Speedo gear huh? that sucks  I never worked on the tranny you have but I am currently putting off a tailshaft swap that I need to do on a 4l60E that I have the E uses an electric reluctor wheel to read speed using 40 impulse per revolution. problem is I needed a 4l60 non electronic that uses a Plastic speedo gear set that gives me 4 sparks per rev so what happens is the computer in the car shoots the sppedometer to 120mph when you are driving 5mph and the convertor is on full lockup no stall.. your odometer goes about a tenth of a mile per foot moved ....
I feel your pain with this replacement ... Computers are such a pain good luck on the fix looking forward to hearing how it comes out.
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*
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