Been chasing a loud whine in transfer case along with a fair bit of slop/lash. I just started pulling it apart and it appears that the output gear splines are pretty loose on the shaft. I have heard that the output gears and bearings are not supposed to be tight on the output shaft, but this seems different. Can anyonne comment on whether or not this is acceptable? I've heard of this type of movement due wear on the input gear, but not on the output. Thanks!
Transfer case output spline wear? (2 Viewers)
- Thread starter slow62cruiser
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To my understanding that’s okay.
I’m not sure though.
I’m not sure though.
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Firstly the output gear doesn't have splines, it's driven by the hi-low dog collar. They are about $45 new and I always check for play in them when doing a rebuild.
That being said they do have some, even on a completely brand new case.
Secondly that gear in your videos is the low speed output gear, is your case sifted into Low when you filmed that? If not, then the dog collar isn't engaging that gear to the output shaft.
That being said they do have some, even on a completely brand new case.
Secondly that gear in your videos is the low speed output gear, is your case sifted into Low when you filmed that? If not, then the dog collar isn't engaging that gear to the output shaft.
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CenTXFJ60
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What Matt said is spot on. Another thing you should check is the output preload. Put the output cover back on, torque it and follow the steps in the FSM. You can also pull the input cover and verify the stake nut is still locked in where it should be. Lastly, I’d pull the PTO cover and do a visual on the gears as you slowly roll the output shaft. there’s a spec on thrust play on the idler gear that can be checked via the PTO opening as well.
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- #6
Thanks for setting me straight, very helpful. I believe it was in high when it was filmed which makes sense with what you are saying.
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- #7
I'll check it out. I have done everything you describe except checking idler/thrust washer clearance. Will check that out this afternoon. Thanks for the tips and FSM reference!
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How many miles on your transfer case? Original bearings or no? Typically whining noise is going to be from worn bearings or gear set.
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- #9
About 200k mi on the case. Bearings are fresh. It was rebuilt ~10k mi ago with a new input gear and new H55f in front of it. It whined before the rebuild and I expected it to fix the whine, but there was no change. I think the new gear could cause some noise, but the whine is exactly the same as before the rebuild, so I doubt it is that. Figured it could be the rear diff piping the noise up the DS, so I had that inspected, but it was confirmed to be the transfer case.
The whine is really loud. It's loudest thing in the cab (despite dynamat in the floor and ceiling), so I'm very motivated to solve it.
LazarusTaxa
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is the whine coming from your rear diff?
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- #11
No, the rear diff was disassembled and inspected- it all looked good. Also put it up on a lift and listened to the diff and it was quiet.
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You should listen to the video in this thread and compare. So far no (posted) resolution on this one.
forum.ih8mud.com
Shim set for transfer output shaft
I have a questionable perceivable click when pulling back and forward on my transfer output flange, which makes me question the preload on the bearing. I have the original shim but the bearing changed a couple of years ago. Sooo, I wanted to reset the preload. To do so I would love to find a...
forum.ih8mud.com
If a gearbox (TSM, TFR, DIFF) runs low on oil long enough sometime in its life, the gear faces (contact area) can wear to the point where the contact patch gets flatter and bigger. When this happens, the gear pair can be noisy for the rest of their life.
It’s really common in differentials that ran low of oil for too long. They can get really noisy afterwards- forever, though are ok to still use.
It’s really common in differentials that ran low of oil for too long. They can get really noisy afterwards- forever, though are ok to still use.
CenTXFJ60
SILVER Star
hard to beat brand new gears. Did this on my 60 last summer as well as another friends 60.Yeah that's possible given some of the other stuff the PO did to the truck. When I get the case open I'll post some photos of the teeth. Is this something that can be inspected visually?
Maybe a good excuse for a regear
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- #16
Finally got the case split today. I think I found the culprit of the whine.
The teeth on the idler gear that interfaces with the input appear to be pretty worn. Perhaps if the input gear moved a lot because of worn splines, it could wear the teeth like this. The other gears look okay, bearings, idler shaft, etc. all look great.
Any opinions on these teeth?
The teeth on the idler gear that interfaces with the input appear to be pretty worn. Perhaps if the input gear moved a lot because of worn splines, it could wear the teeth like this. The other gears look okay, bearings, idler shaft, etc. all look great.
Any opinions on these teeth?
CenTXFJ60
SILVER Star
That idler gear looks rough. Here’s a shot zooming in on the brand new one I put in my case back in June. Good news is all these gears are available and with a new bearing/gasket & seal kit you’ll be on your way.
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New input gear (definitely upgrade to the long-spline version if you haven't already) and idler gear should definitely quiet that up.
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- #19
Ended up going with all new gears. It was a bit of a pain to do on the ground, but it sounds amazing now that it's all back together. Thanks everyone.
Great that you got it figured out. I’m fighting what sounds like a similar whine. Out of curiosity, did you replace both the high and low gears? Or just input, idler, and high?
