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Hot Rods 1951 Buick rearend question

Discussion in 'The Hokey Ass Message Board' started by punisher7, Jun 12, 2014.

  1. punisher7
    Joined: Jun 24, 2010
    Posts: 369


    I am looking at getting a 51 Buick Super hardtop that has a dynaflow trans in it. How will the car do at highway speeds? I have searched quite a bit online and cannot find much info. As far as the current owner knows it is all stock, running but not driving. Thanks
  2. 52_Super
    Joined: Jul 4, 2013
    Posts: 6

    from Olathe KS

    I have a 52 hardtop, all original running gear and it does great on the highway. Runs at 70 mph with no issues. Not sure what the RPMs are but it's not topped out. Still some room left under the pedal for passing
  3. Don's Hot Rods
    Joined: Oct 7, 2005
    Posts: 8,319

    Don's Hot Rods
    from florida

    When I was a kid we had a 48 Roadmaster convertible and every year we traveled from Pa to Florida for vacation. It went right down the road, and my Dad was not a slow driver. That big straight 8 would just loaf along at highway speeds.


    Last edited: Jun 12, 2014
  4. saltflats
    Joined: Aug 14, 2007
    Posts: 10,078

    from Missouri

    Cool photo Don.
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  5. punisher7
    Joined: Jun 24, 2010
    Posts: 369


    Thanks for the replies guys. That is a great photo Don, thanks for sharing!
  6. csimonds
    Joined: Jul 24, 2009
    Posts: 546


    The 51 Buick, because it is an auto, has really good highway cruising gears in the rearend. My 50 was a 3 on the tree and was tough to cruise on the highway.
  7. scotsmerc64
    Joined: Mar 28, 2007
    Posts: 123


    The dynaflow works just fine at hi way speeds in my 51 super. Like 52_super said, at 65-70 she still has some pep for passing.

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  8. LONG
    Joined: Aug 20, 2011
    Posts: 292


    I think there is still 2 different axle ratios for the dflow. should be stamped on the bottom housing. I cruise 65-70 mph well. can hit 80mph but I backed down immediately. I am not running a tach. next on the list.
  10. Greetings I had a 1947 Buick Super with a three speed that would run best at 70 to 90 miles a hour and give me 22 mile to the gallon all day long!Uncle Bill
  11. Hnstray
    Joined: Aug 23, 2009
    Posts: 11,443

    from Quincy, IL

    Uncle Bill............where can you run downhill all day long???? :)
  12. Crazyolman
    Joined: May 24, 2014
    Posts: 188


    All of my 1951 and 1952 Buicks would run 70 MPH all day long but I never got 22 MPG even coasting down hill with the engine off. They did get a steady 14 to 15 MPG though. You should find the 51 has a 3:42 rear gear and the engine will be turning about 2800 RPM at 70 MPH with 760 X 15" tires.

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