Just fill trans & tcase until oil runs out of fill hole.

Not sure what you are calling the "4wd unit" so can't answer that.

 

After some clarification he used 4wd unit and t-case interchangeably and I didn't realize it. See, told ya I am far from a mechanic. I've got a long way to go.

 

You need to buy a copy of the REAL Factory Service Manual(FSM), NOT Haynes or the like.
What 4 speed do you have?
Conform this is NOT a "Q" trac drive line.
Can you post pictures for us to guide you??
LG

 

I will take/post pics when I can, The jeep is at his house along with the Haynes manual I got from the auto parts store. It in the in-line 6 engine and I believe it is a t4 transmission. Don't know what a Q trac is. Does that have to do with being the wide or narrow base? If so, this is the wider axel. Best suggestion for finding the factory manual? Found some postings that say to call the factory but then the factory gives you the run around, etc.
Just for my own understanding and because in the future I'd like to not be as ignorant/uneducated as I am now: What are the identifiable and mechanical differences in the t4 and t5 other than being either 4 or 5 speed?
Thanks!

 

Q-trac is referring to a Quadratrac transfer case. Its a full time case used behind automatics mid to late 70s.

The difference between a T4 & T5 is the T4 is a 4 speed & T5 is a 5 speed. Neither of which were offered in 1980. But that doesn't mean you don't have one; after all, the wide track axles you say you have weren't available until 82.

 

If your reverse is "left and up" the the transmission is an SR4. If reverse is "right and down", then its probably a T176. Both were transmissions used in 1980. As stated above, 1980's came with "Narrow Track" axles. Again, I'm assuming everything is stock but previous owners could easily replaced transmission/axles and who knows what in your CJ.

 

T4 tranny then use 75W-90 syn!
LG

 

Thanks for the info! I know the axles aren't original. I'm fairly certain I have a t4 b/c it is a 4-speed and reverse is right and down and the shift lever is curved. We also had to replace the back-up lamp switch which is the one that fits the t4, t5 and sr4. I think by process of elimination I've backed my way into figuring out its a t4.
When I got this jeep it was about 2 months away from the junk yard and I've been fumbling my way through it but the more I do the more I want to do and the more I want to know.

 

You can find the Factory Service Manual for the 1984 to 1986 CJs on line, which will cover what you need for a 1980. Many respects to Chet for having posted it up. The last time I looked the first part was at http://www.civilianjeep.info/84-86FSM/A-General.pdf

It is about 85% there and has all sorts of info.

You can also find the 1981-1986 CJ7 Parts Manual somewhere on line. Great diagram in there of the different gearboxes.

Do not pay for either, enthusiasts make them available to other enthusiasts because they want to help. This is in huge contrast to the Jeep dealers!!!

If it is the T4 it is vital you research the differences between fluids. The T4 is prone to failure with the wrong fluid and much has been written about different fluids to use, do not just stick in the first bottle of gear oil you find.

 

Always glad to hear when a Jeep is rescued. Good luck with the project!

 

As far as the fluid goes: I have read everything from 80-90w to gear oil to ATF to Penzoil or Royal Purple Synchromesh. Also read 75w-90 helps with older trans and helps them shift smoother. I'm almost at the point where I'm afraid to put anything in it lol. Can someone clarify which fluids were once recommended but then recalled, etc? I might have done TOO much reading and just confused myself even more.

 

If it is a T4, you want to use ATF.

 

NOPE-------That's what AMC did against BW's recommendation. They replaced allot of trannys.
Use the 75W-90 syn. It works.
LG

 

There was a special AMC lubricant introduced in the early 80s for the T4/T5 because of warranty claims, stank like dead fish so not ATF. No longer available.

The T4/T5 were fitted to a lot of vehicles in the period so there is a lot of discussion out there. Most important that the bronze bits do not disintegrate from the fluid.

I have heard some owners use ATF but there are others.......

 

Alright, so which fluids will be ok for the internal bronze parts? And what is going to help smooth out the shifting? I don't understand all the different possibilities and each of their pros and cons.

 

Also, I am pretty sure it has a Dana 300 t-case based on the pattern: 4low in front and N, 2high, 4high in the back. Does that make sense? Does that make a difference in fluid type or amount?

 

Use std gear oil 85W-90.
LG

 

I initially went with 90W gear oil when I first swapped a T5 in my '81 because that's what I always thought went in a manual transmission. It worked okay, but shifting was not the best.

When I went to change the oil, I read in a manual for an '84 that came with a T5 that the recommended fluid is ATF.

I tried it, and shifting improved considerably.

 

After much research ( on this site and others ) , I ended up using NAPA GL4 (part number # SL24239 ) in my SR4 which is basically the same as the T4. Its been in for several years with no problems. Supposedly safe for the brass/bronze parts.

 

NOPE-------That's what AMC did against BW's recommendation. They replaced allot of trannys.
Use the 75W-90 syn. It works.
LG

Um... I wish I would have known that. Thanks for the info, I'll put that on the top of my list of things to do.