I have been working on fixing my humming after my 4-speed conversion on my 300cd. I read before that lowering the rear mount on the trans has fixed it. My question is how much did you have to lower it to fix the problem.

I have lowered about 3/4 inch so far. It has gotten better, but not completely fixed yet.

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior