doesn't shift out of low till 45 mph

1990 CHEVROLET CORSICA
16,000 MILES
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LAKE
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Hi GuysI have a 91 Chevy Corsica with an automatic trans. Now, I was leaking fluid and it got very low so I replaced the gasket and filled it up. The problem now is that it doesn't shift out of low till 45 mph and then into high at 65. Also there's a switch that I don't what it does? The engine runs well. It just doesn't shift properly.

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Feb 9, 2012 at 2:24 PM
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MERLIN2021
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It can depend where and how fast the leak is, these work by fluid pressure so low pressure means low performance.
Feb 9, 2012 at 3:57 PM
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