Muncie 4-speed or 5-speed Conversion?

Discussion in 'Transmission & Driveline Topics' started by Billy73, Aug 2, 2019.

  1. Billy73

    Billy73 New Member

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    I have a 1973 Camaro Z28 with a 383 stroker and the original Muncie 4-speed manual. I sure would like a 5-speed for daily driving. Can I get some opinions about this? For those of you who suggest converting to a 5-speed, what transmission do you recommend? Thanks!!
     
  2. dave@ztech

    dave@ztech Veteran Member Lifetime Gold Member

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    I am also looking for a strait swap 4 to 5 , I don't think it exists , hopeful
     
  3. Billy73

    Billy73 New Member

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    I thought tremix or somebody made a kit that will work so long as you already have a manual transmission to start with - not trying to change from an automatic.
     
  4. 70lt1z28

    70lt1z28 Veteran Member Gold Member

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  5. Billy73

    Billy73 New Member

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    Thanks! Not exactly plug and play...
     
  6. tom3

    tom3 Veteran Member

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    Depends some on how your car is built now. The overdrive 5th gear is best with a motor that has some low/mid range torque. A high revving cammed up big carbed engine probably won't match up too well with the Tremec.
     
  7. Zspoiler

    Zspoiler Veteran Member

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    It also depends on how deep your pockets are.
     
  8. Green hornet

    Green hornet Veteran Member

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    It usually does lol
     
  9. G72Zed

    G72Zed Veteran Member

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    In your particular case, I would perhaps give the Richmond S/S 5spd a close look. Very close to the '71-'74 Muncie in dimensions and gives you a lower first gear, and the .77 OD your looking for. Looking at it closely, with a bit of work, you could use mostly all of your existing 4spd Muncie stuff, even the cross member and perhaps the driveshaft.

    I will assume you still have the 3.73 rear and are carbed, if so, and your using a tire of approx. 26.5 inches tall, you will go from 63 mph @ 3000rpm to 69mph @ 2,500 rpm with this trans.

    Absolutely good point, it really depends on rear gearing, trans OD and tire dia. combonation used and a proper tune of course.

    I use an OD 5spd (.77) with a 333 sbc, big cam (262 @ 50) and carb (870) combo and works out great.
     
  10. grzewnicki

    grzewnicki Veteran Member Lifetime Gold Member

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    transmission first gear times rear gear should be around 10:1 so TKO500 with 3.27 first gear times a 3.73 rear ratio gives you 12.19, you will go through first gear quickly....don't ask how I know this. I swapped down to 3.42 rear gear set but really should have gone down to 3.23. Do your homework. I was ignorant on this and paid the price having to change rear gears. If I had gone with the TKO600 I would have been right around 10:1. Live and learn.
     

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