She's a beaut isn't she?

She's going in the shop at 8:00am tommorrow for some underside inspection. I've got a vibration that starts at about 75-80mph and just gets exponentially worse as the speed increases. At 95-100mph it's vibrating so bad that if you hold the shifter your hand will feel like someone's beating it. I believe it's coming from either:

A: Driveshaft
B: U-Joints
C: Rear End

Also I just had a unique squeaky-squeak pop up. The car squeaks when you start off, but only when the driveshaft is under load. If you're light on the gas or push the clutch in the squeaky squeaky goes away. It seems to be doing it too fast to be a wheelbearing, and doesn't correspond to engine-rpm, only speed. So I'm guessing it's one of the U-Joints.

Concur?

--- Also if that's the problem and the shop fixes it, I'm praying an' hopin' it will solve my vibration. If it does I'll seriously consider keeping this car. Right now it is for sale. I'm asking $3,500.

Located at zip code 35630 or 38834 if anyone's interested. (Florence, AL & Corinth, MS)

 

My guess is on universal joints too. It's easy to assume you need play in the u joint to call it worn but they can seize up and groove the bearing surface too.

If you buy new ones with grease nipples inbetween the cross. Install them so it's closing the grease nipple hole as opposed to opening them while under load.

 

Well I changed my u-joints myself today. Took me and a friend a little over an hour to replace both of them. It eliminated the squeaky-squeaky and MOST of the vibration but the car still has a bad vibration once you get up to about 90mph. I'm assuming it could be one of the following:


A: Bad Tire/Warped Wheel/Failing Wheel Bearing
B: Unbalanced Driveshaft (didn't see any weights missing off of it)
C: Rear End out of shim.

Seeing as the car has aftermarket wheels and an aftermarket 4:10 rear end, I'm gonna say it's the rear end or a wheel.

*sighs*... it's really annoying hunting this stuff down.