Vibration

[TFENT]

Originally Posted by rhipsher

Is the vibration coming from the rear. In other words if you reach behind you and put your hand on the rear where your two little compartments are can you feel it or is it coming through the sterring wheel?

That's a hard question to answer. Here is why. The car sits for long periods of time. It is equipped the Nitto 555's. That means when i do take it out for a drive the tires are flat spotted. I have to warn them up so there is a vibration in the front end until the tires warm up which doesn't take very long but its still there. After 15 mins it calms down quite a bit. I am taking it out for a long drive on Saturday and will be more sensitive when I do. I will check the rear area and report back.

[TFENT]

OK, Took it out for a nice LONG ride yesterday. Total about 225 miles. San Diego to LA and back. Speeds from bumper to bumper then a few races with an M5, Up to 125. I can feel most of the vibration in the rear and the shifter is buzzy. But not all the time. It was vibrating at 75-85 then above 90 it would smooth out. This is weird. I put it into neutral sometimes and it calms down. Under acceleration it get more pronounced. I do not think its a tire or tires. I think its the drivetrain, something in the drivetrain.

[rhipsher]

I'll bet my money it's a bad U-joint or two. If I were you I'd replace them all.

[4DSZR1]

Originally Posted by rhipsher

I'll bet my money it's a bad U-joint or two. If I were you I'd replace them all.

I don't want to derail the thread, just a quick question, are all six U-joints the same size?

Thanks
Rick

[Jagdpanzer]

Here is the info posted at Denny's Driveshafts for the C4 Corvette:

http://www.dennysdriveshaft.com/p423...ebuild_ki.html

Half Shafts use four Spicer 1350 series U-joints which measure 3.625 inches wide in both directions and 1.187 inch diameter on all bearing caps.

Main drive shaft uses two Spicer 1310 series U-joints which measure 3.219 inches wide in both directions and 1.0625 inch diameter on all bearing caps.

[jonszr1]

that u joint deal from dennys is a quality deal with the best u joints and straps around .

[4DSZR1]

Great info..... I love this place


Thanks

[FULLPWR]

Tom, did you figure out what it was?
I just put the tranny back in saturday, and its only this morning i notice the same exact thing you described. I did not pay attention to the position of the driveshaft as to the dif yoke when i took it apart a month ago, but the shaft did have a distinctive black mark on the side where the shaft weights are and the yoke had a orange mark, so i put it in "black Opposite Orange" unsure why the yoke didnt have the yellow mark as the manual states though..?? i havent driven it in four years and i really dont remember it having that vibration, my gut memory thinks it didnt... its real noticeable as excactly as you described it.
I think im gonna reposition it 180 like Rick did.

Luis

[TFENT]

Originally Posted by FULLPWR

Tom, did you figure out what it was?
I just put the tranny back in saturday, and its only this morning i notice the same exact thing you described. I did not pay attention to the position of the driveshaft as to the dif yoke when i took it apart a month ago, but the shaft did have a distinctive black mark on the side where the shaft weights are and the yoke had a orange mark, so i put it in "black Opposite Orange" unsure why the yoke didnt have the yellow mark as the manual states though..?? i havent driven it in four years and i really dont remember it having that vibration, my gut memory thinks it didnt... its real noticeable as excactly as you described it.
I think im gonna reposition it 180 like Rick did.

Luis

Luis:

No i haven't. I only drove it on Saturday. I will get these new u-joints all together this week or so and get them changed out.