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Old Aug 9, 2017 | 03:44 PM
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Marion1946's Avatar
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Default Overdrive

I have 1987 corvette that will not go into overdrive it was stored about 4 years any ideas? It's a 700R4 automatic

Last edited by Marion1946; Aug 10, 2017 at 09:47 AM. Reason: Add more info
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Old Aug 9, 2017 | 10:24 PM
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See if the OD unit has any oil (ATF) in it.
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Old Aug 10, 2017 | 04:29 AM
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Mine had the problem that it wouldn't work by using the switch but would work off the accelerator.
This led me to look at the micro-switch at the base of the gear shift. Replaced it for 14 bucks and now it works perfectly.
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Old Aug 11, 2017 | 01:31 AM
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It might be working without you knowing it. Put the shifter in D and run up to about 50 MPH. Then put the shifter in OD. If it shifts then OD is OK. If it doesn't shift then you need to have a trans shop look at it.
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