I have a custom shaft that is 1/2" too long. By that I mean it is a bear to get in, but does not bind once installed. No, I am not sure its not the muffler, but I never had any buzzing before the tranny swap.

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For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel