Page 127 of Buick Performance Parts Catalog by TA Performance

TRANSMISSION www.TAPERFORMANCE.com TA Performance Products, Inc. 480-922-6807 Order and Tech Line 127 Torque Converters Torque converters are an essential part of any combination using an automatic transmission, when the correct converter is selected, the driveability and performance desired is achievable. Production Buick engines obtained peak torque at relatively low RPM and in most applications used conservative rear gears for fuel economy. Anytime you go with a bigger camshaft you will be raising the RPM were peak torque occurs. With mild cams this will only be slight and a mild stall or stock converter will be ok. As you get into camshafts that are moderate (approx. 220 degrees duration .050 lift) and larger, a stall converter will be necessary. Mild stall converters can also improve the performance of stock engines, especially in heavier weight vehicles. The converter will get the engine closer to the peak torque quicker, thus quicker acceleration. Smaller stall converters of 2500 rpm and less, have similar driving characteristics to stock converters, but when full throttle is applied will flash higher. When you get into converters higher than 2500 they begin to slightly effect driveability, the main point being cruise speed, for instance a 3000 stall converter at light throttle may engage at 2000 rpm, so any rpm below that will slip the converter and create excessive heat. So with proper gearing a combination that requires a 3000 stall converter can be set up so that at cruising speed the engine will RPM higher than 2000. Stall ratings vary, based on engine torque, for example our 2500 stall converter will have a stall range of approximately 2300-2700 RPM, a mild 350 will stall on the low side and a high compression 455 will stall on the higher side. STREET ROD 20 SERIES This converter was designed and manufactured for the street rod enthusiast needing that slight edge over the stock converter. This unit has silicon brazing for strength, needle bearings for reliability and stator modifications for more torque multiplication. STREET MASTER 25 SERIES The Street converter was designed for the driver who is looking for that competitive advantage. By raising the stall RPM you can eliminate that slow, sluggish start. Recommended for stock to slightly modified engines to achieve performance, along with a smooth idle when the car is in gear. PRO-STREET 30 SERIES All pro street converters are brazed to increase strength and have full needle bearing design, front and rear to insure reliability. STREET STRIP 35 SERIES Excellent for racing or high performance street use. All 35 Series converters are brazed and feature a strengthened sprag, special cut stator, and full needle bearings front and rear. COMPETITION CONVERTER 40 SERIES The most important factor in drag racing is how your car leaves the line. This street and strip converter is exclusively designed for the serious racer. The replacement of the fiber thrust washers with heavy duty needle bearing packages, enables this converter to be run on the street, but is recommended for the strip. Part Nos. TA TC20 2000(nominal) stall converter, 12 , fits ST300, TH350, ST/TH400 ....................... $350.00 TA TC25 2500(nominal) stall converter, 11 , fits ST300, TH350, ST/TH400 ....................... $350.00 TA TC30 3000(nominal) stall converter, 10 , fits ST300, TH350, ST/TH400 ....................... $425.00 TA TC35 3500(nominal) stall converter, 10 , fits ST300, TH350, ST/TH400 ....................... $475.00 TA TC40 4000(nominal) stall converter, 10 , fits ST300, TH350, ST/TH400 ....................... $495.00 We recommend an auxiliary transmission cooler with any stall converter. Most GM converters have Chevy type mounting pads that are fairly large and can contact the counterweight on Buick Flexplates. Our converters use the small mounting pads to ensure proper clearance with the counterweight. NOTE: Converters listed above are Street/Strip Duty, they are not i n t e n d e d f o r Transbrake, Nitrous, S u p e r c h a r g e d o r T u r b o c h a r g e d applications. TA TC30 When installing the converter, push converter completely into the transmission, measure the distance from the base of the foot to the face of the flexplate. This measurement should be between .080 and .125 . If measurement is in excess of .125 acquire and install appropriate flat washers to obtain the necessary gap. Ensure that identical washers are used for each pad. Other installation considerations are required, please consult ALL included installation instructions. .080 .125

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