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What V6 Is This?

Discussion in 'Early CJ5 and CJ6 Tech' started by FinoCJ, Jun 5, 2021.

  1. Jun 5, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    You guys never cease to amaze me with how you identify engines from a couple bad pics...so without the entire story, I was contact by a local guy who somewhat recently bought a rough and very un-original 1971cj5 Ren II - or something like that. It has some sort later v6 engine and auto TH350 transmission. He did some damage to engine, and needs some parts and is having trouble getting the right stuff - possibly because he doesn't really know what engine it is. His research and block numbers suggest its a Buick 3.8...it kind of looks like one as well with a R2g carb, but seems some of the parts he bought don't fit or are not replacements of what came out. And the oil pan is weird ....maybe its from a front wheel drive application? obviously the oil pan is in conflict with D18 front output, so it doesn't have a front driveshaft. What do you all think it is?
    [​IMG]
    [​IMG]
    [​IMG]
     
    FinoCJ, Jun 5, 2021
    #1
  2. Jun 5, 2021
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Maryland
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    Even fire 231/3.8 , if it's original that carb started about 1980. I can't tell for sure but maybe that's a deeper aftermarket th350 pan.
     
    Rich M., Jun 5, 2021
    #2
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  3. Jun 5, 2021
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Northern California
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    Looks to be an even fire 231.
    Pull the distributor to verify the pickup coil spacing is even.

    He needs to get parts quick..... so he can follow you to the Rubicon.
     
    Norcal69, Jun 5, 2021
    #3
  4. Jun 5, 2021
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
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    Looks like the 3800 / 231 I have that came out of a 1985 Regal.
     
    Oldpappy, Jun 5, 2021
    #4
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  5. Jun 6, 2021
    Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Virginia Beach, VA
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    the TH350 with front drive shaft . yep I wasn't happy with the fit
    had the same problems
    cut 2" off the side of pan and rewelded the inverted L back in
    still had to trim a bunch off the casting at yoke
    I mean it did work , just wasn't happy with it :whistle:
    also had to run slip joint near axle too
     
    Last edited: Jun 6, 2021
    Twin2, Jun 6, 2021
    #5
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  6. Jun 6, 2021
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Maryland
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    2 piece shafts and support bearings are not uncommon with auto swaps. A la Commando.
     
    Rich M., Jun 6, 2021
    #6
  7. Jun 6, 2021
    Lockman

    Lockman OK.....Now I Get It . 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Silver Hill,...
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    Underneath.JPG Every one above is correct. I have one in mine. That's the Tranny pan he's gonna run into. I believe that the way to run these auto's is to cut & & " L " fab the pan, like Ron said. We thought we could get by , with our layout......But the first time I compressed the front end, I wahmmo'd the pan. I still have to do mine , that is why I can't trail much right now Slip yoke has to go up close to the pumpkin. We used a Tom Woods custom shaft.
     

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    Last edited: Jun 6, 2021
    Lockman, Jun 6, 2021
    #7
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  8. Jun 6, 2021
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Maryland
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    That's a pretty undercarriage..
     
    Rich M., Jun 6, 2021
    #8
  9. Jun 6, 2021
    Lockman

    Lockman OK.....Now I Get It . 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Silver Hill,...
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    Yep,, Cousins had it all Powder coated,, back in '92 . Gotta cut my pan next winter.
     
    Lockman, Jun 6, 2021
    #9
  10. Jun 7, 2021
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Yep, thats a 231 in there.
    On a TH350 I had years back in a CJ5, I actually cut the side of the transmission case where the pan bolts on, maybe 1/8" or 3/16"? I remember the bolt heads hanging over the edge. Obviously the edge of the pan was cut back too. I made an 1/8" thick backup rail to make sure the pan gasket would seal. I also moved the engine over about 1" by modifying the frame mounts. You also have to use the small diameter u-joints too. Its real tight fitting a driveshaft along side the TH350, but it can be done.
    -Donny
     
    Keys5a, Jun 7, 2021
    #10
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