( TCI-254002 ) - Torque Converter-GM 350/400 THM -Turbo splined 8 inch Group 1 series Small bolt pattern Average stall speed is 4500-5000rpm Good for light and heavy vehicles 2500-3200lbs, low-rpm, high torque, big block... Brackets: 10.90, 9.90, 8.90 E.T. Recommended for 427-482c.i. 4.88 to 5.27 gear ratio 30 to 32inch tire 750 to 1050cfm carb 6000 to 7000 engine RPM range Cast steel stator supported by an oversize caged bearing for added reliability features an improved housing design for less flex or "ballooning" under the stress of racing, resulting in more consistent elapsed times, faster reaction times and better durability