T-90 fluid fill issues

Hey guys,

I've got a '63 CJ5 with the F134/T90 setup. The problem I'm having is that my HAYNES manual doesn't tell me is where the tranny or transfer case fill is. I assumed the transmission fill is on two plugs on the drivers side (upper and lower) and the transfer case is on the passenger side. Funny thing is when I opened what I assumed was the transer case drain on the bottom through the skid plate, fluid came out, but I hadn't filled the transfer case yet, only the transmission. So either that is the transmission drain or my tranny fluid is seeping over into my transfer case? I don't know. BTW this transmission has been fully rebuilt. So my question is- Is the tranny fills on the driver's side and transfer case on the passenger? And what is that bottom plug to? Any help is appreciated!

Sincerely,

Confused (aka Leathernek)

 

The fill plugs are about halfway up the cases on both the transmission and transfer case. Transfer case is on the passenger side. Don't remember on the T-90 but should be obvious. Drain on the transfer case is directly on the bottom of the pan and you reach it through the skid plate as you noted. Drain on the transmission is on the bottom but sticks out sideways from the transmission case. Lube flows between the T-90 and 18 transfer case.


Sent from my iPhone

 

Thanks for the help! You said, "Lube flows between the T-90 and 18 transer case." Does that mean that they both take the same lube? If so, what is it? Because I believe that my haynes manual has failed me again! :/ (It says the tranny takes 75-90 and the transfer takes 80-90)

 

I run sta-lube 85w90 gl4 (http://m.napaonline.com/parts/PartsList.aspx?k=SL24239). It should be readily available at most napa's. The gl4 rating is a must for both.

 

So do they both take the same fluid?

 

Yes that is correct

 

Yes.

 

anyway you should fill each one. that is what i do ...

 

Yes, don't depend on the oil sharing for filling. Transfer rate is slow.

 

Well, there's no seal on the bearing, so oil goes through the bearing too.

From previous discussions, I recall that the transfer case ends up "overfilled" after a while - becasue of the difference in the fill plug levels. But it does not seem to hurt anything.

 

Thanks for the help guys- I went with GL5 80-90 in it.

 

I'm pretty sure GL5 is a no-no???

 

I'm not sure if the T-90/D-18 in your Cj5 has the same metal types on the insides as my my CJ2a (also with T-90 and D-18 ), but putting GL5 in the transmission/transfer case of a 2a is apparently very bad due to the types of metals on some of the transmission parts. There was a nice thread on this a while back on The CJ2a page. I don't want to try and drive traffic away from these forums, but there seemed to be some good information there. The end result, was to use GL-1 Mineral Gear Oil, after folks asked several oil companies. If you'd like to see the discussion, it's here in the link below. But the result, was to use GL-1. Most folks ended up getting it from Napa in 1 or 5 gallon pails.

http://www.thecj2apage.com/forums/correct-transmission-fluid_topic19422.html

I ended up getting a 5 gallon pail of the 90w GL-1 MINERAL GEAR OIL from Napa. I went through two cheap hand-held pumps that just were junk, one of them wouldn't even pump, the other exploded on me (both apparently were supposed to work with Oil). So I tossed those cheap plastic pumps and got a good metal one that replaces the entire lid of the pail, and it works like a charm. Checking the fluid level in the 2a is no longer a chore anymore

 

There was a long thread on this site too, regarding GL ratings and sources for the right kinds. Just a couple of weeks ago.