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Thread: Speedometer problem after converting to 4l80e

  1. #1
    Join Date
    Jul 2005
    Location
    Galesburg Il
    Posts
    87

    Speedometer problem after converting to 4l80e

    I destroyed the 4l60e.

    The local trans shop (very good technicians but not experienced in this conversion) installed a 4l80e from Coan trans.

    The speedometer registers at approximately 1/2 the actual speed... i.e. 30mph showing on the speedometer is actually 60 mph. I don't know how to correct this.
    2002 white Silverado ext cab. Taillights filled, roll pan w/93 Cad lights horizontally placed, tailgate handle inside, Gaylord tonneau, bed slide & bed rug, all trim removed, Escalade door handles, 18" Enkei & Falcons, Speed grill. Grill shell, bumper pad, & valance painted white. Mirrors painted white. Many interior pcs painted black (over beige), black leather seat inserts and sun visors. 2" dropped DJM lower control arm, shackles/hangers for 4" rear drop. Engine: 5.3 , Radix w 2.8" pulley, 90 mm throttle body, Dart 225 heads, Comp Cam 581-588 224-230 on 114. ARP head bolts. KTech rod bolts. Alky Control methanol injection, Pacesetter lt's into elec cutouts then 4" polished Magnaflow SS mufflers then 4" ovalized SS pipes exiting in front of rear wheels both sides, gas tank removed and 24 gal. fuel cell where spare tire was w/Aeromotive pump, pre and post filters and pump controller & -10 SS fuel line. 160 thermostat MSD wires & Perma Cool fan, 34" radiator, Meziere elec water pump. Valve covers, alternator & brackets powdercoated white. Built 4l60e, 4.56 with Detroit Locker Trutrack. 2 Interceptor logging guages, FAST dual 02 sensor wb gauge, Cyberdyne vac/boost gauge. Truck is actually the property of a little Benji type dog. Pics of him and the truck too www.swardphotos.shutterfly.com

  2. #2
    Join Date
    Dec 2007
    Location
    Ponca City
    Posts
    1,606
    Did you convert your wiring harness to accept 2 speed sensors? Assuming it had a 60e in it.
    Slowest in Oklahoma...

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