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Old 06-01-2011, 07:28 PM   #1 (permalink)
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Grease pushing transfer case

Guys,
I have "one" I am hoping someone out there can help me with.

I have a 1987 Jeep Wrangler that I have dropped a Chevy 350 into that is bolted up to a turbo 350 automatic transmission and a Dana 300 transfer case.

My issue is, when the system warms up, the transfer case pushes the grease up and out the vent tube that runs up to the top of the fire wall.

Now a couple of things to note;
#1 From what I can tell, the tranfer case has not been overfilled.
#2 I did not "clock" the transfer case in its stock position where the right side hangs down lower just a bit. What I did is roate it counter close wise in order to get more ground clearance. Doing this more than likely leaves the gears all sitting in grease, which one would think is a good thing.........right?

My quesiton is, with the transfer case being "clocked" in this manner, could the gear rotation itself be pushing the grease out the vent tube?

Any other ideas out there fellas?

Thanks for any input anyone could offer up.
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Old 06-02-2011, 10:06 AM   #2 (permalink)
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Shouldn't be grease in a D300.

Yes, gears can sling gear oil hard enough to get into the breather tube.

You can relocate the fitting for the hose to the fill plug and see if that helps. Search the Cherokee area for Flipped D300s. It's a pretty common issue.
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Old 06-02-2011, 10:08 AM   #3 (permalink)
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Quote:
Originally Posted by Johann View Post
Shouldn't be grease in a D300.
this
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Old 06-02-2011, 10:22 AM   #4 (permalink)
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I believe he is using the word "grease" loosely, and doubt he actually filled his case with a tube of grease.
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Old 06-07-2011, 04:07 PM   #5 (permalink)
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Guys,
I guess I did you the term "grease" a little loosely.
Heck everyone knows grease goes in the windshield washer reservoir, right?

Seriously thought, the transfer case does have gear oil in it. I have checked the level many times thinking that it would get low enough it would just stop, but I also did not want it to get too low of course and damage the gears.

I appreciate the feedback on the subject. I will check out the Cherokee link and see if I can find something there in the form of a "how to".
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Old 06-10-2011, 08:12 PM   #6 (permalink)
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How much are you actually putting in?

I have roughly 2qt in mine from empty(mine is clocked as well... hanging just slightly lower on the side compared to the center) and no problems.

What size hose are you using for your vent? Try a larger size hose... less restriction = air can get past the oil so it doesn't get pushed all the way out the top.
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Old 06-16-2011, 03:24 PM   #7 (permalink)
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Wink

Thanks Flatlander757 - I had not thought about the tubing size. I will be sure and check it out this weekend and let you know. I think I am also going to post a photo of the transfercase for reference as well.

Thanks again.
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Old 06-25-2011, 09:44 AM   #8 (permalink)
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Transfercase pushing gear oil out

Ok - so vent tube is 11/32" i.d.
Should that be larger enough to allow air to escape?

Any thoughts or next steps I should take?

After looking this over a while, I was wondering if the exhaust could also heat the transfercase up enought to cause this. It seems really close too although it does have a heat sheild between the two.

I was going to post a couple of photos of the transfercase but have not figured out how to add just yet. I did post some photos in my album in my profile if you want to take the time to look at them

Thanks.

Last edited by Mudhole; 06-25-2011 at 09:56 AM.
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Old 06-25-2011, 10:43 AM   #9 (permalink)
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Quote:
Originally Posted by Mudhole View Post
Ok - so vent tube is 11/32" i.d.
Should that be larger enough to allow air to escape?

Any thoughts or next steps I should take?

After looking this over a while, I was wondering if the exhaust could also heat the transfercase up enought to cause this. It seems really close too although it does have a heat sheild between the two.

I was going to post a couple of photos of the transfercase but have not figured out how to add just yet. I did post some photos in my album in my profile if you want to take the time to look at them

Thanks.
I doubt the exhaust is an issue... see this pic:



The exhaust pipe literally rubs on my t-case

This is the only decent one showing the clocking angle... this was before the exhaust was done... it is run on the passenger side... very little room:



Do you have the standard rear output on your D300? I have the AA 32 spline rear... I am not 100% sure but I think it had a larger vent nipple and in a different location than my stock one did. Theirs is in the output housing at the top (when clocked flat) towards the back... bad pic for this but you can just BARELY see the gold nipple of the 90 degree fitting that goes there:



I want to say I remember seeing a baffle of some kind inside the HD output that would keep oil from being pushed out, but not 100% sure.
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Old 06-25-2011, 11:14 AM   #10 (permalink)
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flatlander757

I have the same output - Advance Adapters 32 spline output.

So do you think that vent tube size is OK (11/32") is OK for this?
I thinking I may put a larger one on it just to see if that does help it.

Do you think that if there is "slack" in the vent tube that could maybe help magnify this issue? I just pulled all of that out of and am taking it out later today to see if that might help.

I honestly fill like this thing has pushed some gear oil out it has to be getting low by now. I just can not fill through the fill hole at this point.

I appreciate you effort in helping me solve this issue.
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Old 06-25-2011, 11:23 AM   #11 (permalink)
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Here are a few photos finally...............i hope



https://picasaweb.google.com/1172481...23728265067906

Last edited by Mudhole; 06-25-2011 at 11:23 AM.
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Old 06-25-2011, 02:27 PM   #12 (permalink)
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I would think at the speed of temperature change in the case that even a pin hole would suffice for a vent. Have you considered a bellow type vent cover? I've been running them on my axles and case as many people do and they seem to work well.
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Old 06-25-2011, 07:15 PM   #13 (permalink)
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I have not thought of that.
I will do some research and see what I can find out about this.

Thanks for the suggestion.
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Old 06-25-2011, 09:30 PM   #14 (permalink)
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Quote:
Originally Posted by Mudhole View Post
flatlander757

I have the same output - Advance Adapters 32 spline output.

So do you think that vent tube size is OK (11/32") is OK for this?
I thinking I may put a larger one on it just to see if that does help it.

Do you think that if there is "slack" in the vent tube that could maybe help magnify this issue? I just pulled all of that out of and am taking it out later today to see if that might help.

I honestly fill like this thing has pushed some gear oil out it has to be getting low by now. I just can not fill through the fill hole at this point.

I appreciate you effort in helping me solve this issue.

That hole size should be fine... Are you sure your hose isn't collapsed or pinched anywhere?

I'm honestly just using my stock vent tube that was originally attached to my NP231 in my TJ.

How much is actually in it?

Drain it and make sure it's just 2qts... It honestly probably doesn't even need that much because in stock form that is enough... and the rear output isn't anywhere near being submerged in gear oil... it's simply splashed up from the other gears... When clocked flat it should have no problem getting the lube it needs.
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Old 06-25-2011, 11:31 PM   #15 (permalink)
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Quote:
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I have not thought of that.
I will do some research and see what I can find out about this.

Thanks for the suggestion.
$5.50 from PSC.
http://www.pscmotorsports.com/motors...-of-stock.html
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Old 06-26-2011, 05:53 AM   #16 (permalink)
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Guys,

Thanks for all the feedback.
I plan on draining the case today to determine just how much fluid in there.

Also on the bellow, would that be better servers place at the bottom of the vent tube where it connects to the transfer case or at the top?

Thanks again, I will post my findings today.
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Old 06-26-2011, 09:23 AM   #17 (permalink)
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If you have room, they normally mount right to the vent on the case, axle, etc. If it's too tight in there you can run a line and mount it elsewhere. I noticed PSC's site says out of stock, but i've seen them elsewhere for the same money.
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