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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I havea 2000 Chevy C6500 7.4 gas. auto transmission.

Customer Question

I havea 2000 Chevy C6500 7.4 gas. auto transmission.When cold starts, it starts fine idles fine. but when running down the road I have no speedometer reading and truck will not shift into drive until truck water temp warms up to around 200. That is when speedometer works and truck shifts fine the rest of the day or until it sits long enough to cool off. ??
Submitted: 6 years ago.
Category: Chevy
Expert:  Doug replied 6 years ago.

Doug :

Thank you for choosing just answer.com,I look forward to helping you,Doug Castillo, Do you have a volt/ohm / meter, a way to jack up rear end and put support stands under axle,to do a test, Doug

Doug :

what we need to do is test your speed sensor at transmission , please do not press accept until you are satisfied with my answers , Doug