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Re-geared, now I have a vibration above 50 mph

I highly doubt it's an axle shaft, since they're still spinning the same speed as they were before. The only way it would be a bad axle shaft was if the gear installer somehow messed one up on removal and install. And yes, I would think the axle bearings/seals would be dead by now if that were the case.

Seeing as you have an Adams rear shaft and I have a bad rear Adams shaft (2 of them), I am very suspecting that the shaft is bad. More likely than something being wrong in the axle, anyways.
 
If it was the axel shaft you would still feel the vibration when you were driving with just the front shaft. The axel shafts would still have been spinning, that actually eliminates anything in the rear axel with the exception of possibly the pinion bearing.

What control arms do you have again?
 
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Bent axles vibrate more like a tire out of balance. Yours is a high speed drone, drive shaft type speeds. You seem to have covered everything, except having someone else actually check the balance, that is why I suggested it.
 
Brantley said:
I highly doubt it's an axle shaft, since they're still spinning the same speed as they were before. The only way it would be a bad axle shaft was if the gear installer somehow messed one up on removal and install. And yes, I would think the axle bearings/seals would be dead by now if that were the case.

Seeing as you have an Adams rear shaft and I have a bad rear Adams shaft (2 of them), I am very suspecting that the shaft is bad. More likely than something being wrong in the axle, anyways.
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You'd think after spending $265 for a drive shaft that you'd have a well balanced piece. I certainly hope it's the drive shaft at this juncture.

jeepndogs said:
If it was the axel shaft you would still feel the vibration when you were driving with just the front shaft. The axel shafts would still have been spinning, that actually eliminates anything in the rear axel with the exception of possibly the pinion bearing.

What control arms do you have again?
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That was my thoughts, but wanted to throw it out there for clarification. I have Metal Cloak controls arms in the front, double adjustable Metal Cloaks for the rear uppers, and 8 year old Currie arms for the rear lowers.

Rob5589 said:
Bent axles vibrate more like a tire out of balance. Yours is a high speed drone, drive shaft type speeds. You seem to have covered everything, except having someone else actually check the balance, that is why I suggested it.
Click to expand...

This will probably be my next course of action. It's the cheaper option right now. Any recommendations in the Sac Valley area? I have Santa Rosa Driveline in my neck.

Also considering handing the jeep over to Cloak Works and let them find the problem. That will be the last ditch effort.
 
Driveline Service in my home town of W Sac is very good. I have used them personally and we referred customers there when I was wrenching.
They have a shop in Redding that may be closer to you but I have no experience with them personally.
 
West Sac would be closer for me. I'm still having a hard time buying that my drive shaft has a balance issue, and my reason is this, When I regeared, I did the rear axle first. The vibes began as soon as I drove it home and got it on the freeway to 55mph. That was with the factory drive shaft. It was fine before the regear, so even though the drive shaft is spinning a bit faster, why the vibes all of a sudden? Out of all the folks that regear and don't have vibes, why do a select few have issues? It baffles me.
 
bobthetj03 said:
West Sac would be closer for me. I'm still having a hard time buying that my drive shaft has a balance issue, and my reason is this, When I regeared, I did the rear axle first. The vibes began as soon as I drove it home and got it on the freeway to 55mph. That was with the factory drive shaft. It was fine before the regear, so even though the drive shaft is spinning a bit faster, why the vibes all of a sudden? Out of all the folks that regear and don't have vibes, why do a select few have issues? It baffles me.
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So I'm confused, do you still have the factory rear driveshaft?

My understanding is at this point you have Adams front and rear shafts (and SYE) and you're on your 2nd front shaft? Or maybe I'm assuming?
 
Brantley said:
So I'm confused, do you still have the factory rear driveshaft?

My understanding is at this point you have Adams front and rear shafts (and SYE) and you're on your 2nd front shaft? Or maybe I'm assuming?
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Sorry for the confusion. It's been over a year since the re-gear and thousands of dollars thrown at my jeep with no resolution.
My current configuration is this.
1. Metal Cloak adjustable control arms in front lower/upper.
2. Metal Cloak double adjustable rear uppers.
3. 8 year old Currie rear lowers with JJ's.
4. 2nd Adams front driveshaft.
5. Transfer case rebuilt by a trusted transmission shop with new chain, bearings, seals, and Advanced Adapters SYE installed.
6. Adams rear drive shaft installed.
7. Lost count at how many pinion adjustments I've made.
8. motor mounts/trany mount inspected and in good shape
9. 9 year old JKS adjustable front track bar.
10. factory rear track bar with OME relocation bracket.
11. 10 year old OME 2.5" lift with 3/4" coil spacers to level out jeep.
12. all body mounts inspected and in good condition (Cali jeep, so no rust)

Think that about sums it up. I can pull the rear drive shaft, run in FWD(4hi) and get no vibes. I pull the front drive shaft and run 2WD and still have vibes, but slightly less(expected with no front drive shaft spinning).
 
bobthetj03 said:
West Sac would be closer for me. I'm still having a hard time buying that my drive shaft has a balance issue, and my reason is this, When I regeared, I did the rear axle first. The vibes began as soon as I drove it home and got it on the freeway to 55mph. That was with the factory drive shaft. It was fine before the regear, so even though the drive shaft is spinning a bit faster, why the vibes all of a sudden? Out of all the folks that regear and don't have vibes, why do a select few have issues? It baffles me.
Click to expand...
Good question. It has been a looong time since I was doing gears but, I cannot recall one time where a customer returned or called and complained about vibrations induced by a gear swap. I can't recall all you have tried but, have you swapped out the yoke? It is possible that it was machined off center and issues just didn't show up until after the re-gear. If you have the DS checked and all is good, may as well swap the yoke and see what happens, you don't have anything to lose at this point, except 40-50 bucks.
 
bobthetj03 said:
Sorry for the confusion. It's been over a year since the re-gear and thousands of dollars thrown at my jeep with no resolution.
My current configuration is this.
1. Metal Cloak adjustable control arms in front lower/upper.
2. Metal Cloak double adjustable rear uppers.
3. 8 year old Currie rear lowers with JJ's.
4. 2nd Adams front driveshaft.
5. Transfer case rebuilt by a trusted transmission shop with new chain, bearings, seals, and Advanced Adapters SYE installed.
6. Adams rear drive shaft installed.
7. Lost count at how many pinion adjustments I've made.
8. motor mounts/trany mount inspected and in good shape
9. 9 year old JKS adjustable front track bar.
10. factory rear track bar with OME relocation bracket.
11. 10 year old OME 2.5" lift with 3/4" coil spacers to level out jeep.
12. all body mounts inspected and in good condition (Cali jeep, so no rust)

Think that about sums it up. I can pull the rear drive shaft, run in FWD(4hi) and get no vibes. I pull the front drive shaft and run 2WD and still have vibes, but slightly less(expected with no front drive shaft spinning).
Click to expand...

You just had the sye and ds done recently, correct? And both it and the old shaft vibe the same way?
 
Rob5589 said:
Good question. It has been a looong time since I was doing gears but, I cannot recall one time where a customer returned or called and complained about vibrations induced by a gear swap. I can't recall all you have tried but, have you swapped out the yoke? It is possible that it was machined off center and issues just didn't show up until after the re-gear. If you have the DS checked and all is good, may as well swap the yoke and see what happens, you don't have anything to lose at this point, except 40-50 bucks.
Click to expand...

I had a local offroad shop swap out the front diff yoke and check the front gears when I suspected it was the front that was the problem. I have not changed out the rear diff yoke yet.
 
Okay, now I understand.

To me, the only thing that's even left anymore is the rear shaft or something on the rear axle (unlikely).

I would have been skeptical of blaming the rear shaft at first, but you have vibes still after all the things you've done, and you have a rear shaft from the same company that I've had two problematic rear shafts with. I always hear good things about Adams yet here I am with problems, and it sure seems like it's the same issue for you. You won't know unless you either pay to get the rear shaft rebalanced or go buy another one from Tom Wood or request Adams to send you a second one and give it a try.

My local shop (called Precision Drivetrain) was going to charge me like $129 to balance my shaft. At that point was when I called Adams and got him to send me a second one. Whenever I get the money, I'm buying a new one from Tom Wood. If I still have problems, I'm burning the Jeep to the ground. (kidding).
 
Rob5589 said:
You just had the sye and ds done recently, correct? And both it and the old shaft vibe the same way?
Click to expand...

Yes SYE/DS just recently done. According to my butt dyno, I would say the vibes are mostly the same, maybe a bit less intense than before the SYE/DS swap. I still get the rhythmic vibe that increases in intensity and then subsides, (verummm, verummm, verummm,), then randomly will be constant (verummmmmmmmmmmmmmmmmmmmmmm), then will subside all together, but only for a second or two. Onsets at 50mph, then is pretty constant and annoying at 65mph.
 
So, no vibes until the gear swap. Then vibes with the stock shaft and no sye. Still having vibes with new sye and new ds, but to a slightly lesser extent. If it were me, I would try a new yoke. And quite honestly I can't say with any type of certainty it will help. But you have seemingly tried everything else at this point. @Brantley had/has issues with his Adams shaft but, yours has the same vibes, a touch less, with both the factory shaft set up and the sye/Adams shaft.

The only other thing I would say is maybe the vibes were there prior to the gear swap but you didn't pay attention to it. It's that thing where you have done some kind of modification and then you are now focused on what was just done, almost looking for a problem that may or may not exist, if you know what I mean/makes sense.
 
Rob5589 said:
So, no vibes until the gear swap. Then vibes with the stock shaft and no sye. Still having vibes with new sye and new ds, but to a slightly lesser extent. If it were me, I would try a new yoke. And quite honestly I can't say with any type of certainty it will help. But you have seemingly tried everything else at this point. @Brantley had/has issues with his Adams shaft but, yours has the same vibes, a touch less, with both the factory shaft set up and the sye/Adams shaft.

The only other thing I would say is maybe the vibes were there prior to the gear swap but you didn't pay attention to it. It's that thing where you have done some kind of modification and then you are now focused on what was just done, almost looking for a problem that may or may not exist, if you know what I mean/makes sense.
Click to expand...

I know what you're saying. You'd really have to experience these vibes yourself to understand my frustration. There is no way in heck these vibes were there before. I could drive my jeep at 75mph all day long and not feel these vibes before the re-gear. My wife even verified the vibes were there when they weren't before. I do appreciate everyone's input to my conundrum though, so don't let my frustration come across as rude or obnoxious. Like you said, changing the rear yoke is inexpensive, and the only thing left I haven't changed out. I'm still undecided on whether I want to spend the time and money to have the rear drive shaft balance checked, so maybe I'll do the yoke first then go from there. Knowing that Brantley had problems with his Adams driveshafts leaves me wondering if mine is bunk also.
 
bobthetj03 said:
I know what you're saying. You'd really have to experience these vibes yourself to understand my frustration. There is no way in heck these vibes were there before. I could drive my jeep at 75mph all day long and not feel these vibes before the re-gear. My wife even verified the vibes were there when they weren't before. I do appreciate everyone's input to my conundrum though, so don't let my frustration come across as rude or obnoxious. Like you said, changing the rear yoke is inexpensive, and the only thing left I haven't changed out. I'm still undecided on whether I want to spend the time and money to have the rear drive shaft balance checked, so maybe I'll do the yoke first then go from there. Knowing that Brantley had problems with his Adams driveshafts leaves me wondering if mine is bunk also.
Click to expand...

No way man, I feel your frustration. Since you are sure it wasn't there prior, your choices are; swap out the yoke, have the current shaft checked, get another from Adams, try a Tom Wood or Driveline Service shaft, or some kind of combo of those. Obviously the yoke is the cheapest and you can diy that one. Put a new seal while you are at it. Couldn't hurt giving Driveline Service and/or Tom Wood a call and explain the situation. Educated/experienced opinions from those that know far more than us knuckleheads couldn't hurt :D
 
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What really sucks about this whole mess is no one knows why one jeep has this and another with the same set up doesn't. I tried Tom Wood shafts in mine and itv as still there, I spent a few hours on the phone with them also and they even said some Jeeps you just can't dial it out of. Evyone has suggested to me the lock out kit to stop the front shaft from spinning.

I even spent an hour or so on the phone with Jesse from high angle driveline and he said the same, some Jeeps do it and some don't and I should do a lock out conversion.
 
jeepndogs said:
What really sucks about this whole mess is no one knows why one jeep has this and another with the same set up doesn't. I tried Tom Wood shafts in mine and itv as still there, I spent a few hours on the phone with them also and they even said some Jeeps you just can't dial it out of. Evyone has suggested to me the lock out kit to stop the front shaft from spinning.

I even spent an hour or so on the phone with Jesse from high angle driveline and he said the same, some Jeeps do it and some don't and I should do a lock out conversion.
Click to expand...

Sadly, I don't even have that option since my vibes go away running just the front drive shaft.
 

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