 Drivetrain Woes |
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| gfg3 |
 Jun 22 2025, 07:49 AM
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#1
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Never Too Old  Group: Members Posts: 121 Joined: 5-January 15 From: Southern Virginia Member No.: 18,295 Region Association: None  |
My '75 1.8 has developed a vibration when in 5th gear. All other forward gears and reverse work just fine. Am I looking at tearing the trans apart or maybe a CV joint?
Thanks. George |
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| jim_hoyland |
Jun 22 2025, 07:58 AM
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#2
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Get that VIN ? Group: Members Posts: 9,805 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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Is the vibration constant at various RPMs ? Does it dissipate at say 4K ?
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| mlindner |
Jun 22 2025, 07:58 AM
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#3
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Senior Member Group: Members Posts: 1,687 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest
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George, under load in 5th, decelerating, coasting at speed in nuetral?
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| gfg3 |
Jun 22 2025, 10:21 AM
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#4
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Never Too Old Group: Members Posts: 121 Joined: 5-January 15 From: Southern Virginia Member No.: 18,295 Region Association: None |
Seems constant under constant load plus accel & decel. Coasting it goes away. Also goes away when I downshift into 4th.
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| gfg3 |
Jun 24 2025, 07:35 AM
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#5
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Never Too Old Group: Members Posts: 121 Joined: 5-January 15 From: Southern Virginia Member No.: 18,295 Region Association: None |
Any ideas, folks? I'm really baffled about this and don't want to tear out the trans unless I have to.
George |
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| Shivers |
Jun 24 2025, 07:49 AM
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#6
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Senior Member Group: Members Posts: 3,066 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
QUOTE(gfg3 @ Jun 24 2025, 06:35 AM)  Any ideas, folks? I'm really baffled about this and don't want to tear out the trans unless I have to. George Sounds like a good time to paint your drive axles and inspect and lube your CV's. If you find a bad one problem solved, if not you know where you need to look next and the axles are already out of the way. I hope it is a bad CV. |
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| Cairo94507 |
Jun 24 2025, 11:11 AM
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#7
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Michael Group: Members Posts: 10,371 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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CV's are my first thought too. (IMG:style_emoticons/default/beerchug.gif)
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| dr914@autoatlanta.com |
Jun 24 2025, 11:21 AM
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#8
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914 Guru Group: Members Posts: 8,185 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
yes maybe the cv axle
QUOTE(gfg3 @ Jun 22 2025, 06:49 AM) My '75 1.8 has developed a vibration when in 5th gear. All other forward gears and reverse work just fine. Am I looking at tearing the trans apart or maybe a CV joint? Thanks. George |
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| gfg3 |
Jun 25 2025, 09:50 AM
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#9
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Never Too Old Group: Members Posts: 121 Joined: 5-January 15 From: Southern Virginia Member No.: 18,295 Region Association: None |
Thanks everyone. Once the temps get below the high-90s here in Virginia, I'll slide under the car and take a look.
George |
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