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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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