Dana 60/70 maximum pinion angle?

How much upward pinion angle can I put in before the pinion bearing lubrication becomes a problem? I don't want to go crazy with the level, too much oil causes the axle seals to leak prematurely.

Hi , by design the ring gear will pump and fling gear oil down the top casting to channel and feed the pinion bearings . I'm sure you won't have your angle as steep as a 4X4 truck . I've seen some so steep you wonder how the bearings last , but they do . What kind of a vehicle ? Ronnie

Yes, it's a 4x4 truck. A Ramcharger with a 6" lift kit. I have to use a double cardan on the rear because of the angle. The suggestion in the driveshaft world is to point the pinion up to transfercase, but the pinion ends up way high., the front bearing is then higher than the fill plug.
When you overfill these diffs, it floods the axle tubes, and the seals end up leaking prematurely. I changed the axle seals to the newer 2 piece seals, the same as on my 3500.ram, it has a sleave that seals to the axle tube that rotates in the seal, instead of the seal wearing down the axle tube seal surface,Dodge revised the fill level on later trucks to just below the fill plug, and it fixed the leaking.
I once found a paper written on double cardan joints that showed how to setup the angles
For a "broken w" angle, but I can't find it now.

My old Ramcharger had the double cardan in the rear as well. I had about 7" lift. I had the pinion about 3 degrees down from the pinion to transfer case line. The pinion ended up being 10 degrees up. As you mentioned, the fill was below the pinion bearing. The truck was off road only, but during long hill climbs, slower trail speeds, high torque with the 440 in low range, I didn't have pinion bearing problems. With road speeds, I would think there would be enough gear oil flying around to keep the pinion bearing happy.
If you still have concerns, you could get a fab cover and have the fill plug wherever you want it. Just a suggestion.

The lube flinging off the ring gear seems to get plenty up on the pinion even at low speeds.

https://www.youtube.com/watch?v=9-yG3D3JBRs