I'm considering replacing my M21 with a Tremec 5-speed. I've read many previous posts on the subject, but would like some input on the spread between 1st and 2nd, and 2nd and 3rd. The reason for my question is that I intend to rebuild my differential while I've got everything apart, and would consider replacing the 3.36 gearset to something like a 3.73. It's an L-79 and a bit of a dog taking off with the close ratio 4-speed. As I recall you couldn't order an L-79 with a 3.36 and an M21. Can anyone offer some real-world experience driving a TKO-600 with either of the gear ratios mentioned?
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Re: 5-Speed in a C2
Consider a Richmond Super T-10 Wide Ratio - 2.64, 1.75, 1.34, 1.00:1. You can compute the gear spreads. It should be a pure bolt-in, and there's no need to change the ring and pinion.
First gear is 17 percent shorter that a vintage CR, and the big gap is between first and second, (which you will hardly feel) instead of third and fourth, which makes the car fall on it's face when you shift to fourth with the OE wide ratio.
Do a gear chart.
www.richmondgear.com
Duke -
Re: 5-Speed in a C2
Thanks Duke. Not that I intend to go racing, but the current L-79 will eventually be replaced with a 383 with much more torque. The Richmond web site says the Super T-10 is rated at 325 ft lbs. I assume that unless I do repeated sledge hammer starts the T-10 will live just fine. Gear ratios aside, in general do you have a preference between a Muncie and a Richmond?Comment
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Re: 5-Speed in a C2
I prefer the Super T-10 gearing. Ratio spacing should narrow as you go up through the gears, which is how the Super T-10 is set up.
DukeComment
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Re: 5-Speed in a C2
If you have the 66 and later Muncie with the 1" cluster pin, another option is a new gear set from AutoGear. You can even get wide-ratio M22 gears, for about $660.00. These are Italian made, and supposedly bulletproof. The various ratio options are listed in this article:
Here is their website:
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