The Overdrive Option - Dispelling the Rumors, Myths
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Most auto trans manufacturers make a version of the TH700-R4 overdrive automatic (shown here is the T700 tranny from Jet Performance), as it’s a popular swap. The 700-R4 is similar in size to the TH350, plus it isn’t electronically controlled (except for its lockup torque converter), so it’s easier to install in a non-computerized car. It also offers a wide range of gears, from a deep 3.06:1 First to a 0.70 overdrive. Weak early-production (pre-’88) models tarnished the 700-R4’s reputation and should still be avoided if you’re buying a salvage-yard tranny. The Jet T700 features over 40 modifications from the standard 700-R4 to eliminate those weak components, and it can handle up to 450 lb-ft of torque. View Related Article
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