How Much Fluid?

[HDdave]

Well I hope to change my differental and transfer case fluid today and replace it with Mobile 1 synthetic atf. I just need to know how much fluid I will need to fill both differentals and the transfer case. Thanks in advance guys!

[2500HD 8.1]

Front diff takes a little less than 2 quarts. Rear takes almost 2.5 quarts, so you might be able to get away with four total but might need five. I havent done my trans yet but it should take 5-6 quarts with just the pan drop and filter change. I think 16 total with a complete flush.

[HDdave]

Well I'm not changing the tranny fluid, just the transfer case and differentals. The only reason is sounds like your talking about the transmission is because you mentioned a pan drop and filter change. And it doesnt look like the transfer case would take 5 or 6 quarts..

[2500HD 8.1]

Transfer case takes 2.5 I believe. Sorry I didn't read. I did it years ago, but I forgot. I'm changing my transfer case and trans next week if it doesn't rain. Mine both take Dextron VI synthetic trans fluid, so I got 8 quarts to cover the trans and transfer case. Check with your dealer because your transfer case probably takes the blue Autotrac II fluid. I have a 1/2 quart left from doing my Suburban a few years ago, and I believe I bought 3 quarts. I would pick up 3 cuz I think it will be a little over 2 quarts to fill. Good luck.

[HDdave]

Ok, Is the fill plug on the transfer case the one that is about 4 inches up from the bottom on the back side of the t-case? There is another one at the bottom of the case that appears to be the drain plug to me... The one that is about 4 inches up had that blue stuff sprayed on it....

[maintmech]

Ok, Is the fill plug on the transfer case the one that is about 4 inches up from the bottom on the back side of the t-case? There is another one at the bottom of the case that appears to be the drain plug to me... The one that is about 4 inches up had that blue stuff sprayed on it....

 

The fill plug is on the back side of the 'case, up a couple of inches from the bottom,the blue stuff is just an indicator marker, don't use any teflon tape on the plug.

 

maintmech

[2500HD 8.1]

Fill plug is the top one on the backside and the bottom is the drain plug. I just changed my transfer case fluid, and it took a little less than 2 quarts. About 2 full quarts came out, it actually drained a little from the fill plug too, but it would not take a full 2 quarts. Pretty easy change.