I'm gonna do some tune-up stuff this weekend, and I need to know what type of trans fluid to put in my AW4. I've heard conflicting opinions, so what are you guys running? Also, what weight gear oil should I use for the front and rear diffs (and how much do I need)? Any additives or anything I should get as well? I'm not a big additive guy, but if there is something that works like it advertises I'll give it a try. Thanks guys.

 

Trans takes Dexron/Mercon same in the T-case and the diffs run 80/90 or 75/140. If you have posi you will need a friction modifier in the diffs. If the diffs get heavy use, like a lot of trailer towing i would go with the 75/140 synthetic

 

x2.. The only thing I would add is make absolute sure you are getting dexron III or IV. Dex 6 is COMPLETELY different and not intended for your tranny at all. Dex III is the best one, but it is becoming harder to find. A good quality fluid should be purchased not some el-cheapo convience store brand.

The T-case is the same as the tranny. Good quality Dex III is the best.

The diffs look for a GL-4 if available. A GL-5 will work, so will a GL-3, but no GL-6(extremely hard to find). Good products here need no additives, except in the case of a Limited slip unit in the dif. Then 4 oz of LSD addtive to the fluid is the recommended amount.

 

How much of each fluid do I need?

 

Consult your owners manual. As for the differentials fill to the inspection hole.

 

Don't have an owner's manual, or I wouldn't be asking. I also don't have a Haynes, but I could probably find one at work tomorrow. Just figured someone would know off the top of their head.

 

Tranny... for a service change 4 Quarts
Diffs front...2.7 pints(1/2 inch BELOW fill plug)
Diffs rear...D-35 3.4 pints(to the fill plug)
Diffs rear...8.25 4.2 pints(1/2 inch below fill plug)

 

How about the transfer case? I got 3 qts of fluid for it, so hopefully thats enough. If not I'll get more tonight.

 

Well there you go, the transfer case uses the same ATF DEX 3 or 4 and you fill it to the inspection hole like the diffs.

 

More than enough...

NP 231 2.1 pints
NP 242 3.0 pints

Dex 3 or 4, whatever you chose for your tranny.

 

Skarpenz I think you have more than enough info now to do a fluid change unless you need to know how much blinker fluid you need too.

 

Blinker fluid?! Ooh no! That must be my problem! lol