Radiator for 1970 GS Stage 1 4 speed

Discussion in 'Parts wanted' started by Weisguy184, May 19, 2018.

  1. flynbuick

    flynbuick Super Moderator Staff Member

  2. Dano

    Dano Platinum Level Contributor

    Jim, my understanding is SJ would be for the automatic transmission & later '70 4-sp. Cars, but that the early '70 cars 4-sp. Cars got a different pass. side tank w/o the cooler and I believe had an "SS" tag. Not sure when the switchover happed but I believe it was pretty early - Maybe in October or November.
  3. BrianTrick

    BrianTrick Brian Trick

    Both of the SS radiators that I had came with the plugs.
  4. flynbuick

    flynbuick Super Moderator Staff Member

    Could be. Both 70 4 speeds we have owned did not fall in that time window. I have heard someone say that some early 4 speed cars had radiators without the trans cooler hook ups. If true, maybe this caused a different radiator tag to be used during those early production months.
  5. flynbuick

    flynbuick Super Moderator Staff Member

    I have a spare radiator with the tag and one on a car. I will look.
  6. BrianTrick

    BrianTrick Brian Trick

    5F6A85C8-5B1F-4686-BC23-B01EF6310643.jpeg 07A09FB1-6B2C-41C3-A353-C5E5A08EFC1B.jpeg I think that is correct. The later cars got the plugs. When the change was made,not sure. I’ve had a few September/69 cars,and they had plugs. It could have been a matter of when they were used up,which plant,etc.
    They probably figured it was easier to have one less radiator to choose from,during assembly. The plugs would have been fairly simple to install.
    Not Buick,but here is the original from my 71 W30 4-spd 3:73,with HD-cooling,4-row radiator.
    If I remember correctly,the 71-72 plugs were a different size,compared to 70-older.
  7. GS44667

    GS44667 Worlds First Stage1 Conv

    Early 70 GS Fremont car no provisions. thumbnail_20180331_151953[2].jpg thumbnail_20180331_151958[1].jpg
    Dano likes this.
  8. Weisguy184

    Weisguy184 Well-Known Member

    Flynbuick,Thanks for checking your radiators. Would your spare radiator be available and if so can you post pics?
  9. Duane

    Duane Member

    Regarding transmission cooling line plugs installed in the radiators,

    I think you guys may have this a bit backwards, the 68 thru 72 Assembly Manuals show that the plugs "were part of the radiator assembly" and were to be removed prior to installing the transmission cooling lines in the radiators at assembly.

    This means all the radiators were sent to the assembly lines with the plugs installed. The manuals also show that the auto transmissions had plugs in them that were removed before assembly. This makes sense because it would stop any foreign particles from getting into the units before assembly.

    68 Assembly Manual page 7-7.1
    69 Assembly Manual page 7-12.1
    70 Assembly Manual page 7-11.1
    71 Assembly Manual page 7-8.1
    72 Assembly Manual page 7-6.1

    Last edited: Jul 10, 2018
  10. Brett Slater

    Brett Slater Super Moderator Staff Member


    This may be your best option if the search turns up empty.

    Brian has tried the part out and attests to its quality. That would be enough for me as I highly doubt I'd way overpay to have an original recored.

    Something to think about.
  11. Weisguy184

    Weisguy184 Well-Known Member

  12. flynbuick

    flynbuick Super Moderator Staff Member

    Just saw this. No it is my spare so it is not for sale. SJ tags show the combination of CF and IA tanks.
    Last edited: Jul 18, 2018
  13. 1970 STAGE 1

    1970 STAGE 1 Well-Known Member

    I just had an SJ built for $850.00 It is for an automatic car it has the cooler. The tanks are correct .
  14. buick64203

    buick64203 Just plum crazy Staff Member

    My 70 Stage 1 4 speed came with an automatic radiator (SJ with CF/IA tanks) as noted on the POBF. March build. By that time, they were sticking automatic rads in the 4 speed cars
    Brett Slater likes this.
  15. dl7265

    dl7265 No car then Mopar

    SJ isn’t an auto rad .
    They were factory in non Air 4-speeds . Air 350 cars . Ect Many applications . We’ve tracked these for years with build sheets early & late builds .
    The Air 4-speeds got the CD tank.

    Edit : All the Rad threads in here need a clear sticky .
    1970 STAGE 1 and Brett Slater like this.
  16. Weisguy184

    Weisguy184 Well-Known Member

  17. buick64203

    buick64203 Just plum crazy Staff Member

    Aaah, I was under the impression that they ran out of the trans cooler delete rads and used these in their place
  18. Jim Jones

    Jim Jones Wretched Excess

    My GSX came with an SJ. Stage 1, Automatic, No A/C. I believe the SJ radiator was considered HD cooling in 350 A/C equipped cars, and HD cooling in non-air conditioned 455 cars. Air conditioned 455 cars got a different radiator. I seem to recall SS code, but that is open to correction.
    Stage 2 iron likes this.
  19. 1972 Stage 1

    1972 Stage 1 Well-Known Member

    The automatic and 4 speed cars with A/C were equipped with a "SW" radiator, which has XS / IA tanks.
    Brett Slater likes this.
  20. Jim Jones

    Jim Jones Wretched Excess

    Thank you for that correction James. It has been so long since I have owned an air conditioned GS, my memory needs refreshed occasionally.
    DBS, Brett Slater and 1972 Stage 1 like this.

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