• Basic Function of a Torque Converter.
• Diesel Power Pullers.
• Racing Applications
• Recreational Vehicle Applications
• Heavy Duty Converters

DUNRITE POWER PULLERS:

Torque converters used for towing heavy loads are designed differently than those for RV use and are usually used behind big cubic inch engines and/or diesels.
Dunrite "Power Puller"T torque converters tend to be slightly lower stall with tremendous pulling ability and are built stronger inside to withstand higher temperatures and greater input torque.

If a torque converter has a lockup clutch, it generates tremendous heat to the friction clutch during lockup under a hard pull. This is the area that generally fails first. The resulting contamination of burnt friction material and metal particles end up in the transmission causing valves to stick and early trans failure.

Just because the stall is lowered in a torque converter doesn't mean it is producing more torque (twisting force). This has been proven in our facility by comparing test after test using the same vehicle with numerous changes made to the torque converter. (See graphs under torque converters). The torque curve changes dramatically whenever the stall ratio is altered.

When considering a Dunrite "Power Puller" torque converter, one must consider what the maximum combined gross vehicle weight will be, and what engine modifications have been made. Approximate torque, and horsepower is necessary in order to match the engine to the torque converter. This information is necessary to establish the correct stall ratio for the vehicle. Once this is established, the converter is designed to hydraulically reduce the impeller to turbine speed differential as close to one to one as possible without sacrificing power loss before the converter lockup clutch is engaged. By reducing the speed differential between the impeller and the turbine at the time of converter clutch lockup, we reduce glazing and overheating of the friction material which is what causes premature lockup and transmission failure.  Heat is reduced and the durability of the torque converter is extended to match the rest of the power train.