1990 chev van speedometer

1988 CHEVROLET VAN
2WD • AUTOMATIC
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1990DUTCHVAN
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I've replaced a 3:52 rear end with a 4:11. What do I need to do to get the speedometer to read the correct MPH? Van has a 5.7 with AT.
Feb 1, 2011 at 2:38 AM
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HMAC300
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good luck on this one, the pcm has to be reprogrammed for the rear end and i'm not sure they will go for that particular rear end. You'll have to contact a dealer and talk to their guy that does the reprogramming. It may not be capable of doing this.
Feb 8, 2011 at 1:53 AM
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