C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

4+3 shifting. Normal?

Old May 20, 2007 | 04:43 PM
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Default 4+3 shifting. Normal?

85 4+3 won't go into overdrive until it warms up (1-2 miles highway speed). Otherwise works perfectly. Is this normal? If not, what could be causing it? Thanks
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Old May 20, 2007 | 05:02 PM
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http://www.5speeds.com/43table.htm

1985 model needs to get to 140* before OD will operate.
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Old May 20, 2007 | 05:58 PM
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Thanks for sharing that link. I had no idea....
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Old May 20, 2007 | 07:12 PM
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Thanks for the info, SCORP.

Last edited by pmihaltian; May 21, 2007 at 12:15 PM. Reason: clarity
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Old May 20, 2007 | 07:38 PM
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i think my 86 needs to get to 120 then it automatically go into overdrive
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Old May 20, 2007 | 07:44 PM
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Originally Posted by bill83c4
i think my 86 needs to get to 120 then it automatically go into overdrive
122*, same as my '87.
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Old May 20, 2007 | 08:32 PM
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That chart covers it. Thanks much.
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