Rear diff capacity

[Dmax650tq]

How much fluid does the rear diff hold on a 3.73 rear end?
Does anyone know what size ring gear this rear end has?

Thanks.

 

[michael nelson]

I think it is 4 quarts and I want to say 9or 91/2"

 

[Ragindiesel]

4 qts bud!!

 

[michael nelson]

91/2"...google confirmed-

 

[Dmax650tq]

Thank you much for the info.

 

[tinypeckerwood]

I think the ring gear is more like an 11.5. I don't think a 9.5 would hold up to the dmax torque.

 

[stacks04]

ring gear is 11.5 inches. lol.

 

[RayMich]

The rear axle ring gear is 11.5 inches and the housing holds approx 4 quarts of fluid.

 

[Dmax650tq]

I changed it and it took all 4 qts. That left it right at the bottom of the fill hole. I drained almost 3 qts. out of it. The fluid didn't look bad or smell bad. The drain plug had some fines, but nothing alarming.

I do feel better now that it has 4 qts. of Mobile synthetic.

Thanks for the replies to my questions.

 

[btfarm]

I drained almost 3 qts. out of it. The fluid didn't look bad or smell bad.

1) If you had that much from the factory I'm surprised. Usually it's 2-1/2 at best.
2) But did it smell like grape juice?
3) Good choice with the Mobil 1.

 

[Dmax650tq]

1) If you had that much from the factory I'm surprised. Usually it's 2-1/2 at best.
2) But did it smell like grape juice?
3) Good choice with the Mobil 1.

1) It was somewhere between 2-1/2 and 3, I didn't measure it precisely. I poured it into 2 quart containers for recycling. It filled one and went between 1/4 and 1/2 on the second container.

2) It really didn't smell like grape juice to me. But then it really didn't smell like regular gear lube either. I don't know. But I have smelled burned gear lube from a hot diff and it didn't smell like that, so I was happy:thumbsup:

3) Thanks, I'm going to put Mobile 1 in the front diff also.

 

[stacks04]

oh if the syn was burnt the whole neighborhood would have smelt it.

 

[Matt Bachand]

I am thinking of doing this to mine also. Good info.

I'll get 4 quarts of mobil 1 gear oil, ... any procedure specific, or just open drain plug and drain, .. then jack up each tire to get the oil out of there?

 

[Dmax650tq]

Nothing specific. Drop the old fluid out the drain plug on the bottom and add new in the fill plug. I did drop my spare tire to make room for adding fluid, since I didn't have a pump available. That made plenty of room to tilt the plastic bottles of Mobil 1 and fill the rear end. Drain pan sat under the rear end and I didn't have to jack up the truck at all. Very easy.

 

[RedSoxFan]

oh if the syn was burnt the whole neighborhood would have smelt it.

Oh yeah!!!!! I did mine this weekend and put on a slick Mag Hitech diff cover. That oil must have been boiling at some point because it stunk to high heaven. With the new diff cover it tooks seven quarts!!! 11:

 

[stacks04]

good. the new cover is nice. i guess if nothing else a little peace of mind.

 

[scoot]

what weight rearend oil do you put in the rearend and what is the best synthetic to run in the front and rear with what weights.

 

[btfarm]

what weight rearend oil do you put in the rearend and what is the best synthetic to run in the front and rear with what weights.

75W90 synthetic. Alot have used Mobil1 (I did) and many have gone with the factory "grape juice" (I did on my '05) but it's about $30/qt. You might check with Ashton (Wrecker) a vendor here for Amsoil products as well.

 

[truckie481]

I'm running Amsoil Severe Gear but Mobil 1 is good oil as well.

 

[83GMCK2500]

I'm running the Amsoil Long Life 75W-90 front and rear in my truck.