ok i'm wanting to change the lube in my transfer case and front and rear diffs. wanting to know how much does it take in each and what weight to be using???
i don't think they've ever been changed

 

I'm pretty sure 4qts in the rear and 3 in the front, I'm running RP in mine... I ran 75W130 in the rear and 75W90 in the front. Can't remember the transfer case amount

 

I just changed my diffential fluids this past weekend and the numbers quoted by CountryBoy are accurate. I'm not towing much and with winter coming on I opted for the 75W90 in both diffs.

One thing to remember, the used fluid really stinks, I don't even know how to describe it. Anyway, if you can do it in a well ventilated area (outside) I would recommend it.

I did it in my garage, and after about a half hour I really didn't notice it, but my wife complained about the smell the whole day.

 

I use 75/90 RP in front and rear. The T-case takes 4 pints (Syncromax, RP, IIRC).

If/When you spill some of that on your clothes, don't expect your laundry room to smell good for a week or two. Consider using clothes you don't mind ever seeing again.

 

TRANSFER CASE: ATF +4
NV241 GENII 1.6 L (3.4 pts.)
NV243 1.6 L (3.4 pts.)
NV244 GENII 1.6 L (3.4 pts.)
NV271 1.89 L (4.0 pts.)
NV273 1.89 L (4.0 pts.)

FRONT AXLE ± .03 L (1 oz)
C205FD 1.6 L (56 oz.): 75W-90 Gear Lubricant
9 1/4 AA 2.2 L (74 oz.): 75W-90 Syn. Gear Lubricant
9 1/4 AA EL 2.0 L (6.8 oz.): 75W-90 Syn. Gear Lubricant

REAR AXLE ± .03 L (1 oz)
9 1/4 2.1 L (72 oz.) *** Synthetic Gear Lubricant 75W-140
10 1/2 AA 2.5 L (85 oz.) 75W-90 Syn. Gear Lubricant
10 1/2 AA EL 2.5 L (85 oz.) 75W-90 Syn. Gear Lubricant
11 1/2 AA Open 4.2 L (142 oz.) 75W-90 Syn. Gear Lubricant
11 1/2 AA Trac-Rite 4.0 L (135 oz.) 75W-90 Syn. Gear Lubricant
248RBI (DANA 60) 2.8 L (46 oz.) **** Gear & Axle Lubricant SAE 90
*** With Trac-Lok add 118 ml (4 oz.) of Limited Slip Additive.
**** Add 147 ml (5 oz.) of Limited Slip Additive
** Includes 0.9L (1.0 qts.) for coolant reservoir.
Recommends Mopar Fluids

 

I use RP 85w140 in the rear but I live in the Sonora pizza oven. I also used it in Co. with no drawbacks whatsoever from cold, stiffness or mpg. I also got the best UOAs from the 85-140. I'd use a minimum of 75w140 in the rear diff for the better lubrication. RP SynchroMax is the best I've used in the 6 spd.