Noisy rebuilt Getrag

[RTRAM]

I had my Getrag rebuilt locally about six months ago. Since then, it is fairly noisy. When at the drive-though it is actually louder that the Cummins. When I put the clutch in, everything is quiet. I put a new South Bend clutch in.



The current trans oil is what the builder put in, Coastal 80-90. I was waiting for the parts to wear in a little and will be looking to move to a synthetic 10W-30



Any suggestions on what to look for?

 

[MMeier]

Let me guess... . Drive Line Service?

 

[1stgen4evr]

Any suggestions on what to look for?- - - -



A different shop for sure. And if you are really unlucky, another transmission. A proper built Getrag doesn't make noise.



I strongly advise to stop driving the truck, you can do (and may already have done) catastrophic damage.



What about before the clutch install? Could be that is where the problem is. Could also be the throw out bearing and not the clutch or transmission. Is/was the pilot bearing in good condition?



Best of luck.



James

 

[tkerrigan]

Yes, quit driving it. The 80-90 wt oil by itself will ruin the bearings. You should have it checked at a qualified transmission shop and hopefully you can use small claims court for excess damages over the cost of a rebuild. You might try backcharging if you used a credit card, but looks like too much time might have gone by. Save a sample of the oil for court.

 

[1stgen4evr]

The 80-90 wt oil by itself will ruin the bearings.





In spite of strong argument otherwise, I have run 85aw since about 125k miles, with over 500k accumulated as of now and still going. Not against any other method, just reporting my experience. Certainly would advise to do what your experience and preference is.



James

 

[dpuckett]

If it gets quiet when you push in the clutch pedal (disengage the clutch), I'd be tempted to think of the throwout bearing or pilot bearing (if you have one).



Daniel

 

[Moab4x4]

If it gets quiet when you push in the clutch pedal (disengage the clutch), I'd be tempted to think of the throwout bearing or pilot bearing (if you have one).

?

?

I would think the reverse on this as when you push in the pedal, the flywheel and the input shaft begin to rotate at different speeds (working the pilot bearing) and you are using the throwout bearing (the inner race with the input shaft and the outer race with the flywheel)

When the clutch is at rest, engaging the flywheel, there should be no movement in those bearings.



Or, I am I still punchy from my trip and not reading this right.

Ken

 

[dpuckett]

When you disengage the clutch, you engage the throwout bearing, as it loads that bearing, like *WE* both said. It also places a load on the pilot bearing, as the engine (flywheel) and input shaft are now turning different speeds.



I was meaning in that area, as oppposed to in the transmission itself. You may still be a little punchy from your trip:-laf



DP

 

[RTRAM]

What type of catastrophic damage are we talking about? Is it to late to just move to 10-30. What is the verdict on synthetic versus old fashion oil?



I will take an oil sample for analysis. What am I looking for?



The clutch is a South Bend and it had a new throw out bearing with it. I added a pilot bearing from Quad 4x4.

 

[RTRAM]

Also, the shifter is noiser than before. I thought I read that there is a repair kit for that. I had the rebuild at Stick Shift City, it was recommended by a mechanic friend.

 

[Moab4x4]

Yup, still punchy.

The noisy shifter kit I have seen referred to was for the xfer case shifter and it tightened up the spring and bushing to keep the shifter from banging around. Mine was wrapped with foam pipe insulation and duct tape and it worked pretty well. It sounds like that is not your problem though. Maybe I will have a better idea as soon as I yank mine out and see what is noisy inside mine.

My oil analysis was a coffee filter to see the little metal chunks in the oil. I am pretty sure they still should have been connected to some bigger metal chunks somewhere else.

I too had my flywheel bored and I installed the Quad4x4 pilot bearing. I am starting to wonder if the machinist got the hole centered. What would that sound like? Would that stress the bearings and cause them to wear out sooner???

Ken

 

[1stgen4evr]

- - - -I too had my flywheel bored and I installed the Quad4x4 pilot bearing. I am starting to wonder if the machinist got the hole centered. What would that sound like? Would that stress the bearings and cause them to wear out sooner???- - - - -





Being a machinist, I would say that it would stress the bearings to a small degree. Certainly it should be dead center. Just a guess but I think it would show up as a vibration due to the fact that the dead center position of the pilot bearing determines the dead center location of the clutch disc.



The alignment could be checked when you are next down to the flywheel (on the engine). Set up a dial indicator and pull the solonoid wire so as not to fire up and engage the starter as you also watch the dial indicator.



If your treasure pile includes a block and crank, bolt the flywheel on that and turn it (by hand) for a precision look (using the dial indicator) at the alignment.



James



Edit: Remember that the magnet will catch the larger pieces of metal. Generally they won't run out with the lube.

 

[RTRAM]

I took it back to the shop. They said the extra noise was due to the new input shaft mating with the rest of the gear train and the bearings were wearing a new wear pattern. I changed the oil to Valvoline 5W-30 synthetic and added the extra quart. I took a sample and will send it out to see whats in it. The noise is mainly in Neutral.

 

[MMeier]

Keep us posted.

 

[1stgen4evr]

and the bearings were wearing a new wear pattern.





Hummmmm. It would be poor procedure if a new input was mated to an old bearing. Sounds like an excuse to get you to go away.



James

 

[dpuckett]

Anytime a mechanic says something has to "mate" or "readjust", etc, they got something wrong. My g/f's Dakota has a hesitation problem at certain load/ throttle positions from day one. Tech at the dealer said the PCM had to "learn" her driving style to optimize engine performance and economy. I nearly fell out of my chair. :-laf:-laf:-laf I still think a sensor is within spec, but not in a continuous increase- spikes at certain times, throwing the PCM off track. But her boss doesnt have an analog multimeter (or analog anything for that matter), so it cant be tested.



DP

 

[RTRAM]

I took and oil sample and it went out today. I will keep you posted when it comes back. Even though I changed to 5-30 but it doesn't seem to be any quieter. I am sort of leaning toward the throw out bearing at this point, but I will wait for the oil sample to see if there is much metal in it.

 

[GIT-R-DONE]

If I were a bettin man, and I am, my geuss would be the throw out bearing is bad. I had the same thing with one of my previous 1st Gen trucks and it did the same thing. Very noisy with the clutch out in neutral. I too just had the transmission rebuilt and the dealer installed a "new" throw out bearing. They also reinstalled the original one and all was fine. I also won the bet on that one and it didnt cost me a dime to get them to change it back.

 

[RTRAM]

I got the oil analysis back on the trans.

Iron 101

Lead 16

copper 30

aluminum 18

silicon 30

boron 118

sodium 242

magnesium 529

calcium 1387

magnesium 529

calcium

1387

phosphurous 1352

zinc 1288

moly 12

potassium 44



Also, this was supposed to be 85-90 weight, but the analysis said that was incorrect. It did not give me a corrected weight



This is after about 5,000 miles, with no read load.



Are the metals that high?



If the metals are good, then I am looking at the throw out bearing being bad. Could it me rattling around due at being loose for some reason and then when I put the clutch in it puts pressure on it??



Any thoughts are appreciated

 

[glhs]

The noise you have described is identical to mine. I had the Getrag rebuilt and made no difference.

The noise was coming from my South Bend clutch. It is normal but noisy. With clutch pedal engaged it was also quiet.

Peter has sent me a quieter version.

Which clutch do you have?