75 mph vibrations.

[okiemoto]

Did you not read the post? He went over my concerns. We found slop in the front output bearing. Sorry we didn't put a magnetic angle finder or a dial indicator on everything we touched. We determined the alignment is not the issue. The front pinion angle is not off...

 

[Jasonmm]

It can still be the driveshaft angle causing the vibration. Tire wear has nothing to do with the driveshaft angle. I would have had him check it anyway to rule it out. It could very well be the transfer case I get the same vibration and I believe I do have a little play in my t case too. But I don’t believe the tire wear is a valid indicator to your caster angle. If it was tow or camber it would show better but you might have an alignment set up with a different caster angle. Here is an explanation of the caster setting and it says it’s the least likely to show tire wear.
https://www.tirebuyer.com/education/how-does-caster-affect-driving caster is not the real problem, your caster might be correct but if your front springs have settled the driveshaft/pinion angle will change and that is where the vibration comes from. Before you take the driveshaft out check the angle of the driveshaft and the angle of the pinion. They need to be the same or the drive shaft needs to go straight into the pinion. It can be a degree or two down which will deflect to straight when a load is applied, at least it will straighten on leaf spring vehicles, these might not torque the axles as much with control arms.

 

[sag2]

It is pretty unlikely the transfer case is the problem. In all the trucks I repaired as long as runout was under .007 you were fine.

 

[okiemoto]

I re read my 2am update above and it reads like I was being rude and that isn't the case. I appreciate all the advice I've gotten. Apparently I am grumpy when I wake in the middle of the night.

It is getting to the point I'm contemplating trading it off. The alignment guy found the output bearing movement and swears this is the issue. He told me I'd be wasting money I could put into the transfer case.

I have an angle finder and a dial indicator coming. I'm also going to get back in touch with the dealer and see what they tell me as far as the transfer case goes.

 

[ranger 393]

I had the 70 mph vibration right after i bought my truck new.. I spaced the center carrier down 1 inch and vibration has not been back... IMO the center carrier is to far from where the two drive shafts connect, and spacing it down lesse

 

[GCroyle]

okiemoto,

Any luck or conclusion to the vibration problem?

Gary

 

[okiemoto]

No update yet. I pulled the transfer case and had it rebuilt back in October and also found a very slight crack and leak in overdrive housing so I pulled it and had a trans swap shop everything over to a new housing for me.

I got everything back together minus the front driveshaft. I'm sketched out to put the front dfiveshaft back in. The OD housings are not cheap nor is this a fun job to do on your back in the dirt.

I plan to put the shaft in this weekend and take it for a test drive. Very hopeful the play in the front output was my issue but I have my doubts. I will report back

 

[okiemoto]

I had the 70 mph vibration right after i bought my truck new.. I spaced the center carrier down 1 inch and vibration has not been back... IMO the center carrier is to far from where the two drive shafts connect, and spacing it down lesse

Ranger I'm not sure if you read my posts. My truck is also a qcsb. No carrier bearing in rear shaft. Also truck drives perfect without front shaft in.

 

[ranger 393]

Ranger I'm not sure if you read my posts. My truck is also a qcsb. No carrier bearing in rear shaft. Also truck drives perfect without front shaft in.

Yep, sorry I missed that . Disregard

 

[okiemoto]

Not the update everyone wants to see but an update none the less.

Had a whirring buzzing feeling coming from the truck with only the rear shaft in. Drove it 120 miles to my new driveshaft shop pulled the shaft in their parking lot and found that slip yoke had a little wear on it. Also there is a plug in the center of slip yoke that is pressed in and it was able to be pushed or pulled in and out. The shop guy asked me if the truck was real wet underneath when I replied no he asked if the transfer case had any fluid in it at that point!

I checked t case and it was full. Totally dodged a bullet on that one. While I had it iut I had them replace the neapco joints with Spicer non greasables and rebalance the assembly as well as a new slip yoke. Truck drives better than ever before.

This weekend I am putting the front driveshaft in and hopefully have a conclusion. If not looks like I'll be banging my head against a wall til I trade it off.

 

[Brian Benedict]

Please, don't leave us hangin. Was the rear drive shaft the issue?
I have the same problem but more after my front dbl cardon on the front drive shaft went out and exploded my tcase as well as the overdrive housing mounts. I replaced the tcase and got a new overdrive housing plus a new front drive shaft. The vibrations I used to think were normal, (I hadn't had this truck for more then a few months), were noticeably worse. I am thinking the rear drive shaft but it is over $500 to fix and balance.$850 for new aluminum one. Not sure I want to spend that money and have it still vibrating from something else. I'm not techy/mechanical enough for the other angle issues you were concerned about.

Let us know what you found out please.

 

[bcbender]

Also truck drives perfect without front shaft in.

I may be too late to this one, but my horrible vibration @ 72-75mph was the front drive shaft. Dealer replaced almost the entire rear drive line (front balancer, yoke, CS-bearing ujoints).. still there. I pulled the front shaft and GONE! 75$ for rebuild and balance of Cardan and front ujoints here at Fleet Pride in Greensboro and smooth as butter.