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Thread: 1986 C4 transmission swap

  1. #1
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    Default 1986 C4 transmission swap

    Hey im thinking about buying a 1986 corvette. It has the doug nash 4+3 which is shot it goes into gears very hard. I was doing some research on converting it to a 6 speed andit seems like it would be pretty expensive to do it right so i was wondering if it would be easier to just put a regular 4 speed manual in it. What transmission would be the best and how involved would it be?

  2. #2
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    C3 -78, C4 -86

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    Why not get a complete working second hand 4+3 unit to retain the overdrive?

    AFAIK if you remove the overdrive unit you will need longer driveshaft and end up with high revs on freeway. A TKO or equivalent 5 speed is on my list when the 4+3 someday gives up - even then probably needs driveshaft fiddling.

  3. #3
    Mac
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    yellow 1973 coupe L82 4 spd with no power options

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    I'm not a C4 kinda guy so I can't help you with the technicals but I can say WELCOME to you both!

    -Mac
    Common sense is like deodorant. The folks who need it most never seem to use it and there's no polite way to tell them.



  4. #4
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    Thanks Mac.
    Mac likes this.

  5. #5
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    Corvette(s)
    87 z-51

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    Quote Originally Posted by C4corvette View Post
    Hey im thinking about buying a 1986 corvette. It has the doug nash 4+3 which is shot it goes into gears very hard. I was doing some research on converting it to a 6 speed andit seems like it would be pretty expensive to do it right so i was wondering if it would be easier to just put a regular 4 speed manual in it. What transmission would be the best and how involved would it be?

    Thats as much a clutch problem as it is a worn tranny.

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