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**TJ's Chevy** · 06-25-2016, 11:14 PM

You have the SM420. Bullet proof and NOT a racing trans. Wide ratio gearing and a long throw makes for slow shifting. But they are a darn good tranny. I'd keep it.

06-25-2016, 11:14 PM	#2
TJ's Chevy Post Whore Join Date: Mar 2013 Location: Southern Oregon Posts: 10,403	Re: 1966 original Chevrolet 4 Speed You have the SM420. Bullet proof and NOT a racing trans. Wide ratio gearing and a long throw makes for slow shifting. But they are a darn good tranny. I'd keep it. __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw