OK, I've discovered the problem. On the diff pulleys, there is some flashing on the inside of the of the sides of the pulleys. When the belt is trying to enter the pulley, it is getting caught on the flashing, causing the 'growling' sound. I've tried to trim the flashing and make it as smooth as possible, but the belt is still getting caught on a couple of section of the pulleys. This is annoying to say the least.
I will try running the transmission in on the bench and hope the problem goes away.
I suspect my kit is an old one and don't think it has the newer machined pulleys (the ones I have are black). Will the new machined pulleys solve the problem? Do XXX4 pulleys fit? I seem to recall no such problems when I ran the XXX4 some years ago.
Cheers,
Scotty P.
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