Sounds like there is some DS issue, but I'll throw this out there anyway. I bought a '65 fastback last summer and had the same problem on the 1,200 miles drive home. It would vibrate pretty bad at 70 mph and worse the faster you went. The car had only 4,000 miles put on in the 20 years after it's restoration . Not enough driving and tires had flat spotted. New tires (on a set of 16" wheels I had gathering dust) completely solved the vibration.
Just had all four tires balanced and I STILL get the vibration. Went back to the shop that did the rear end and the pumpkin checked out okay. They even swapped out the pinion for the heck of it. The car sat for about a month, would that be enough to to get a flat spot? The tires are pretty much brand new and were full of air..
I'm so stumped. The rear end shop was stumped as well. We ran the car on jack stands up to speed and we were still getting the vibrations, almost like something is binding? Even in neutral! It goes away as the speed goes below 70mph.
Just had all four tires balanced and I STILL get the vibration. Went back to the shop that did the rear end and the pumpkin checked out okay. They even swapped out the pinion for the heck of it. The car sat for about a month, would that be enough to to get a flat spot?
Nope, a lot people store them for the winter (unfortunately sometimes six months for me) with no flat spot issues.
You ran it 70mph on jack stands?? Anyway, I would look at the axle bearing they did. Talk to the boss and have him speak to the guy that did the work. He will know if anything sounds odd. Did he cut off the old bearing, slide hammer, press? Bmfh? In my experience a tire will be worse at 55-60 and often gets better at 70 due to surface speed at that diameter.
If you had the vibration on jack stands and the wheels & tires were freshly balanced, then I'd look at the brake drums (balance) and axle flanges (bent). I've seen brake drums that have a high spot on the inside that drags on the shoes and as they heat up it makes it worse. You might want to have the drums chucked in a brake lathe and simply measured for runout first. You can always try chucking the drums onto a wheel balancer and watching them as they spin to see if they look bent. I'd also check the axle flanges with a dial indicator for runout both laterally (side to side) and radially (up and down). This would wobble the wheel enough to cause a high speed vibration that could go unnoticed at slow speeds.
You ran it 70mph on jack stands?? Anyway, I would look at the axle bearing they did. Talk to the boss and have him speak to the guy that did the work. He will know if anything sounds odd. Did he cut off the old bearing, slide hammer, press? Bmfh? In my experience a tire will be worse at 55-60 and often gets better at 70 due to surface speed at that diameter.
We actually ran it to about 120
The axle bearing was actually SLIDE off the axle about an inch from where it was supposed to be (friggen scary to see). The drive line guys said one whack with a hammer and the bearing popped right off. They pressed on a new one and said that it pressed on tight and secure, nothing abnormal?
I'm pretty sure that my problem is axle or bearing related at this point. The shop is insisting that the bearing is fine but they are not ruling out the axles. I'm popping off the axles and bringing them to the shop tomorrow to have them checked out for and bends. While they're off I'm going to inspect the bearings and maybe take the drums to check balance.
The axle bearing was actually SLIDE off the axle about an inch from where it was supposed to be (friggen scary to see). The drive line guys said one whack with a hammer and the bearing popped right off. They pressed on a new one and said that it pressed on tight and secure, nothing abnormal?
I'm pretty sure that my problem is axle or bearing related at this point. The shop is insisting that the bearing is fine but they are not ruling out the axles. I'm popping off the axles and bringing them to the shop tomorrow to have them checked out for and bends. While they're off I'm going to inspect the bearings and maybe take the drums to check balance.
The transmission mount is new.
Whoa! Where is the retaining ring that goes up against the bearing between it and the seal? Without this it's no doubt that the bearing would move.
The whole axle actually shifted outwards while the bearing stayed put. I took a picture because not only is it scary to know that I was a hammer tap away from losing an entire axle, but it was funny at the same time.
Axles are bent or have runout.....that & brake drums are pretty
much all you have left.
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Okay, shop number one said that my axles were fine and INSISTED that I need to buy their two piece drive shaft for my 47 year old car.
I call absolute BULL on that, and so do other people I've spoken to. Dropped the axles off at shop number two and they're going to check them out. If I find out that the axles were indeed bad I'm going to absolute flip that the other shop was trying to take advantage of me because I'm young. (It's happened before, don't you love seeing a mechanic's lies and knowing it?)
I ran the car on jack stands with the wheels and drums off, still had the same problem...
Just as a list of things I've checked to help clear things up. (Holy crap)
U joints
Drum balance
Wheel/tire balance
Drive shaft balance
Different pinon
Axles are being checked out
Tranny mount is good
Replaced rear leaf spring bushings (poly bushings)
New outer wheel bearing
Pinon angle good
One thing I did notice when the car was on stands and running is how much axle wrap the car has. Like WOW it bends them with ease!! Just by going through the gears to speed up.
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