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

4+3 Question, Help Please

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Old Mar 7, 2015 | 03:38 PM
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Default 4+3 Question, Help Please

I have an 86 Z51 4+3, got the car for next to nothing so I figured I would redo it. Got it up on stands in the shop today and slid under it to check things out. Now I see my first problem, it appears maybe someone replaced the sideplate on the trans. I have reverse light switch, OD solenoid switch, and speed sensor......thats it, no 1st, 2nd or 4th gear switches. Now what do I do?
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Old Mar 7, 2015 | 04:21 PM
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a P/O probably tired of the oft-misunderstood logic and rewired it through the console switch.. solely! You don't need the other switches unless you wish to have it function as it did originally.
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Old Mar 7, 2015 | 05:40 PM
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The button on the shifter and lower switch were all missing so I purchased new ones. Hopefully it will work when I get it all replaced. Still scratching my head as to why the whole sideplate was replaced.
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Old Mar 7, 2015 | 06:56 PM
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Maybe the side cover had cracks where the shifter forks went thru? Or it may have had bad shifter forks and a PO simply decided to replace it as a unit? The 4-speed portion is a Borg-Warner Super T-10 and the side cover and forks on the 4+3 version should be interchangeable.

On my '87, there is a 1st Gear switch, but no 2nd or 4th gear switches. The Reverse switch is under the Reverse shifter shaft on the O/D housing as is the O/D solenoid harness connector.
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Old Mar 7, 2015 | 10:22 PM
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86 cars are unique and don't have any gear switches...1st and 4th gear ratios are detected by the ecm using n/v logic.
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Old Mar 8, 2015 | 02:16 PM
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TequilaBoy is correct. My '86 had no such switches, only reverse on the trans. The OD had an engagement connection and housed the speed sensor.
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Old Mar 9, 2015 | 10:56 AM
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Thanks for all the help!
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Old Mar 9, 2015 | 03:54 PM
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I couldn't find this the other day http://www.5speeds.com/43table.htm
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Old Mar 10, 2015 | 07:36 AM
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Thanks! That answers a ton of questions.
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