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331 Caddy to 53 Chevy 2 speed Auto?

Discussion in 'The Hokey Ass Message Board' started by Mr Diablo, Jun 22, 2011.

  1. Technical question help guys.... My Chevy is currently getting the Kustom trim of all time and my next thing I would like to do is fit a 331 Caddy motor and mate it to the original Auto...can this be done by a conversion kit and is there a kit available,
    I need to fit it to the original drive line as I have had THOUSANDS spent on the running gear and don't want to change it....Any help would be much appreciated
    By arty66 at 2011-03-31
  2. propwash
    Joined: Jul 25, 2005
    Posts: 3,858

    from Las Vegas

    Kinda doubt it....suggest you either keep the stovebolt or do the entire drivetrain. Those early PGs just didn't warrant a lot of adaptor attention from those in the business.
  3. rustypipes
    Joined: Sep 30, 2004
    Posts: 972

    from san jose

    is it a stock 53 54 powerglide? Even if you could or there was somehow a way Id think you would blow that drivetrain to pieces with a 331!

    Car looks great btw!
  4. Squablow
    Joined: Apr 26, 2005
    Posts: 15,876


    It's not going to bolt up, and building a custom adapter to make it work is going to cost more than just replacing the original trans. Also as others have mentioned the stock tranny will never hold up to the Cadillac engine.

  5. The early 2bbl carb 331's were only rated at 160hp so it could work if you could get it to bolt up. In '53 there was a fire at the Hydramatic plant so the Buick Dynaflows were used with the 331.
  6. DirtyEd
    Joined: May 16, 2009
    Posts: 362

    from Dallas Ga.

    No help on the motor,but I love the tail light treatment.My dad suggested I do the same thing on my car.I think I will now that I see how good it looks.
  7. steel rebel
    Joined: Jun 14, 2006
    Posts: 3,604

    steel rebel
    Member Emeritus

    Can't help you on the adaption but I love the idea of a Cad in your Chevy. and love your Chevy. Follow up on the Dinaflow lead.
  8. swissmike
    Joined: Oct 22, 2003
    Posts: 1,297


    Awesome car! Check out the Wilcap website for adapters for the early Cad. Probably have to use later auto trans.
  9. guys thanks on the advise and info...and yes DirtyEd do as your Dad says...
  10. ss34coupe
    Joined: May 13, 2007
    Posts: 4,211


    try Bendsten's in Minnesota - they make an adapter for the turbo 350 to early Cad motor. Don't think they have anything for an early powerglide.
  11. Man, I'd run an early Hydro over a Dynaflow. The 331 should be able to be mated to either the original one or the later dual-coupling one. Of course, that doesn't help you. You can probably get a Chevy 265 or 283 to mate up easily, or a 235/261 six, but the Caddy would require a custom adapter. And who knows if the early PG would hold up, unless you had it updated and built for heavy duty use.
  12. Its the torque tube that I am worried about, could the Dynaflow mate up?

  13. Stovebolt
    Joined: May 2, 2001
    Posts: 3,427


    I just got off the phone with a couple of your fellow wiseguy members who are having "issues" with Chev sixes.

    Any torque tube GM auto can be used with a torque tube with qualifications.

    The torque tube outer diameters are the same. You will need to make the inner driveshaft - front half non-Chev rear half Chev.

    Don Montgomery told me he ran a Buick 3 speed stick behind the 12 port Jimmy in his 32 3W. Half Buick driveshaft half early ford for the Halibrand Q/C he ran
  14. Snarl
    Joined: Feb 16, 2007
    Posts: 1,639


    331's have the long bell on the back right? I doubt you will get any automatic to work with that other than what came with it originally. I have seen adapters for it using a manual trans though. I believe Bendsten's has those.
    The buick trans idea seems to have the most merit since Buick did use a TT rearend. If the way the bell bolts up to the trans is the same, and the tailshaft splines are the same as Chevy, then it "should" work.
    Question then is how long is the 331/Buick trans combo? even if it works with the TT rearend, it may be too long to fit the engine compartment??
    You may also have issues with the floor, firewall, radiator position, steering and exhaust, motor mounts, etc....

    Pretty hard to beat a well dressed Stovebolt six....
  15. OldBuzzard
    Joined: Mar 8, 2008
    Posts: 878


    Maybe some things to look into:

    The early cast iron powerglides had a pair of "adapter" rings to get them onto the 6 and the V8. The bolt patterns between the ones for the 6's & V8's were different but... if you redrilled one of them to put the V8 engine side on your transmission you would have a V8 engine pattern on your transmission. There are Cad adapters for that. Lengths in the torque converter area may have to be played with. Somebody here might have reasons this won't work. If so, let's hear them. There could be some starter issues.

    Somebody put pictures of the rings on here a while ago and showed the differences between the 6 & 8 ones. I can't find them right now.
  16. Zig Zag Wanderer
    Joined: Jul 6, 2007
    Posts: 564

    Zig Zag Wanderer

    pre-55 GMC truck Hydramatics would have the TT rear coupling, just pair it with the Caddy Hydramatic bellhousing
  17. busguy71
    Joined: Oct 25, 2006
    Posts: 121


    how hard would it be to make an adapter out of 1/4" plate? Long as the flex plate and torque converter bolt to each other (use a chevy flex plate and have it drilled for the caddy if need be) adapter plate would do the job.... this is theoretical advice, dont know much about the specific application... yeah it would be tedious, but so what?
  18. OldBuzzard
    Joined: Mar 8, 2008
    Posts: 878


    Yes, it would. Have you ever removed one of those transmissions from an engine???
  19. rougebeats
    Joined: Jan 22, 2009
    Posts: 307


    My first thought after reading the OP. Im interested to see what will work as well.
  20. Guys you are all great and I thank you all for your interest in this. My six is dressed up with tri power and all the goodies but the idea of a 331 in it would top it off. I will follow up on on these post and keep you all updated. I get the Chevy back from the trimmers in 2 weeks, can't wait to post some pics. It's looking killa
  21. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,203

    from Kansas

    That extended bell housing throws a wrench in the works. If you could find the Dynaflow with the special adapter for the Cadillac (Oldsmobiles too), then you would have the torque tube stuff covered. But Dynaflows are slushboxes, so it really depends on what you really want. The GMC truck suggestion is viable and probably the best for performance without getting into big costs for adapters.
  22. Hoodlum Rocky
    Joined: Oct 24, 2007
    Posts: 62

    Hoodlum Rocky

    Just have to pipe in and say cool car man!!!! Look forward to see its new guts.
  23. aerorocket
    Joined: Oct 25, 2007
    Posts: 488

    from N.E. P.A.

    I agree thats a classy looking chevy. Are those Willys Aero tailights? In my opinion the only engine that could add to your car over what you have now would be a Caddy. Nice ride.
  24. Thanks Hoodlum... They are 48 Caddy tail lights aerorocket....


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