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Old 01-07-2010, 10:57 PM
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Stall vs. gear ratio

I have a 66 Chevelle with a 383ci. My 60 ft is 1.6; 11.3 quarter at 120 mph. I have a 3200 stall converter; built-up TH350 and Fab9 rear with 4.11 gears.

WHat should I do in regards to better my E.T. times/trap speed? Option 1) change to 4,000 stall to use with transbrake or 2) change 4.11 gears to 4.56 or more and transbrake?

Thanks!

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Old 01-07-2010, 11:04 PM
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What is your rear tire size.
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Old 01-07-2010, 11:06 PM
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Change to a 4500-5000 stall would do wonders, probably a good 4 tenths there, maybe more.

Trans break won't likely make the car any faster, just quicker reaction times and better consistancy.

What is the rpm at the finish line now and how high are you willing to go?? What diameter is the rear tire?? These will determine the correct gear ratio.
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Old 01-07-2010, 11:17 PM
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I am using Mickey Thompson E.T. Radial: P275/60R15. I believe the height is 28 inches.
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Old 01-08-2010, 08:42 AM
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Hope you have a rev limiter and shift light. The RPM's are going to climb real quick with the 4:56's.
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Old 01-08-2010, 04:04 PM
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math shows you just hitting 6000 rpm at finish line with current set up. is this correct??

How high is you engine redline rpm??
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Old 01-10-2010, 02:07 PM
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Both converter and gears need to be addressed. But remember any advise you receive here is based on info supplied, and you haven't supplied much. Tell me something about the engine i.e. cam, heads, carberation, and what kind of abuse it will stand.
Let's say it has good parts and will handle 7200 rpm top end, then your converter is way to tight. A 4500-5000 would do wonders. Would put you in the 10's easy if the tires and suspension work.
The 4.11 gears are something else. If your car is around stock weight you could go with some 4.56's. The 4.56's will help ET but may hurt MPH a little bit.
Both of these changes will dramatically affect your performance on the track, and will probably necessitate other changes so make one change at a time. I would change the converter first... If you send me a PM I can help you in that arena. Sarge
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