srmitchell
NAXJA Forum User
- Location
- Mckinleyville (Humboldt) CA
First- The jeep
01 Xj- 4.0/AW4/ np231
4.56 gears/33's
3.5 inch RE lift with RC long arms
HPD30- rebuilt recently- Pinion bearings are brand new (3 weeks ago)
Tom Woods front DS-Rebalanced and reworked by them -a year ago
New PORC SYE/good working front shaft- used in the rear
The subject-
OK! So I've been fighting this ever since I regeared to 4.56. Vibes start at 59 mph+, droning, pulsating vibration... Soaks through the whole body, and is a low bass frequency. Gets worse as it gets faster. No vibes with the front shaft removed.
I have tried
-Pinion angle at zero degrees, above zero, and below zero. Now sits directly at zero.
-3 different front driveshafts. All with varying degrees of vibration.
-Now running a custom, tom woods double cardan shaft. Had to replace the pinion-position u joint because it had bad needle bearings, but it was rebalanced by TW over a year ago. (Not since I did the ujoint however)
-Checked the pinion multiple times... torque is good, bearings are new
-New motor/ tranny mounts- No change
-Tires are balanced. (Wouldn't make a difference, it's smooth without the front DS.)
-Triple, quadruple checked all front driveline/ suspension parts- All good.
I thought it was the transfer case
With 178k miles, I figured it was the front case bearings. I noticed a slight bit of play in the front output.
So I bought a low mileage, (60k miles) 231 case, swapped a PORC sye into it, and swapped the whole case under my jeep yesterday. No change
See- new and pretty (kind of)
So after swapping in a whole new tcase... it still vibes. I've spent close to $700 on trying to fix this issue... With no results. It's unbearable to drive over 60mph. Is the only answer a hub kit? I'm not even geared that low... 4.56 on 33's?
I need some serious help, I'm beyond frustrated.
This sucked btw- LOL
Thanks guys.
Columbus
01 Xj- 4.0/AW4/ np231
4.56 gears/33's
3.5 inch RE lift with RC long arms
HPD30- rebuilt recently- Pinion bearings are brand new (3 weeks ago)
Tom Woods front DS-Rebalanced and reworked by them -a year ago
New PORC SYE/good working front shaft- used in the rear
The subject-

OK! So I've been fighting this ever since I regeared to 4.56. Vibes start at 59 mph+, droning, pulsating vibration... Soaks through the whole body, and is a low bass frequency. Gets worse as it gets faster. No vibes with the front shaft removed.
I have tried
-Pinion angle at zero degrees, above zero, and below zero. Now sits directly at zero.
-3 different front driveshafts. All with varying degrees of vibration.
-Now running a custom, tom woods double cardan shaft. Had to replace the pinion-position u joint because it had bad needle bearings, but it was rebalanced by TW over a year ago. (Not since I did the ujoint however)
-Checked the pinion multiple times... torque is good, bearings are new
-New motor/ tranny mounts- No change
-Tires are balanced. (Wouldn't make a difference, it's smooth without the front DS.)
-Triple, quadruple checked all front driveline/ suspension parts- All good.
I thought it was the transfer case
With 178k miles, I figured it was the front case bearings. I noticed a slight bit of play in the front output.
So I bought a low mileage, (60k miles) 231 case, swapped a PORC sye into it, and swapped the whole case under my jeep yesterday. No change
See- new and pretty (kind of)

So after swapping in a whole new tcase... it still vibes. I've spent close to $700 on trying to fix this issue... With no results. It's unbearable to drive over 60mph. Is the only answer a hub kit? I'm not even geared that low... 4.56 on 33's?
I need some serious help, I'm beyond frustrated.
This sucked btw- LOL

Thanks guys.
Columbus