Sandemonium

I just changed my the gear oil in my Front & Rear Differentials out at a little over 15K using Mobil 1 75W-90.

I have an '08 6.7 2500 QC 4x4 Auto with a Carli Lift.

The front diff took about 72 oz with the level being about a 1/4" below the hole.

On the rear I could only get in about 108 oz with the level being about 3/4" below the hole.

The recommended amount for the rear is 135 oz.

What should I do?

Add 27 oz to get the recommended amount in or go by the 3/4" from the bottom of the hole? 3/4" is what is recommend by using the mark on the rear differential cover.

With the suspension lift could it have caused the pumpkin to rotate that much to affect how the gear oil level should be measured?

Thank you all for your help, I just don't want to mess this up.

Bob

Jim W

I believe that if you use this site the correct amount of fluid to be used is listed. http://www.amsoil.com/scripts/runisa...msoiloaf:index. List your truck year and then click the build list, then drill down at the bottom of the fluid types are fluid capacities are listed.

Sandemonium

Jim W thank you for the reply, the site states that my rear differential will take 8.9 pints which is a 142oz, however it still does not answer my question.

When refilling my rear differential I was only able to get 122oz in before the fluid started coming out of the fill hole.

Since my truck has a Carli lift which includes a 1" rear spring pack. Would that spring pack rotate the pumpkin and not allow the full amount of fluid to be installed.

I am not sure how else to ask the question, but do I go by the fill mark on the rear differential cover or the number of ounces that is required by the manufacturer for the proper fill amount?

Thanks again for the reply it was helpful.

Bob

Lil Dog

Fluid volume is going to have an affect on heat control for the differential. I would try to maintain the correct fluid level to the fill hole and be somewhere in between the recommended amount and level. I would double check the fluid capacity that is reported.

How much came out? I know that would be hard to measure, but just wondering if you had the extra 20oz in there before.

Ace

But where's the fill hole, now that a lift has raised the pinion and rotated the fill hole in back downwards?

That is the question. The answer is: It doesn't matter. Get the recommended amount of fluid in there, by parking it facing downhill, if necessary. That's what I used to do with my 1st gen when it had a similar issue before I installed a Mag-Hytec cover with the fill hole on top. The supplied dipstick on that now reads way over full with the correct amount of oil in it.

Why doesn't every manufacturer take into account what any owner or other manufacterer may do to the equipment to alter their specifications or procedures? (Rhetorical question! )

nelrod

^^^^^^ I would do just that, park it downhill and put in correct amt.

Jim W

You could do what I and a lot others have done and that is to install A Mag-Hytec diff cover. This has four openings in the AL cover I believe. One is for a temp gauge, another is for a fill/dipstick on the top, the third is in the center and a drain plug on the bottom. No more un-bolting the cover to drain fluid just open the drain plug. With this style of cover you get increase oil volume and the angle of the diff does not matter if it is rotated. I did use 8 quarts of Amsoil for the rear diff. Just my $0.02