A833 rear bush Problem!!!!

[punisher72]

Hello all.
I have a big vibration which feels like my tailshaft.
Only thing is i had a new 3" tailshaft with 1350 unis built a little while ago. Meaning i havent done more than 1000 miles.
The diff was rebuilt,i rebuilt the gear box and ive just installed a brand new Mcleod flywheel and twin plate clutch.
I replaced the clutch and flywheel as my clutch was slipping but also i thought the flywheel was out of balance........
Now i had a new bush installed in my g/box for the slip yoke but i feel it was a little big???
I can move the yoke up and down when in the box about 2mm or 80thou.

Would this cause my Tailshaft to vibrate like hell from 80 mile and up? Its really bad at 100mph.
Im sought of hoping this is the case as ive done everything else other than a new harmonic balancer.
It definately feels like a tailshaft out of balance..........
Thanks in advance for any help/opinions.

[Chryco Psycho]

how far is the slip yolk into the rear of the tranny . I doubt that is the issue , more likely to be the tires . Try running it on a hoist so you can see what is going on .

[punisher72]

Thanx Chryco. I had a look through my Mopar chassis book and it says to take rear wheels and drums off and run the car on stands. I will give this a go today
If that's all it is which I hope,then grinning.

[punisher72]

I ended up taking wheels off and still have the vibration.
I'm going to try a hose clamp on the tailshaft today and see if it's out of balance by rotating clamp at 1/4's first front and back. It's worth a shot. If that dosent work then I'm going to pull the box again and see if the rear shaft is bent?? The yoke btw only sits out by an inch. Just enough to slip Uni past diff yoke to install it.
While box is out I will change the rear bush as well.
I've also tried shims under diff saddles changing pinion angle and this has not helped either.....
Also when I rev the motor out of gear there is a slight rumble at 2600 rpm only.
Getting very frustrated and I have till Friday to sought it out as Mopar Sunday and Mopar mayhem is happening....

[Chryco Psycho]

Well you are narrowing it down at least

[punisher72]

Well as it turns out Chryco. I tried the hose clamp and it took out the vibration. I took it for a spin and it was sweet. So I rang where the shaft was built and organized them to have a look. Turns out that it wasn't balanced properly in the first place!!! Spend big bucks on it being right and it wasn't wtf!!!
Anyway they replaced unis re balanced all free of charge and now all is good yah!!
Now I have a vibration from 2600 to 2800 which is obviously the motor,so I'm all happy now
Bring on the weekend of fun skids and drag racing