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Re: Need some input on noise
It sounds like a noisy bearing or a one of the syncros and/or gears are a little loose. There are always decisions made during a rebuild as to what parts are reusable. It could be that one of the reused parts are just slightly out of tolerance and making the noise. I'm not familiar with a m20 Is it a car transmission or do you mean SM420? If it is a truck transmission then talk to the folks at Novac. They have always be good to me plus their web site is chock full of good info.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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