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Re: 85 Suburban TH400 to 4L80E swap
Engine RPM at 65 MPH with 235/85/16 tires with the TH400 was about 2700, with the 4L80E and the converter locked the RPM is about 1950. What a difference a .75 Overdrive and a Lock Up Torque Converter make.
Computer cable plug on side of transmission.
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