I've got a 91 Camaro RS with a 305 TBI and I've recently put a T56 out of a 93 Camaro,I also put a set of Richmond 3:73 gears. I'm having problms recalibrating the speedomiter. Is there a way to fix this or do I need a aftermarket gage.

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91 Camaro RS with a T56, 3:73 rear, subframe connectors, 3" flowmasters, underdrive pullies, urathane bushings, torque arm

 

Cyberdyne, that makes digital gauges has a speedometer recalibration box. I'm using one in my '91 RS to correct for 4.86 gears, but I can't find the part number. There are two available. One is for a Cyberdyne speedometer and is about $30-35. The other is for OEM speedo and sensor. You need the OEM (of course, the more expensive one). It is about $70-75. You wire it into your VSS and adjust it with a screwdriver until your speedo reads correctly. I bought mine from Jeg's.

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91 Camaro RS
Too many mods to list here
http://www.quick91rs.cz28.com