New P/S Pump -- Leaking!

['68OrangeSunshine]

I put on a new power steering pump on my '71 Jimmy [4WD,350, sm465,np205] last Thursday and now it's losing a lot of fluid.
I had the Gear Box R&R'd about a month ago at a shop in Tucson [home]. The old pump was working OK so we left it on. Then last Tuesday, after a freeway run up to Mesa [95 miles~] I heard this repeated knocking under the hood. I thought it was the flex fan hitting the radiator shroud, but the big problem was excessive wobbling the pulley on the P/S Pump. I pulled the old pump and after getting the pulley off, I saw the woodruff key in the pump shaft had been enlarged by successive vibrations so that the key slot was twice its normal size.
So I got a rebuilt pump from Checker Auto with a warranty. Install was a PIA but I got it all back together. It leaked from the start. I found one of the hose clamps on the Lo-pressure return line was busted so I used a new one. It still leaked. In fact, it seems to leak worse each day. Since I was on an out-of-town run, I kept topping off fluid. I'll have the shop look at it tomorrow -- since they need to adjust the front brakes anyway.
I had a problem with the 2 studs that stick out the back of the pump -- ~3/8-20 studs on a 5/8 hex in the middle. Had to use a vice and a ball pien and a 3/4 drive ratchet to ding them off. Finally they came loose. On reassembly, I leaned into the last turn, but had no torque wrench. Was I 'spose to use thread sealer or loctite on those applications? There were no O-rings with the new pump or visible on the old. The lower stud seems to be a focus point for PSF to collect before forming a drop big enough to splash in your eye. Could it be my leak?
I always use Pyroil [Valvoline] Power Steering Fluid. Its clear, so is Prestone PSF. After the shop put on the P/S Gearbox and draglink and alignment, last month, the fluid was red, like ATF. If you mix ATF and PSF, do you get a problem -- like mixing Dextron/Mercon and Type "F" that blows seals in automatic trannies?

Or did I just get a defective "Lifetime" rebuild from Checker Auto again?