TH350 dual pattern question

Discussion in 'Transmission & Driveline Topics' started by 1977nova, Jan 12, 2018.

  1. 1977nova

    1977nova Member

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    Jul 19, 2005
    canada
    Was there ever a th350 dual pattern bellhousing with non lockup?
     
  2. hoppin5478

    hoppin5478 Veteran Member Lifetime Gold Member

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    Tucson, AZ
    I dont recall what year they started using lock up converters but the BOP (buick,olds,pontiac) th350's were equipped with the dual bolt pattern housings. The chevy's got the chevy only bellhousings.
     
  3. budro6968

    budro6968 Veteran Member

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    Jax Florida
    I remember the non lock up in 70's Buicks and Pontiacs.
     
  4. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    Ringgold, GA
    Bell housing pattern doesn't effect the converter, lock or non lock. What year and combination are you asking about and is there a specific question? Not being an ass, the question is vague to a 2nd gen Camaro.
     
  5. 1977nova

    1977nova Member

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    Jul 19, 2005
    canada
    What I want to know is if you were to find a dual pattern bellhousing th350, would it guarantee the transmission being a lockup model.
     
  6. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    Ringgold, GA
    That wouldn't really be a guarantee. I'm not familiar with lockup converters in TH350 transmissions, I do know we had a new Olds in the 70's with a TH350 and it was not lockup. Hopefully someone with more experience will chime in.
     
  7. Gary S

    Gary S Administrator Lifetime Gold Member

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    I don't know what years dual pattern TH350s were made, but the TH350 went into production in 1969, and the lockup version appeared in 1980 in very limited use. Many of the 1980 TH350s were still the non-lockup version. So, we have 11 years of non-lockup TH350s in existence. Then, the 700R4 appeared in 1982 and saw heavy use replacing the TH350 on most applications. That tells me that 1981 and 1982 TH350s should be lockup versions, and the few made after that would also be made. (about 2 years plus a few of lockup ones)
    Using this as a gauge, it appears that by far the largest number of TH350s in existence will be the non-lockup versions.
     
  8. Twisted_Metal

    Twisted_Metal Moderator Staff Member Lifetime Gold Member

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    Bloomington, MN
    You can tell if it's a lock-up TC if the TH350 has an electrical plug.
    There should be plenty of BOP TH350 transmissions in existence with the extra mounting holes and no electrical plug.
     
  9. hoppin5478

    hoppin5478 Veteran Member Lifetime Gold Member

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    Tucson, AZ
    I'm not sure where your looking for the transmission at but I've had quite a few early to mid 80's Regal's and Cutlass's with the lock up th350/BOP bellhousing. You do have to watch out though, although most of them got th350 some had a th200c which wasn't very good from what I remember. The 200r4 was also available but if my memory serves me correctly it was only an option in the 85 and newer models. I would think most salvage yards would have a decent number of cores from these cars.
     
  10. Fbird

    Fbird Veteran Member Lifetime Gold Member

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    atlanta, ga
    the lock-up th350 was refered to as a th350-C . Bastard stuff when trying to get valvebody stuff...IIRC.
    Not many of the dual pattern lock-up 350c's out there..... because there were only a FEW non-CHEVY V-8 powered vehicles. All the v_6 stuff got the th200 =(junk) .then came the th200r4 which eliminated the th350c .
     

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