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Old 09-23-2009, 08:57 PM
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3 or 4 Speed for mildly built 307?

Alright guys here it goes- I found a couple of cheap transmissions that I was hoping would work with my 307 motor im building up. One is a 3 spd. manual out of a 1978 GMC van and the other is a 4 spd. manual out of a 1983 4 cyl camaro. The guys has the bellhousing for the 3spd to fit a small block chevy and the bellhousing for the 4 cyl. Both are $50, which is about as much as I was willing to spend for this project of mine. One of the questions I have are am I better off going with the 4 spd. for the sake of, well, having a 4 spd? Or would I be better off going with the 3 spd. because it has the bellhousing that would fit my motor? I hope to have this 307 and whatever tranny i choose in some kind of chevy car, whether it be a nova or a camaro. The motor itself will be fairly built with an aggressive cam, intake and some really good 305 heads. Which tranny would be better for putting the power down and drivability in my project?

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Old 09-30-2009, 12:16 AM
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Any idea what kind of 4-speed it is? If it's a Saginaw or Borg-Warner with a 1:1 4th gear, I'd check and see if it will fit on the SBC bellhousing. A 4-speed beats a 3-speed in any application I can think of. Using a 3-speed will give you good acceleration through 1st and 2nd, then it'll fall flat on its face when you hit 3rd. A traditional 4-speed is similar to the 3-speed in 1st and 2nd, and 4th is 1:1, same as 3rd in the 3-speed. The 4-speed has a gear between 2nd and high, which prevents the face-falling after 2nd gear is wound out.
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Old 09-30-2009, 07:22 AM
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I agree with Jim, if it fits the 4 speed is the way to go.

Vince
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Old 09-30-2009, 03:43 PM
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Yeah the 4 speed definatley looked like a saginaw, but the guy who posted the ad didn't specify it. It probably needed a rebuild being as it was only $50, but its sold so i guess I will never know!
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Old 09-30-2009, 03:45 PM
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4-Speed ..............Cole
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Old 09-30-2009, 05:48 PM
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Go with 4 spd , one of my good friend was having a 3 spd in his camaro and he hate the the car because that transmission Me I was driving a borg warner super t-10 on my 77 firebird the car was just so nice to drive with that transmission and she was verry tough I tested them But now I m swapping a t-56 spend more money but go with 4 spd
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