything, or does the yoke tighten up the whole thing when it's installed?

Grrr....I just want a truck that doesn't vibrate when I drive it.

 

Incidentally, and I don't know if this is normal, but when I'm slowing for a light, if I pop it in neutral and just coast, I can hear gears whirring slower as I slow down. Not sure if that's normal or not, but I just started noticing that recently.

 

TTT?

Help?

:-)

 

Well now you got me wondering. I just went and checked mine for you and found that both of mine have some play also. Not much but some. I would think "some" movment would be ok but now I'm going to have to find a spec. I will research and let you know. I'll get a true reading with a dial indicator and hope to find a spec.
Thanks now I got something else to worry about.....J/K

 

The rear output has a roller bearing. The input shaft has a roller bearing. The rear output has a stub shaft that goes into a set of needle bearings in a pocket on the input shaft. When you add those two items together. There will be some movement in the assy.

The front output has a roller bearing by the yoke. The other side is a caged needle bearing. There will be minor movement here also. There are no provisions to set any end play.

The only clearence to set in a 205 is the counter shaft end play. No where else.

 

So...basically what the both of you are saying is that little bit of movement is normal, and my problem probably lies elsewhere?

 

Don't rule out the Tcase. It could cause vibrations in the drive train.

Now for a question. Are you using a 29 spline Tcase??

 

Yeah, I believe so. It's mated up to the back of the Getrag, so it must be, eh?

I had to ditch the transfer case that came on my truck...I wish I didn't have to...that baby was tight, and had Amsoil run it in its whole life. This one was used for plowing for a while, so I'm sure it's had a much rougher life.

 

Locked in 2WD high range. Your only using the in/rear output shafts. If the stub shaft has worn or bad needle bearings could cause a vibration.

I tore my 29 spline Tcase apart when I installed the G56. The only thing I used from the 29 spline Tcase was the case and trans adapter. Everything inside was worn badly. I am sure that Tcase would have been a vibration nightmare if I had installed it without checking it.

The 23 spline that was used for parts was perfect inside.

 

Grr!

I wish it was easier to track down a vibration.

So far I've:

Replaced uJoints
Replaced trans mounts
Replaced crossmember
Replaced injectors
Removed tranny to have flywheel and pressure plate rebalanced
Ordered motor mounts

It's almost got to the point where I've been thinking about my next vehicle on a semi-daily basis...and I haven't even had this truck a year!

 

Did you check to see if the engine adapter was centered properly to the crankshaft center line???

An auto flex plate can cover up a lot of sins. A stick shift will not allow.

 

No, that I did not. As a matter of fact, this is the first time I've ever even heard that off center engine adapter was possible.

 

Cummins is like any other MFG. It could happen. The worst one I have seen so far was a 400 SC. The adapter on it was .100" off center. You could stand there and watch the back end of the 10 spd do a slow rotation with engine RPM.

Over the years around diesel sites. I have seen a few members going threw flex plates pretty fast. That would be a good sign of that problem also.

 

Man,

I put the tranny in, then took it out again and then put it back in again...I don't fondly look forward to pulling it out again....especially now that it's getting colder out.

Now, is the procedure for aligning the engine adapter in the FSM?

Thanks for the advice, too!

 

What about the rear driveshaft? Maybe it is out of balance? I learned the hard way that you can turn the slip yoke any wich way you want. I had gotten mine 180* out and it vibrated bad.