Your assembler made a major mistake somewhere when the new ring and pinion was installed. The pinion bearing assembly should have been retained at the correct depth in the ring gear by the three setscrews in the torque tube/carrier housing. There's a definite possibility that the new gears have been damaged as well as the spider gear carrier. Those spiral scars can be smoothed out with a sanding disc on an angle grinder, but the whole assembly is going to have to come out and be disassembled and inspected for damage to the gears. Good luck!

Edit: When I enlarge the picture I can see some chips and scars on the ring gear teeth. If the ring and pinion isn't totally trashed, the rearend will probably have a whine even if the gears are reinstalled correctly.
Jerry

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