How does a person with 4.56's and an AOD end up with a calibrated speedo?
I'm trying to set up for my 4.56 install to give my AOD that real pep it needs. Apparently, the calculators tell me I need a 28 tooth or something like that! I'm running 225/60/16's and currently I have a 21 tooth driven gear with my 3.73's (I think that means I have the 8 tooth inside). Now, I've seen 23 toothers out there but thats about it.
What can I possibly do? I know they have electronic correction devices but it seems like overkill. I also know that the drive gear is part of the output shaft. Does ford make recalibrated speedo innards? I want to keep the stock speedo gauge.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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