Ford Racing Driveshaft

[Scott7512]

I just had my 93 LX on the highway yesterday and around 75 there is a slight vibration present. I could not tell where it is coming from. The car is hardly ever on the highway. Mostly a beer getter. It has an aluminum ford racing driveshaft and 3.55 gears. Should I change the mounting holes for the shaft at the rear end. I know that when you take off a shaft you should mark it and put it back the same way. Since it was a new shaft I did not put any marks on the rear end. Should I try rotating it?

 

[Mustang5L5]

I'd probably look at wheel/tire balance first, before missing with the shaft...


Unless of course there's a reason you suspect the shaft. You recently install it?

 

[Scott7512]

Shaft has been in for at least 8 months but the car has not been on a highway until yesterday. Even then it was only 6 miles.

 

[Mustang5L5]

rotate it 180 degrees and try it out again

 

[mikestang63]

rotate the driveshaft 180 as Mike said, then check the bolts are tight. Wheel balance usually comes on between 45-60 and goes away at higher speed. Have you checked the air pressure in all tires

 

[Shakerhood]

The shaft has a green or yellow paint mark and there should be a crayon line on the companion flange, they should line up and be in balance, if that doesn't work then try rotating as the guys said above.

 

[BCFDT-10]

Just thinking...How long has the car been sitting before this ride? Tires could be flat spotted.

Gearhead, country boy, Lt. in a City FD.

 

[Scott7512]

Tire pressure is at 30 psi cold on all. The car is normally only driven a couple times a week for short 10 mile trips. The other day I took it on a longer trip. I drove about 45 miles before getting on the highway. I am going to try rotating the shaft and also check the rear pinion angle because the car was lowered when I got it and I have since raised it back up slightly. If I don't find anything I am just going to live with it because it is very slight.

 

[General karthief]

Get the tires rebalanced too, more likely than a driveshaft problem.

 

[Noobz347]

add u-joints to the list of vibration causes

 

[JD1964]

Keep in mind that if tires get out of round from sitting, there's no way to fix it but replace the tires. They will balance out fine on a machine. But if they're not round, they will behave like an unbalanced tire, even if they are balanced.

 

[JD1964]

For those of you who store your cars, how do you prevent the tires from getting flat spots?

 

[Mustang5L5]

6 months or less...nothing. Longer than that I take them off.

I've never really had an issue with flat spotting. I usually inflate the tires to max pressure and when we get a warm day in the winter I might pull it out of garage to listen to it idle


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[2011rustang5o]

Car lowered? Either way what about drive line angles? I have the same drive shaft and I have a slight vibration too. Stock user control arms and the car is lower than stock. I know if you cause the drive shaft to bind it can vibrate.


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[Gearbanger 101]

For those of you who store your cars, how do you prevent the tires from getting flat spots?

Put it up on jack stands, with the suspension loaded.

 

[Moosee1955]

Gear bangers right put on stands. I had an 82 gt years back, that I didn't mark front yoke, when I put new u joint on. I had a vibration above 60mph. I put on a new joint, rotated front yoke, went away. If you suspect tires rotate tires, shake or vibration will move to front. You can also find a driveshaft shop that can check and balance if necessary. Theirs a technique, I've never tried it to balance shaft, by installing a hose clamp. Try the other methods first.


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