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Old 10-27-2008, 09:36 AM
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Muncie's Close Ratio vs Wide Ratio

What is the difference? which is better?
With 3:08-3:32 rear end gears would a guy want
close or wide ratio? What is you had 3:73'-4:11's
Thanks

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Old 10-27-2008, 01:45 PM
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Wide ratios are good for heavier vehicles or vehicles with a broader HP and TQ curve. All 4-speed muncie ratios end at 1:1, so close ratio means your first gear won't be as deep. That's fine in something like a big block Nova that is light and has tons of torque to spare. The wide ratio might be better in a heavy truck because it has a lower first gear to get things moving, as well as a broad torque curve to compensate for the larger RPM drop between gears.

Its a subtle distinction. I use the wide-ratio boxes a lot. They're still a lot closer ratio than, say a 700r4, they're cheaper, and most of my builds are heavy cars with mild street engines.

With 3.08s I'd lean toward the wide ratio to help get a lower first gear. With 4.10s, that implies you have a pretty hairy engine that needs those gears and I might go with the close ratio. Hairy engine often means "peakier" curves, so the close ratio will provide less RPM drop between gears and let you keep the engine in the "sweet spot."
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Old 10-27-2008, 01:45 PM
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I can only speak to the GM transmissions of the '60's.
The 1st 3 gears are lower in a wide ratio transmissions. 4th is the same: 1:1
As to which you would prefer, that would be largely determined by the intended usage.
For mostly street driving, a wide ratio would give you more acceleration in the lower gears, where 4th is just for cruising.
For racing, a close ratio would give approx the same RPM drop between gears, and you would choose the rear end ratio that best fits you vehicle and the length of the drag strip or race track.
JA
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Old 10-27-2008, 02:00 PM
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Muncie Wide vs Close Thanks

Thanks for the knowledge. I will have a 396 with some HP/Torq.
It is in a 65 Chevelle. Right now it has 3:08's. So this close ratio
M21 is a poor choice until I get 3:73 or more, right? I should be looking
for a wide ration M20 or M21.
Darn
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Old 10-27-2008, 10:03 PM
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Quote:
Originally Posted by Fastest65
Thanks for the knowledge. I will have a 396 with some HP/Torq.
It is in a 65 Chevelle. Right now it has 3:08's. So this close ratio
M21 is a poor choice until I get 3:73 or more, right? I should be looking
for a wide ration M20 or M21.
Darn

2:20 (close ratio) and 2:52 are the 1st gear on the M. Multiply the 1st gear by your rear ratio and you can compare the launch potential of each.
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Old 10-27-2008, 11:43 PM
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With 3.08-3.32 gears, I wouldn't want either one. Not enough total gear reduction for decent driveability OR a good launch, depending on what you intend to do with the car.

Multiply low gear ratio times rear axle ratio. If you get less than 9, assuming tires ~26" in diameter, driveability will suffer, and "launchability" will suffer even more.
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