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Author Topic: Vibration When Shifting  (Read 993 times)

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september2019

  • Message Board Member not current AMGBA Club Member
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  • Posts: 18
Vibration When Shifting
« on: August 11, 2019, 03:24:38 PM »
I have a 1976 MG Midget but hardly drive it.  When I took it out for the first time this year, I noticed a lot of vibration when shifting from 2nd gear all the way to 4th. It really shakes in 4th.

I heard it could be my u-joint going bad

Any thoughts what it could be

Thanks
Brad Fuller

JohnTwist

  • AMGBA Club Tech Staff
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  • Posts: 73
    • University Motors
Re: Vibration When Shifting
« Reply #1 on: August 11, 2019, 03:33:46 PM »
The only difference between sitting in the driveway with the engine revving at 3500 rpm and driving down the road at 3500 rpm is what is turning.  There are four wheels and one driveshaft turning – that’s it.  So your problem lies in one (or more) of those.
If the front wheels are out of balance the steering wheel shakes.  If the rear wheels are out of balance your butt shakes in the seat. 
If the driveshaft is out of balance the whole car shakes – especially the rear view mirror.   

The driveshaft can be out of balance because of faulty U joints, loose bolts, a frozen slip joint, or it can be bent.  Remove the driveshaft and take it to a truck shop that rebuilds driveshafts.  Have them change the U joints and balance the shaft.

Hope this helps.  Let me know what you found.

SAFETY FAST!
John H Twist
University Motors Online

SAFETY FAST!
John H Twist
University Motors Online
100 East Beltline Avenue SE
Grand Rapids, MI  49506

616-307-6737
johntwist@universitymotorsltd.com
www.universitymotorsltd.com

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