Alright guys I've got a vibration somewhere that I can't seem to find. It comes on at about 67mph and goes through 71. then fades up until 75 where it gets worse again. Above 80 it starts to fade.

Things I've done: All new U joints, tires balanced, checked driveshaft and all weights are still there, and the rear pinion is tight.

Any idea where I can look to find it??

Most likely not. I've seen from the outside what death wobble is. It a balancing problem or shock problem. I've been along side a Dodge on a motorcycle and watched in super close up mode of the axle jumping off the pavement and a tire nearly making contact with the fender as it oscillates in a circular motion. The vehicle has to slow down to nearly like 30-35 MPH before the violent oscillation stops.  More that likely the death wobble is going to be a rotational mass that is out of balance typically a tire(s).

On ‎11‎/‎8‎/‎2015‎ ‎3‎:‎07‎:‎51‎, Mopar1973Man said:

If it was me. I would have the tire rebalanced for absolute zero. Some shops allow for 1/2  or a bit more.

I remember when I worked at a tire shop the bigger tires were deemed "balance" when they were less than 1. Other than that you end up with weights placed in random locations which isn't right.

38 minutes ago, gh0stman said:

I remember when I worked at a tire shop the bigger tires were deemed "balance" when they were less than 1. Other than that you end up with weights placed in random locations which isn't right.

Typically that a sign of other issues wheel wise when end up with scattered weights. It could have excessive run-out or other issues. Higher the speed more precision is required. 

10 hours ago, Mopar1973Man said:

Most likely not. I've seen from the outside what death wobble is. It a balancing problem or shock problem. I've been along side a Dodge on a motorcycle and watched in super close up mode of the axle jumping off the pavement and a tire nearly making contact with the fender as it oscillates in a circular motion. The vehicle has to slow down to nearly like 30-35 MPH before the violent oscillation stops.  More that likely the death wobble is going to be a rotational mass that is out of balance typically a tire(s).

I had to get down to 5mph for it to stop  

Replaced this tonight. I took it to the last place it wobbled and didn't feel it even try to wobble. 1 down 1 to go!

Hit your finger with a hammer?

20 minutes ago, Royal Squire said:

Hit your finger with a hammer?

Lol broke it near the joint Saturday when I was removing the U joint. Swung a touch too hard

Ouch,  I got my hand really bad with a 3# hammer when I was doing by u joints haha.

Done my share of smashing fingers. My Dad always said to take care of your hands so when you get old they will still work. Didn't always listen to him

This is the first one I've actually broken. Smashed em plenty of times but this one I hit just right.

On 11/9/2015, 10:19:36, TFaoro said:

Found the looseness. Bushing on the axle side of the track bar. I'll go pick one up at napa and see if that fixes at least the death wobble

That is a fairly common cause of some death wobble. 

 

 

It really is worth ditching traditional weight balancing and I wouldn't hesitate to order up a set of dyna-beads for at home installation. All it takes is a jack stand, air compressor, a schrader valve tool, and  a pair of pliers to remove the POS wheel weights. 

Place the jackstand under the axle of the corner you are working on as close as you can get it. Remove the schrader valve. Once the air is gone (weight is now on the jack stand and not deflated tire) use the provided straw and pour the beads in. Reinstall the valve and inflate. You can remove the weights while it inflates. Repeat. 

When I first installed centramatics on my truck the made my 80% worn BFG KM2's smoother than any tire I had ran and quieted them down. They had just previously been balanced too. 

Les Schwab won't install tires over spacers and even thou the centramatics are only 0.060 thick they consider them a spacer so I sold the centramatics and run beads now. 

I do still run centramatics in the trailer and can tell a difference on how much stuff moves inside. 

Edited November 11, 20159 yr by AH64ID

The centramatics look nice, and would probably be the route I go (if I do anything). I don't have places put the tires  on for me. I don't trust them after the last time I took it in and watched them work

23 hours ago, AH64ID said:

That is a fairly common cause of some death wobble. 

 

 

It really is worth ditching traditional weight balancing and I wouldn't hesitate to order up a set of dyna-beads for at home installation. All it takes is a jack stand, air compressor, a schrader valve tool, and  a pair of pliers to remove the POS wheel weights. 

Place the jackstand under the axle of the corner you are working on as close as you can get it. Remove the schrader valve. Once the air is gone (weight is now on the jack stand and not deflated tire) use the provided straw and pour the beads in. Reinstall the valve and inflate. You can remove the weights while it inflates. Repeat. 

When I first installed centramatics on my truck the made my 80% worn BFG KM2's smoother than any tire I had ran and quieted them down. They had just previously been balanced too. 

Les Schwab won't install tires over spacers and even thou the centramatics are only 0.060 thick they consider them a spacer so I sold the centramatics and run beads now. 

I do still run centramatics in the trailer and can tell a difference on how much stuff moves inside. 

Curious AH64ID...

I know Cowboy made that article on using BB's and air soft BB's is that a option in your book too? I was considering getting a few boxes of BB's and measuring out what Cowboy figured and just installing then to the tires by breaking one bead.

On 11/11/2015, 11:10:37, TFaoro said:

The centramatics look nice, and would probably be the route I go (if I do anything). I don't have places put the tires  on for me. I don't trust them after the last time I took it in and watched them work

 

The centramatics are nice as you can reuse them for many sets of tires/wheels.

They do take some grinding to make room but that isn't a big deal.

 

10 hours ago, Mopar1973Man said:

Curious AH64ID...

I know Cowboy made that article on using BB's and air soft BB's is that a option in your book too? I was considering getting a few boxes of BB's and measuring out what Cowboy figured and just installing then to the tires by breaking one bead.

 

It should work. You will probably need 4-5oz of weight.

No need to break a bead if you use a weight that fits in the valve stem.

Thanks John... I'll being think about doing this very soon!

I've used #8 steel shot in gocart tires when I was racing back in the day

Is there an official write or anything of this BB install? I need pics in order comprehend anything!

The airsoft bb's of regular bb's will do the same thing? could it be that simple? If it is I am going to try it.

Air soft bobs are plastic aren't they?  Wouldn't it take a lot of them?

I think they are plastic.....

So I put my new rims and tires on yesterday. The vibration is the exact same as it was before and at the exact speeds. This tells me it wasn't tires. So I've been thinking about when this started. TMK it was after having the repair work done on the body and fixing the rhino Lining. Then I remembered we got some overspray on the driveshaft but I didn't think anything of it. I think I'll yank the shaft out and see if I can clean all of the liner off.

It won't take much to throw a driveshaft out of balance.