Transmissions and Drivetrain Need help with your trans? Problems with your axle?

1/4 mile and TC ?

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Old Jan 18, 2009 | 11:42 AM
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RedHawkLB9's Avatar
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Car: 89 Formy
Engine: carbed 355ci
Transmission: A4
Axle/Gears: 3.73 10 Bolt
1/4 mile and TC ?

hi, will rpms be higher at the finish line(becouse of the inefficent slip) with lets say a 2500k stall in a 89 ws6 700r4 tpi car?
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Old Jan 18, 2009 | 12:02 PM
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AlkyIROC's Avatar
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: 1/4 mile and TC ?

Stall speed is the speed in which the impeller and the turbine are turning at the same speed. They'll never be 100% at the same speed and that's how much slip is calculated. Anything less than 10% is considered good.

A 2500 stall converter will still drive around at low rpms at part throttle however because it's not under the stall speed, it will generate a lot of heat in the oil. At WOT, the engine will quickly climb to the stall speed and won't drop below it even after shifting gears until you let off the throttle. This keeps the engine in it's powerband where it will makes the most power.

Converter stall speed needs to be matched to the camshaft. Gears, tires etc need to be matched to the stall speed.
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