Gear lube compatability/axle capacity.

I'm putting 75w90 Mobil 1 in the 30/35 axles in my jeep, and I only bought 3 quarts. Will that be enough for both axles, with 1.5 in each? I know the capacity for the dana 30 is 1.5 qts, but what about the 35? And if not, can I top it off with some 80w90 non-synthetic, because I really really don't want to spend another $10 on some gear oil I'm only going to half-use.

On my 99, the rear 8.25 took about 2 quarts.
The front one took about 1.5 quarts.

Well I put 1.5 Quarts in each and both started running out of the hole, so I think i'm good.