T-14 Transmission/Dana 18 Transefer case

[Hedgehog]

This is for a friend with a very nice '69 CJ5 with a V6 and atlas Overdrive .

My T-15 /Dana 20 share oil/grease through their open cases. Does the T-14 /D18 have a similar arrangement? He is running different oil in each box. I'm thinking he might be wasting his time, but maybe not.

 

[Hedgehog]

Can it be that nobody knows the answer to this question? Somebody must have rebuilt their T-14 .

 

[oldjeeplady]

Our other build has a T-14 /Dana 20 combo, but I don't know if checking that will help. You probably know this, but in the FSM it clearly states that the 4 speed Transmission has no cross-over oil passage. It does not clearly state that the 3 speed does, just that some transmissions do. It doesn't answer your question. You could also put the question on EarlyCJ5.com and see if you get a better response. Sorry...

 

[Hedgehog]

Yep the T-18 doe not share oil, the 3 speed T-15 does. The T-14 looks a lot like a small T-15 .

I guess the cases aren't exactly open, but the bearings are open and oil definitely flows between the cases.

 

[Torxhead]

I would think of it as a poor design if they do flow between the cases and it would be a good plan to prevent the flow.

 

[Hedgehog]

A 50+ year old design is a 50+ year old design. It can't really be changed now. With that being said, I agree and very much like the idea of my T-18 and Dana 20 being completely separate. Some of the T-15 /Dana 20 Transfer Case over flowing problems are related to the flow between cases. .... On a side note, both cases have their own drain plug and filler. ...... At least one CJ owner told me that they fill the Transmission , with the top popped off, with the amount of oil for both Transmission . and Transfer Case then let it sit for a while to drain from one to the other.

 

[Torxhead]

That's an interesting way to fill up. I would be concerned with lubrication on a long uphill or downhill grade though. Would it have been a factor? You also mention overflowing problems, What would be the effects?

 

[Hedgehog]

They have been discussed here from time to time. I bet the gears turning move the oil around sufficiently in most cases. With my T-15 drive train I've always wondered about steep terrain. I bet driving keeps the levels where they belong, but what about parking on a very steep hill. Seems to work, exactly how I do not know.

 

[mstar]

my T-14 /D18 combo lets oil migrate slowly from Transmission to Transfer Case .
It is a pain because eventually the Transmission is low and t/c overfilled.
I have been told that back in the day they would install a sealed mainshaft bearing on Transmission .This would do the trick and if I ever have it apart I will look in to it. The overfill helps lube O-drive so not all bad.It's the speeedo that wanted to leak . Someday maybe I will figure it out. For now I just top of T-14 and forget about it.

 

[Torxhead]

Mstar, I think Advance Adapters might have what you would be looking for.

 

[mstar]

Mstar, I think Advance Adapters might have what you would be looking for.

thanks for the info .I will check it out. mike