Register now to get rid of these ads!

Powerglide makes loud bang when put in reverse

Discussion in 'The Hokey Ass Message Board' started by Weston, Apr 25, 2012.

  1. Weston
    Joined: Apr 17, 2012
    Posts: 11

    Weston
    Member
    from Boise

    Hey everyone, kind of scratching my head over this one. I have a 327 in my 64 impala with the powerglide transmission. When I start the car up and shift into reverse the motor jumps several inches and makes a terrible loud banging sound. If i put it in neutral and start it it goes through the gears just fine. Any help would be greatly appreciated. Thanks
     
  2. alumslot
    Joined: Mar 5, 2008
    Posts: 597

    alumslot
    Member

    I would think it would be a motor mount or something wrong with the drive shaft. You should make a introduction post first.

    Jim
     
  3. BJR
    Joined: Mar 11, 2005
    Posts: 10,968

    BJR
    Member

    You have a broken motor mount!
     
  4. Weston
    Joined: Apr 17, 2012
    Posts: 11

    Weston
    Member
    from Boise

    Should I change the transmission mount too while I'm at it?
     
  5. Rickybop
    Joined: May 23, 2008
    Posts: 10,410

    Rickybop
    Member

    You mean while you're doing your introduction? No...after. :D
     
  6. Weston
    Joined: Apr 17, 2012
    Posts: 11

    Weston
    Member
    from Boise

    Haha alright alright. I'll do an introduction
     
  7. RagtopBuick66
    Joined: Dec 12, 2011
    Posts: 1,180

    RagtopBuick66
    Member

    If one mount is broken it could be an indicator of the condition of the other mounts. If the car is something you would rather drive than work on every day, just take one full day and do all of them at once, transmission mount included. Especially since you'll already have all the tools out that you will need. That way you don't need to worry about having to screw with them another day when you would rather be out cruising.
     
  8. Rickybop
    Joined: May 23, 2008
    Posts: 10,410

    Rickybop
    Member

    Glad you took it well, Weston...lol. Welcome to the Hamb.

    Don't hit the gas too hard with that broken motor-mount...she'll take off on ya!
     
  9. Weston
    Joined: Apr 17, 2012
    Posts: 11

    Weston
    Member
    from Boise

    Thanks for the advice. Would the loud banging sound just be the motor slamming against the frame? It only does it into reverse and not through the other gears
     
  10. skull
    Joined: Jun 26, 2007
    Posts: 498

    skull
    Member

    the motor is lifting up and then slamming back down.

    it is because of the rotational torque of the motor, just as with a non-posi rear-end only one tires spins when you do a burn out.

    Later :cool:
     
  11. Weston
    Joined: Apr 17, 2012
    Posts: 11

    Weston
    Member
    from Boise

    Awesome. Thanks man. Makes sense
     
  12. Weston
    Joined: Apr 17, 2012
    Posts: 11

    Weston
    Member
    from Boise

    Thanks man
     
  13. hotrod40coupe
    Joined: Apr 8, 2007
    Posts: 2,561

    hotrod40coupe
    Member

    How is your neighborhood? I could be a drive by...
     
  14. BJR
    Joined: Mar 11, 2005
    Posts: 10,968

    BJR
    Member

    Replace both motor mounts and the transmission mount. Don't drive it with a broken mount, if the engine lifts it can jam the gas pedal linkage wide open. Put a square of plywood or short 2 x 6 under the oil pan and lift the motor slightly with a floor jack to install the new motor mounts. You must use something on top of the jack to spread out the weight or you will crush the oil pan. Then move the jack under the transmission to lift it to do the transmount.
     
  15. Check the bearing in the middle of the driveshaft, and the support. I'm not sure if it's called the 'propeller shaft bearing' or 'midshaft bearing and support'. I may be totally el-wrongo on both names... It's been a while-

    If I member right, a bad motor mount will make that stuff waller around in the tunnel and make a noise like a bunch of stuff banging around. (cause that's what it is)
    Good luck.
     
  16. Weston
    Joined: Apr 17, 2012
    Posts: 11

    Weston
    Member
    from Boise

    I appreciate the advice. Gonna tear into it tomorrow. I'll post an update soon
     
  17. Weston
    Joined: Apr 17, 2012
    Posts: 11

    Weston
    Member
    from Boise

    It's Boise Idaho haha. The only drive bys are hipsters on there bikes heading to the co-op
     
  18. Sheep Dip
    Joined: Dec 29, 2010
    Posts: 1,572

    Sheep Dip
    Member
    from Central Ca

    Carrier Bearing
     
  19. Imperial Kustom
    Joined: Dec 20, 2007
    Posts: 293

    Imperial Kustom
    Member


    Carrier bearing.
     
  20. I wonder what it was?
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.