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05-21-2003, 06:13 PM
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Speedometer Calibration
Question on a 1991 Camaro with a 4L60 Trans if you change the rear gears to 3.73 What procedure do you follow to recalibrate the speedometer.
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05-22-2003, 05:44 PM
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http://www.tciauto.com/tech_info/speedo_gears.htm
This is what I used to get mine back in correct working order.
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05-22-2003, 05:54 PM
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 Some of the late model GM transmissions have a electric speedometer drive. My 90 Silverado did.  When I changed the rear end ratio.....the speedometer was OFF. It had a chip with 5-6 legs off each side. I found a chart that told (GM service manual) which leg up and which leg down was the correct configuration for the gear I had installed. I believe the 91 Camaro was that way also. 3.73 is a factory offered gear SO I know it is a simple matter to correct .
__________________
"I won't be wronged . I won't be insulted, and I won't be laid a hand on. "
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05-23-2003, 09:54 AM
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Thanks "Doublevision" #5093 for the speedo cable charts ,I'll savethose for future reference.However this model uses a reluctor (toothed rotor) and an electromagnet speed sensor. Also Thanks "Deuseroadster" #3897 I have a 1991 Siverado GM manual and I found the push/pull set up. My buddy with the Camaro Says he can't find it next to his ECM and the Dealer said they couldn't help him.What I would need to know is what the Camaro Manual says. Thanks.
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