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04-05-2008, 07:01 AM | #1 |
68 Coupe 289
Join Date: Apr 2005
Location: North carolina
Posts: 44
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68 Vibration
My 68 coupe 289 C4 Auto has had a vibration that goes through it like a wave since I had the tranny rebuild about a year and a half ago. It speeds up with the engine and not so much with the speed of the car. I had the rearend rebuild, new motor mounts and new Ujoints but still have the problem.
I noticed that when I replaced the Ujoints that the output shaft on the C4 was movable. Is that right I could grab it and wiggle it around. I was wondering if that might be the problem and if so how do I fix it? The tranny is now out of warranty and I don't think I would take it back there anyway. My next step is probably the transmission mount. It doesn't look bad but who knows. Thank for the help.
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04-06-2008, 07:55 PM | #2 |
Registered Member
Join Date: Mar 2004
Location: Minnesota
Posts: 950
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Re: 68 Vibration
Seems like it would be your transmission. When the yoke is in the tailshaft of the trans you can wiggle it around? I dont know much about C4's, (or any auto ford for that matter, i've always had a manual) but I highly doubt thats right. On the other hand I have a transmission for my buick (A 2spd S/P) that the output on the trans will wiggle around, and to my knowledge it works fine. (though not when the driveshaft is installed) Its probably a good idea to check the mount, but if its tight I wouldnt replace it.
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Alex |
06-27-2008, 09:49 PM | #3 |
"Old School Gearhead"
Join Date: Oct 1998
Location: Peru, Illinois
Posts: 617
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Re: 68 Vibration
You said that you installed new motor mounts. Were they stock replacements, or were they Polyurethane? If you use a stiff motor mount, it can transfer vibration to the entire car at certain rpm's. I have "Prothane" mounts in my '68 with a 331 stroker. It will send a vibration through the car at about 2,000 rpm. After some investigation, I figured out that it was the new motor mounts.
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1985 Mustang GT '85 GT "Red302" 12.96@107.1 N/A ... Sprayin' for the 11's 2003 Torch Red Mach1 '68 Fastback ...331 Stroker "Restomod" |
01-07-2009, 08:53 PM | #4 |
Registered Member
Join Date: Sep 2008
Location: Big Sky Montana
Posts: 7
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Re: 68 Vibration
I have had problem like that with my 67 coupe and it was my motor mounts and they were loose. that my be your problem but it also might your tranny
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Nate |
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