^^^^ x 2 ^^^^

 

The reason the fill hole is higher on the aftermarket covers is that most people who buy them have lifted jeeps. When you lift your jeep the dif tilts and the conventional location for the fill hole is too low to properly fill the dif. Follow the posted diagram and you should be fine.

 

I used the picture posted with the line as a reference in relation to the axle tube. I marked my ARB dipstick where that line would be. Like stated, the amount in pints/quarts related to stock goes out the window when you mod. Aftermarket are usually bigger, and when you rotate for pinion angle the fill hole thing is out the window too.

 

And one more thing (like there isn't always) ....

When you tilt the axle with a lift you also increase the pinion angle (relative to earth). The pinion bearings are then higher and could be less lubed.

If this is the case, not only aftermarket diff covers would be affected.

Maybe a lift designer could chime in.

 

Im not the OP, I logged in to post a message nearly identical so I chimed in...

My setup is Dynatrac Pro Rock D44 in front and D60 in the rear.

The diff covers are the heavy duty standard Dynatrac Pro Rock diff covers.

In the front D44 it was designed for lifted JK's and has the angles adjusted, Dynatrac has a whole right up on the Pro Rock setup on their site.

In the D60 there is a second fill hole on the very top of the diff case, but it's not on the diff cover...

matthew

 

Could be. I would think the pinion bearings are rotated but not higher. But that is assuming they are somewhat centered in the housings. I think we do need a diff expert. I wasn't trying to give the impression I was one, just trying to point out why the fill hole is higher.