I have a 2001 Jeep Wrangler TJ lifted 4in on 33s when driving accelerating between 40 + 70 I have a vibration on the floorboard and in the steering wheel I feel it under my feet and seat area when driving on a smooth Road and accelerating it starts at 40 miles per hour and get stronger and a more heavier vibration at 70 plus when you going at 70 it's like a rhythmic vibration like a Wawa type vibration and Loud cabin noise I have adjustable control arms upper and lower front and back and adjustable track bar front and back that have been recently added and it was aligned 400 miles ago I also had it read geared to 3.73 with a truetrac on the rear Dana 35 I'm in the process of finding a slip yoke Eliminator and a new rear drive shaft from Adams but I can't figure out what this vibration is caused by could it be my Driveline angle I will attach photos thank you so much for your help
Vibration between 40 and 70 MPH
- Thread starter McDonald548
- Start date
Vtx531
TJ Addict
Sounds like driveline vibrations. Looks to me like the rear pinion is pointed up to high. Try shortening your rear upper adjustable arms or lengthening the lower ones.
Always pull the front shaft to isolate a suspected shaft vibe.
Also look real close at the u joints for oxide/ bearing failure and touch for extreme heat.
Check the transmission mount carefully.
On a conventional shaft the pinion and tc output should be parallel or the pinion 1 degree below that for torque load lift.
Also look real close at the u joints for oxide/ bearing failure and touch for extreme heat.
Check the transmission mount carefully.
On a conventional shaft the pinion and tc output should be parallel or the pinion 1 degree below that for torque load lift.
Rubicon John
TJ Enthusiast
You could pull either driveshaft and drive it with only 1 in at a time to see if it’s the front or rear driveshaft causing it. Obviously you’d drive in 4hi to diagnose a removed rear shaft.
I ordered a Sye and driveshaft from Adam's today he said the yoke and driveshaft didnt look like the correct shaft and yoke if u notice the yoke is pulled way out and sagging
I ordered a new SYE AND DRIVESHAFT today cause the yoke and driveshaft are wrong and the yoke is sagging and extended to far and the guy at Adam's said hes suprised it is even engaging the shaft
I attempted to isolate a similar issue.. we adjusted the driveline angle to near zero.. rubicon tj with Dana 44s, it made a small change, but it did not solve the vibration. Pulled the front u joint and they were shot.. pulled drive line out after removing the skid plate, and found the trans support mount torn.. replaced all parts.. wow its like new.. hope you have sucess..
Right now you need to match the angle of the transfer case output angle to the pinion angle. Once you have the SYE installed then you will adjust the pinion angle to be about 1* below what the driveline angle is.
https://4xshaft.com/blogs/general-tech-info-articles/tail-shaft-conversion-kits
https://4xshaft.com/blogs/general-tech-info-articles/tail-shaft-conversion-kits
When we bought our used '04 TJ, it had all sorts of drive-line vibrations to sort through. one of the 'U'-joints on the rear shaft was shot, and the rear pinion angle was off. Once those were corrected, we still had a vibration that I could feel coming from under the driver's seat that started at around 50 mph. When crawling under the Jeep, nothing looked out of sorts, but when I grabbed the front drive shaft in the middle, I could move it up and down about a 1/8" in each direction. Turns out that due to the 3 1/2" lift that the PO installed, the front DS had been running over-extended and eventually wore out the slip-joint splines. Once we removed it and pulled it apart, you could see the groove mark all the way around in the splines. We replaced the DS with a new one from the local driveline shop (measured to the proper length for the lift), and the vibration was finally gone! Now it's a pleasure to drive.
Last edited:
Yeah when I had bought mine the previous owner put the lift on and cut all the front steering and suspension components on but failed to tighten it down also he put the wrong rear drive shaft on it's not long enough in the yolk is pulling out of the transfer case you can see it's pretty well almost to its limit before I probably would slip off of the output shaft it's got quite a angle and it's sagging so apparently I've been running the wrong drive shaft for three thousand miles of owning this but so far I re geared the front and rear diff put a truetrac the rear diff replaced the front and rear upper and lower control arms with core 4x 4 replace both front and rear track bars with jks redid the front brakes put new shocks on Rancho 5000 RS just ordered a slip yoke Eliminator from advanced adapters and then Adams rear driveshaft replace the camshaft synchronizer & valve cover gasket put new 33in tires on it and fresh U joints in the front drive shaft I will be taking it to a shop next week when my slip yoke Eliminator and Drive Shaft come in I really hope that this eliminates the vibration
Thank you I will be taking it to a shop next week to have the Sye kit and driveshaft installed and have the vibration tract and eliminated I would do the work myself but it's the cold months here in Wyoming and I've been fighting a life-threatening disease for 11 months and I'm improving just had my feeding tube removed and surgery 2 months ago so I'm still recuperating from all of that or else I would love to do the work myself
I can totally understand. I had someone do work on my TJ back when I was recovering from not walking for 6 months.
Hope it all goes good and glad you're getting better. Speedy recovery.
Thank you things seem 2 be getting better slowly I just cant wait to get back out to driving in the hills and get back to being able to eat again.
I hope everything is working for you and your feeling better too.
I was taking a migraine medication that caused severe chronic necrotizing pancreatitis
Similar threads
