Very Bad Vibration

[mark4g63t]

Just finished up the AWD Swap and took it for a test drive down the street. It has a serious vibration happening and is very sloppy.

Things I know:
The carrier bearings on the driveshaft seem to be in great condition, no rips cracks or anything and they spin freely on the shaft no problem. I can move the shaft in the bushings but was told it looked normal. Video of said play https://www.youtube.com/watch?v=i_my9ekvx1s

The u-joints are becoming worn, the front is ok, the middle is smooth as butter, but the rear is pretty notchy.

The shaft is straight when it is hanging on the car and has no forward or backwards play at all.

The rear drivers knuckle I believe is bent causing that wheel to have a bunch of positive camber and toe. Crazy amounts. The other side is pretty negative on camber and good on toe visually.

The rear divers side also has a bad wheel bearing that I am changing when I put the new knuckle on.

Going to be hopefully putting a new knuckle on it tonight along with a Precision u-joint to see if that helps any.

Any other suggestions?
Thanks, Mark

[mark4g63t]

This is the u- joint I was going to get http://www.oreillyauto.com/site/c/de...Stores=true#at

And here is where I got my info from.
http://www.oreillyauto.com/site/c/de...Stores=true#at

[b00sted_spyder]

Please do not get Precision U-joints!

[b00sted_spyder]

That notchy rear joint probably has a lot to do with the vibration. Does the tubes have any dents in it? It's hard to tell if the driveshaft is straight unless you have it on a balancer to check for runout.

[mark4g63t]

ok lol. Only the OEM ones?

The driveshaft tube is dent free.

[b00sted_spyder]

Originally Posted by mark4g63t;400 730

ok lol.

The driveshaft tube is dent free.

I had to say it asap. Usually customers bring in their driveshaft to balance after they installed precision u joints. They have end play like used old joints. Get some quality joints. I don't know if Spicer makes joints for dsm driveshaft but the oem shouldn't be too much.

[b00sted_spyder]

I would suggest a balance after installing new joints. You might get lucky but most of the time it gets out of balance.

[mark4g63t]

Yup just saw that they only come with 1 of the 3 different sets of snap rings

[b00sted_spyder]

I don't know if you're planning to get it balanced but I would definitely recommend buying new hanger bearings and all 3 joints if you do balance it.

[mark4g63t]

ok I may just try to replace the u-joint without a balance and see if it still vibrates. How much do balances normally go for? This vibration is terrible at like 5mph and over. Can't go more than 20ish without feeling like something is going to break.

[mark4g63t]

can anyone chime in, if the toe was out far enough would that cause a very bad wobble/ shake vibration?

[dsmghost]

Originally Posted by mark4g63t

can anyone chime in, if the toe was out far enough would that cause a very bad wobble/ shake vibration?

No

[dsmreck]

where can u get them balanced?

[polishmafia]

^ What dsmghost said. Toe will not cause a vibration. The only things that typically cause a vibration when it comes to wheels and tires are a bent rim, unbalanced wheel, or very, very bad wheel bearings.

[b00sted_spyder]

Originally Posted by mark4g63t

ok I may just try to replace the u-joint without a balance and see if it still vibrates. How much do balances normally go for? This vibration is terrible at like 5mph and over. Can't go more than 20ish without feeling like something is going to break.

3 piece would be a weird one. We usually charge 2 piece and then add an additional shaft. 2 piece balance is around 140 without tax added. I believe adding an additional one is around 50-60. I'm not sure if we havet the fixtures for the dsm flanges since we rarely balance them. This price includes straightening the shaft with heat as well. Otherwise they suck to balance out. something else must be bad if it'it's vibrating at 5mph. didnt you do a ring and pinion on that rear diff?

[b00sted_spyder]

Originally Posted by dsmreck

where can u get them balanced?

Proven force, catco, most driveshaft shop should have balancers. But of course, you want the best right? I've seen other shop's work and they are garbage.

[dsmreck]

holy shit thats crazy expensive. I guess if you need it you need it.

[b00sted_spyder]

Originally Posted by dsmreck

holy shit thats crazy expensive. I guess if you need it you need it.

Yep, a lot of trucks needs it. Plus we build a lot of custom driveshaft. I am planning to build a custom one once I go awd. A 2 piece shaft instead of the factory 3 piece.

[dsmreck]

thats very cool i plan on just buying the dss when i need it. mark i have the ds that i twisted the u joints out of at pg last year if it comes down to needing spare parts altho it deff wasn't pretty when it happened

[mark4g63t]

Originally Posted by b00sted_spyder

something else must be bad if it'it's vibrating at 5mph. didnt you do a ring and pinion on that rear diff?

Yes I did but it went very smoothly and no issues seemed to pop up. It was pretty straight forward.

I think any u-joint is better than the rear one. I'm going to post a video of it

https://www.youtube.com/watch?v=HFu8...ature=youtu.be

Can see it being notchy and kinda "sticky"