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TCI Stall Speed Ratings

This chart from TCI shows stall speed ratings for its converters based on camshaft and rear-axle gear ratios. While the chart is based on TCI's series of converters, the specifications are good general guidelines for those types of converters regardless of manufacturer.

(Chart courtesy of TCI)

TCI  Torque
Converter Series
Adv. Camshaft
Rear Gear
Stall Speeds
        Small Block Big Block
Sizzler Stock to 260 degrees Stock to 3.23 Smooth Idle 1,500 to 1,700 1,000 to 1,900
Saturday Night Special Stock to 265 degrees Stock to 3.23 Smooth Idle
stock comp. ratio
1,600 to 1,800 1,800 to 2,000
Breakaway 265 degrees to 280 degrees 3.00 to 3.73 Fair Idle
mild modification
2,400 to 2,600 2,600 to 2,800
Streetfighter 280 degrees to 300 degrees 3.55 to 4.56 Rough Idle large fuel system raised comp. ratio 3,000 to 3,500 3,400 to 3,800
Super Streetfighter 280 degrees to 310 degrees 3.73 to 4.88 Rough Idle large fuel system raised comp. ratio top end power 3,500 to 4,000 3,800 to 4,200

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