This is topic vibration when goin above 70 in forum Tech Talk at Northern California Ford Owners  .


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Posted by white93 (Member # 1076) on :
 
I just bought an 88 GT.

A trim, h/c/i. stock driveshaft, 3:08's

When I acclerate after 2nd, into 3rd the shifter vibrates.
I was told it could be a driveshaft, or something in the rear end?

When i put the car on a jack today, the rear tires if you pull on them they make a kinda clunking noise and move a tiny tiny bit. is that normal??

Any advice is greatly appreciated! I would love to actually floor it in this thing!
 

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Posted by Blue Oval (Member # 2548) on :
 
did u try tightening the lug nuts?
 

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Posted by white93 (Member # 1076) on :
 
Yeah, I just did that. But it didn't do anything for it..

[ February 14, 2004, 07:02 PM: Message edited by: white93 ]
 

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Posted by onesicklx (Member # 285) on :
 
my old car vibrate a lot, so i change the stock drive shaft for a aluminum one and it stop after that...good luck...
 

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Posted by Vortech88GT (Member # 1076) on :
 
Tomorrow I'll be checking U joints and transmission mount, But i think it's something to do with the rear end...
 

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Posted by Black94 5.0 (Member # 655) on :
 
Does the car still vibrate if its in neutral at around 70mph?....

With the stock gears, my guess would be the driveshaft...

.....Does the car have a rear disc brake conversion?....
 

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Posted by Vortech88GT (Member # 1076) on :
 
Drum rear, And it does make the vibration when going about 70+ when in neutral..
 

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Posted by hidnn.o.s. (Member # 1219) on :
 
ttt for ya

Like the new sn
 

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Posted by hidnn.o.s. (Member # 1219) on :
 

quote:

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Originally posted by white93:
When i put the car on a jack today, the rear tires if you pull on them they make a kinda clunking noise and move a tiny tiny bit. is that normal??

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I believe that is completely normal.

I still think it is either the tranny mount or the driveshaft. I would toss in an aluminum driveshaft no matter what. That will help if not solve the problem.

When I drove the car home from Pacifica, the vibration wasn't near as bad when it was in neutral.

Goodluck with the problem. Hope you get it solved real soon and get the cats off and enjoy the 380 (+ -) that it will put to the wheels!
 

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Posted by Vortech88GT (Member # 1076) on :
 
Well today I'll check U joints, I was going to put a n aluminum driveshaft in but Sacramento Mustang closed right when I got off work yesterday, then today they're closed because it's sunday..
But hopefully it'll solve the problem, Thanks for the info!
 

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Posted by 89saleen (Member # 3083) on :
 
Also check motor mounts. My mounts were cracked, wich over time made the motor/tranny shift on their mounts, making the drivetrain vibrate in the same way around 70mph. Aluminum d/s is good idea too.

[ February 15, 2004, 07:21 PM: Message edited by: 89saleen ]
 

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Posted by street_illegal_stang (Member # 1554) on :
 
if it does it in neutral then its your drive shaft
i gets worse after a while.it'll start clunking very bad soon when coming to stops.
i had this prob with my 89 gt.replace it with a stock or alum.
if you don't power shift i get the stock shaft its three times cheaper.
 

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Posted by Vortech88GT (Member # 1076) on :
 
I bought an overpriced one from sac mustang.... Works great now!!

So did my speedo cable..
 

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Posted by hidnn.o.s. (Member # 1219) on :
 
Clark, how does the car feel now

Glad to see you went with the driveshaft
 

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Posted by SlowStockFox (Member # 1081) on :
 

quote:

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Originally posted by hidnn.o.s.:
Clark, how does the car feel now

Glad to see you went with the driveshaft

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Feels great, Driveshaft was the problem indeed.

Let me know when you're in the Sacramento area and I'll take you for a ride
 

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