Recommendations for driveshaft balancing in ABQ?

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  1. mopardude505

    mopardude505 Member

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    I'm working on a '68 barracuda. Got it idling well but shakes pretty violently in drive. My best guess is it needs some driveshaft balancing.

    Does anyone know a decent shop in or around Albuquerque?
     
  2. rklein383

    rklein383 Well-Known Member

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    I presume in drive means going down the road when the drive shaft is actually spinning.
     
  3. mopardude505

    mopardude505 Member

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    Haha haven't quite gotten that far yet...so drive means up on jack stands with the transmission (904) in "D". For context, in Neutral and Park, I get the normal amount of vibrations when I give it some gas. A little engine vibration seems normal for the old V8. But when it's in "D" the shakes become much more pronounced. That leads me to think it might be an unbalanced driveshaft. But if you have other thoughts, I'd love to know! All potential diagnoses welcome :)
     
  4. mopardude505

    mopardude505 Member

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    But short answer: Yes, the driveshaft is spinning during the vibration. And vibration increases as speed/RPM increases.
     
  5. rklein383

    rklein383 Well-Known Member

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    Are your u-joints in good condition? Have you looked under the car when the driveshaft is spinning and is there any obvious signs of the driveshaft being bent?
     
  6. mopardude505

    mopardude505 Member

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    Hmm good question! How would I recognize a bad U-joint? When I replaced the transmission, the U-joint seemed fine...as in bearing were smooth, nothing too pitted.

    As for obvious bending of the driveshaft...I didn't notice any, but I'll take a closer look next time I fire it up. That's a great idea..and I don't know why I didn't think of looking at it while it was spinning!
     
  7. mopardude505

    mopardude505 Member

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    Additionally: How much extra space should there be on the end of the driveshaft that goes into the splines on the transmission (slip yoke)? We put a whole new 904 in this car, and I noticed that the driveshaft doesn't seem to go into the transmission as far as it did in the original transmission. The way I've judged this is looking at the exposed, shiny (non greasy) part of the slip yoke. In the new transmission, there's more of the slip yoke exposed outside the rear end of the transmission. But that may just be because the new transmission has a shorter rubber boot!! I wouldn't expect this 904 to be any shorter than the original one! (To my knowledge newer 904s weren't shorter than the earlier 904s.

    But it's my understanding that the slip yoke shouldn't bottom out in the transmission anyways. Correct me if I'm wrong and need a longer driveshaft!
     
  8. rklein383

    rklein383 Well-Known Member

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    • Like Like x 1
    • MoparLeo

      MoparLeo NRA BENEFACTOR LEVEL LIFE MEMBER FABO Gold Member

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      Took about 30 seconds to search on line for you.

      Best 3 Driveshaft Repair in Albuquerque, NM with Reviews - YP.com
      Alaso the jackstands need to be under the axle housing to keep the driveline in normal alignment with the trans and differential. And vibration is not normal on any Mopar V-8 that has not had any internal changes (Cam etc...) and is tuned properly.
       
      Last edited: Aug 17, 2021
    • Demonracer

      Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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      Try taking the shaft out & turning 180* on the pinion yoke.
       
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