The motor armature runs on bronze bushings , surrounded by a oil soaked felt.
Removing and changing the position of the motor from it's normal run position, may have allowed some of the oil left in the felt to soak into the bronze bushing and quieting the noise.
You can carefully drill the outer part of the housing and re-soak the felt .
BY CAREFULLY ; I mean , allowing the drill bit to hook the felt can ball up the felt and render it useless.
I've done this on 3 of my 5 RVs as the furnace ages , with good results.
Mark the motor so your drilling from the top , soak with a few drops of oil and wait before applying more drops , 6 times in 48 hours worked for me. Plug the drilled hole with silicone sealant and reinstall the motor.
Alternative is a new motor .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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