4WD and 4 Auto vibration and thrum. Your thoughts Needed

[D60]

None of this makes any sense. The d/s is BINDING? What, at ride height from a 3" lift?

A longer d/s will not change angle. The t-case output is where it is. The pinion yoke is where it is. The difference in height and distance between the two will dictate angle to connect them, period.

Sponsored

 

[Black Jeep Convertible]

Update: transfer case binding (thought to be secondary to 3" lift)
I was told driveshaft angle is 10 degrees rather than 3 degrees.

What is the best way to remedy this??

A New driveshaft that is longer?

Anything else?

Thanks!

@Black Jeep Convertible @aldo98229 @Headbarcode @Notorious

Try to find an off-road shop near you for help

 

[D60]

You're still running the front stock rzeppa d/s?

 

[drvn]

You're still running the front stock rzeppa d/s?

Yes. Stock driveshaft.

I adjusted the lower control arms today. There was a little improvement.

 

[D60]

Yes. Stock driveshaft.

I adjusted the lower control arms today. There was a little improvement.

So you pulled some caster out of it? How much?

 

[drvn]

So you pulled some caster out of it? How much?

I did. Unfortunately, I have no way to measure the caster.... but its def less as I can tell its not tracking as straight. I adjusted the LAS as far as they'd go as installed by a shop (I'd have to take off for even more change). There remains vibration...but is maybe 20% of what it was before. I must have decreased the driveline angle less than what the dealer told me was 10%...but not down to the 3% they suggested. Hmmmm

 

[D60]

I did. Unfortunately, I have no way to measure the caster.... but its def less as I can tell its not tracking as straight. I adjusted the LAS as far as they'd go as installed by a shop (I'd have to take off for even more change). There remains vibration...but is maybe 20% of what it was before. I must have decreased the driveline angle less than what the dealer told me was 10%...but not down to the 3% they suggested. Hmmmm

I'm surprised the rzeppa shaft vibrates at just about any angle, but I guess it's got its limits....? No way the joints themselves should be binding at ride height with a 3" lift.

I guess you could try an aftermarket shaft w CV but my position is that the angles are still WAY wrong with a CV.

With a CV your pinion is supposed to be tipped up inline with your d/s and the only way to do that with a JL is cut and turn the inner C's.

I've got the MC front shaft and I get a little thrum at highway speeds in 4H with a MC 2.5" (more like 4") lift. My caster is somewhere around 6.5. The noise/vibe is just enough that I wouldn't want a FAD delete

 

[Senrusho]

What did this end up being. I have the same issue but I dont think it can be the geometry because I didnt have it until I'd had my lift on for a year.

Sponsored