Hank is correct.The late model vehicles can use a loose converter. The lockup feature takes up for the stall in the higher gears. It must be noted that these vehicles are "computer" controlled, with the ECM controlling shift points and torque converter clutch lockup. Makes 'em a little more versatile.
If you can control the shift points and the lockup point, a looser converter WILL work. Perhaps modifying the governor could change the shift points further, allowing the converter clutch to engage in the lower gears or at lower RPM. That and some fiddling with the TV cab;e could make a higher stall converter more usable. There isn't any electronic control on the 700R4.
In my application, a completely stock 700R4 behind a 153" Chevy four cylinder, also stock, the pickup converter is plenty loose for idle and low speeds and tight enough to deliver excellent traffic manners and good fuel mileage. Idle speed is around 750 RPM and it drives well. I should add that my induction is a hand fabricated tubular intake with a Holley NASCAR 400 cfm double pumper carburetor with mechanical secondaries. The ONLY modification to the transmission was careful, gradual adjustment of the TV cable.
Last edited by Blackwater; 08/16/21 06:23 PM.
