Be careful how low you get the oil in the rear. Last April I put a new gear in my truck and only put about 2 quarts of oil in it. The gear lasted 1 pass. The pinion bearing didn't get enough oil and locked up which broke the trans input shaft, busted the trans and ruined the driveshaft.
A $18 quart of oil cost me a transmission, driveshaft, 2-1350 u-joints
and a ring gear and $90 worth of gear oil. Probably close me about $2,000.
I think I was more ticked about the cost of the oil (2 quarts wasted on the first time and the 3 I had to use the second time.) than anything else.
Lesson well learned on that one

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Like already said use a piece of fuel line and I put a loop to it to make sure it doesn't overflow or get water down in it.