T15 noise

Any thoughts about using brake clean to clean out the transfer case?
And on the oil side of things... I have an abundance of 80w90 gear lube from the my work. Is that ok to use in my transfer and Trany? What about in the diffs?

I also have been doing some reading about gl-4 and gl-5 is it as crucial as it sounds to run gl-4 instead of gl-5?

Thanks again,
Jake

 

I see a fair amount of pitting on the gears. That could be part of it.

From the stuff I've read about the gear lube for these things, the GL4 seems to be the way to go. I was able to find gallons of Sta-lube GL4 at NAPA and my trans and T-case are silent.

 

I took the top off the trans and flushed it out with some clean gear oil then replaced the top and replaced the pan on the t case. And filled with clean gear oil drove it around for 10 or 15 minutes... (Noise still just as loud) is this long enough? Should I drain the oil and replace it with clean oil? I bought some gl4 from napa but it wasn't cheap so I don't want to add it if I'm just going to drain it right away...
Thanks, jake

 

lucas additive will quiet a noisy transmission.

 

Will it work for a noisy transfer case as well?

 

They share the lube so what you put in one will mix with the other.

 

Additives mask issues not fix them. Time to pull it apart and fix it right.


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never said it was a fix just that it would make it quieter...

 

My point was that the longer you wait to repair it the less there will be to rebuild when it is torn down. Masking the noise makes the problem worse because it gives a false sense of security because "it is quieter so it must be ok". The longer the wait the more expensive it's going to be to repair it. Not only cost is a factor but availability of parts. I see it constantly with customers transmissions.


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I was afraid of that... I already ordered a seal kit for the transfer case (I needed the pan seal) what else should I order? Or do I need to have it completely torn apart before I can figure that out? Should I do Trany and t-case at the same time? Or just the t-case and see if the noise goes away?

 

Might try the transfer case first and see what happens. Unfortunately if it doesn't fix it you are pulling it twice. I think I'd pull the transfer case pan and take a look inside before removal. You could check for play in the intermediate gear which is a common noise inducing problem.


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When you say play? I have some play forward and backward on the shaft but none side to side. Should I have that play? Is rebuilding a d20 reasonably simple? Time consuming? Expensive? Should I send it to be done at a shop? Or maybe just buy one of the 6 that are on Craig'slist for 150 and hope that they are better than what I have?
Thanks, Jake

 

do you have the factory service manual? it isnt too hard to do and the factory book has some good blown up views. its online here http://oljeep.com/edge_74_tsm.html

 

Well a little over a year later I have finally pulled the transfer case and replaced it with a freshly rebuilt one. Unfortunately the noise remains... with every thing in neutral I can hear the noise when I put my ear directly on the transmission shifter. The noise disappears as soon as I push the clutch, and returns when I let out on it. And is increasingly loud with higher rpms... any new thoughts or advise? Pulling and replacing the t case alone and without a transmission jack was no fun at all, so I wanted to ask first before I start pulling again...
Thanks
Jake

 

If everything is in neutral then the only thing turning inside the T15 is the mainshaft bearing (AKA input bearing), the countershaft rollers and the second speed gear.
The second speed gear is most likely quiet.
The countershaft rollers are most likely the source of the excess noise.
The maindrive ball bearing is also a real possibility.
It's plausable that the maindrive or the maindriven countershaft teeth are in rough condition not to mention the 2nd speed cluster drive and mainshaft driven teeth.

 

So what I am hearing is transmission rebuild next?

 

The noise must be coming from something that is spinning (in motion).
You also state the noise is RPM related.
The transmission mainshaft (output) does not spin when the T15 is in neutral.
The noise must be the engine, the clutch or the transmission.
If it makes no noise with clutch lever pushed in (disengaged), then it must be the transmission parts that are in motion with gears in neutral position.