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7/18/16 7:26pm - Original Message: '75 4 speed coup vibration'
Trent Gold Member
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Bellefontaine, OH - USA

1975 L-48 4spd Bright Blue tilt/tele/cruise/pw/Holly Carb.

Joined: 10/2/2014
Posts: 21
Hi guys,
My 75 C3 4 speed Coup has a pretty bad vibration at speeds of 45 and up. The steering wheel shakes big time and I can feel it in the seat too. My tires are like new and balanced.
If I push the clutch in while at speed and still in gear the vibration goes away.
My mechanic had it on the rack and couldn't find anything wrong, but did suggest that maybe the half shafts or drive shaft may be out of balance.
What do ya think?
Thanks in advance.

|UPDATED|7/18/2016 5:26:49 PM (AZT)|/UPDATED|

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7/18/16 11:11pm - Reply: 'Re: 75 4 speed coup vibration'
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Eagan, MN - USA

1981 Corvette Two-Tone Claret color, 4 spd, C7 Vert

Joined: 5/23/2007
Posts: 507
Bad Ujoint in the driveshaft?

|UPDATED|7/18/2016 9:11:24 PM (AZT)|/UPDATED|

      Only 23 years together
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7/19/16 9:20pm - Reply: 'Re: 75 4 speed coup vibration'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
If you rev the engine up in neutral does it vibrate? If not, then you prolly do have bad u-joints in the drive and/or half shafts. Another thing to check is the trans mount...if it is broken, or soggy, it will allow the driveshaft to run off-center, creating a vibration.

Joel Adams
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 Forums -> C3 Driveline Components
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