Ok before everyone blast me like they usually do on questions like these, give me a chance.

I have a 88 22re 4x4 and I want to change oil in my tranny, T-case, and diffs. I have searched forums for hours and cant find anything on the 22re, its all V6 info. I do not have a manual with my truck and I need help.

Correct me if I am wrong but I think I am going to
A.) Put MT-90 in my transmission (how many quarts??)
B.) 75W90 in my transfer case (how many quarts??)
C.) 75W90 in my diffs (how many quarts??)

 

Fill until the oil comes to the bottom of the fill hole. You will be able to feel it with your finger.

 

Diffs hold about 2.5qts and the trans holds about 3.5 qts

 

A.) 3.2 quarts.
B.) 1.7 quarts.
C.) Front 1.7 quarts, Rear 2.3 quarts. And the FSM recommends SAE 90 or 80W-90 GL-5 for both.
D.) All found in the 88 FSM.

 

See page MA-13 of FSM
Manual transmission oil: 75W-90
Transfer oil: 75W-90
Differentials: 90 in warmer climes, 80W-90 in cooler climes

Someone also brought up a good point: Use same oil in MT and transfer case, in case there's a leak between the two.

PO probably did not drive in 4WD enough that it seems like my front diffferential seals are a little dry. Now shopping for straight 90W; thicker so less likely to leak.