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Muncie in a jeep??

Discussion in 'Flat Fender Tech' started by SimplyMe, Apr 13, 2009.

  1. Apr 13, 2009
    SimplyMe

    SimplyMe New Member

    Joined:
    Apr 11, 2009
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    2
    I just bought a 47 Willys CJ and it has a Buick 231, odd fire engine with a Muncie M21 adapted to a T18. My question is.... Why would you use a Muncie? I thought that the Muncies were used in race cars? Because they are high geared. Has anyone ran into this before?

    I parted this Jeep out because it was in bad shape and I was not sure if the engine ran. If you would like to look at this set up. Click the link

    http://stlouis.craigslist.org/pts/1119213197.html
     
    SimplyMe, Apr 13, 2009
    #1
  2. Apr 13, 2009
    cj6/442

    cj6/442 Sponsor

    Fallbrook, Calif
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    when I bought my jeep it had a car Muncie 4 spd in it . it shifted just like my olds ,and was very high geared, it sucked for anykind of crawl ratio, the pocket bearing took a dump and froze 40miles away from my house in 4th. that was a fun trip home. I pulled it for a T-18 instead ,,,,,, and used the muncie spare parts for my car.
     
    Last edited: Apr 14, 2009
    cj6/442, Apr 13, 2009
    #2
  3. Apr 13, 2009
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Don't confuse a D18 transfer case with a T18 transmission. What you have is definitely a car Muncie M-21 mated to a Dana 18 transfer case, and yes the crawl ratio will suffer offroad with this setup. Dana transfer case models are all referred to as a D-something while transmissions are referred to as a T-something. (general rule of thumb)

    Back in the day the Muncie swaps were common in Jeeps for some reason, but never with serious off-roaders. I'm betting that an SM-420 would prolly drop right in there though since you're already set up for a Muncie...
     
    w3srl, Apr 13, 2009
    #3
  4. Apr 13, 2009
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    You mean like this:
    [​IMG]

    It was a fairly common swap years ago, mostly for racing. I have seen them in sand and ice race riggs.

    High HP - Lots of wheel spin - keep the momentum running.
     
    Warloch, Apr 13, 2009
    #4
  5. Apr 14, 2009
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Good for the dunes. That's a form of serious offroading. :driving:
     
    timgr, Apr 14, 2009
    #5
  6. Apr 14, 2009
    jeeper50

    jeeper50 jeeps 'till I die

    Spanish Fort. AL
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    AA offered many different kits back in the old days for us to upgrade the non syncroed T90 trans to a more modern trans. I used one of their kits to install a Mustang 10 bolt top loader behind a 302 into a Willys wagon for sand drags and general driving around town. It was before the phrase " crawl ratio" was using in the jeep world. I raced alot of flatties with muncies and 350s on the sand.
     
    jeeper50, Apr 14, 2009
    #6
  7. Apr 14, 2009
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    I stand both bloodied and bowed sir. :oops:
     
    w3srl, Apr 14, 2009
    #7
  8. Apr 15, 2009
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Absolutely correct. I had a BW super T-10 in the race Jeep for this reason.
    Nice Saginaw there Warloch.
     
    nickmil, Apr 15, 2009
    #8
  9. Apr 15, 2009
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Thanks Nick - Hurst shift kit - D18 w/OD ....

    Ran real nice when it was in.
     
    Warloch, Apr 15, 2009
    #9
  10. Apr 15, 2009
    SimplyMe

    SimplyMe New Member

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    Thanks for the info. on all this Jeep stuff. I am a Blazer guy myself. I just found this 47 Jeep in a guys back yard and thought I would make a few bucks off of it.
     
    SimplyMe, Apr 15, 2009
    #10
  11. Apr 16, 2009
    m38@4130

    m38@4130 New Member

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    Sep 19, 2008
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    I am very sure you will like a Muncie 420 behind your 231. have a similar set up in my cj6: a 225 engine with BOP bellhousing going to a Muncie 420 followed by an Advanced Adapter adapter into a Dana 18 with an overdrive on that... fun around town car and does great in the rocks with the 7:1 ratio first gear
     
    m38@4130, Apr 16, 2009
    #11
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