The gears will whine some, nature of the beast. The popping is very likely one of the big ball bearings on the diff shafts, the ones that pass out through the side of the tranny to the final drives. And it is the seal around that shaft that is leaking. If you're lucky, the popping will be on the same side as the leak. There are also large bearings and seals at the tops of the final drives around the diff shafts and another pair at the bottom around the actual axles. Removal of the diff shaft on the left of an A is much simpler than on the right, but either makes a good project. The mauals give the order of work and you can find some good threads on it here in the archives.
Also, on the popping, don't rule out a loose wheel bolt. That can get pretty noisy, too, but is usually but not always in both directions.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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