High speed vibration at 75 mph

[Mr. Bills]

I have a pretty good handling TJ, but I have a hard time understanding the need for 75 miles per hour plus speeds...

The prevailing speed on the Interstate near me is 80 mph in the left lane. If you can't go at least 75 you are stuck in the truck lane going 62.

 

[AndyG]

The prevailing speed on the Interstate near me is 80 mph in the left lane. If you can't go at least 75 you are stuck in the truck lane going 62.

a lot of these big cities like Birmingham and Atlanta if you aren't on the gas you will absolutely be ran over.

 

[2006TJ1]

a lot of these big cities like Birmingham and Atlanta if you aren't on the gas you will absolutely be ran over.

We have an express lane in ATL that works like a one lane toll road to avoid traffic. 75+ is the expected speed. People don't pay extra money just to go slow.

 

[lrb6805]

The factory service manual has a procedure whereby you add a worm-gear clamp onto the driveshaft tube about 6" from the forward yoke. The screw of the clamp is the weight. The procedure is made to solve driveline vibration complaints when all else fails. Think of it as fine-tuning. Don't for a second think that D/L shops get anything exact and things are different when it's bolted into the vehicle. Rear axle I/P yoke for instance.

I put the Jeep up on stands (frame supported) and left the jack on the pumpkin to position the axle where it would normally be (some weight on the stands). Then I used a free vibration analysis on my iphone and had the wife ref up to 55mph where my vibration started. I had marked the driveshaft with a felt pen in 45 deg increments and I was able to find a spot where the vibration was at a minimum and left the clamp.

On the road, it made a huge difference. Barely any vibrations. As per the service procedure, I have now added a second clamp and will move this either side of the original clamp to fine tune it further - see if it improves.

My driveshafts are in top shape with all new Spicer components and I had them rebalanced by an experienced shop. It didn't help! As I pointed out, there are other components that come into play once the D/L(s) are installed.

Might be worth a try. 2 stainless worm gear clamps = $2.50

I know this is a little old, but do you have a PDF of this procedure?

 

[lrb6805]

The factory service manual has a procedure whereby you add a worm-gear clamp onto the driveshaft tube about 6" from the forward yoke. The screw of the clamp is the weight. The procedure is made to solve driveline vibration complaints when all else fails. Think of it as fine-tuning. Don't for a second think that D/L shops get anything exact and things are different when it's bolted into the vehicle. Rear axle I/P yoke for instance.

I put the Jeep up on stands (frame supported) and left the jack on the pumpkin to position the axle where it would normally be (some weight on the stands). Then I used a free vibration analysis on my iphone and had the wife ref up to 55mph where my vibration started. I had marked the driveshaft with a felt pen in 45 deg increments and I was able to find a spot where the vibration was at a minimum and left the clamp.

On the road, it made a huge difference. Barely any vibrations. As per the service procedure, I have now added a second clamp and will move this either side of the original clamp to fine tune it further - see if it improves.

My driveshafts are in top shape with all new Spicer components and I had them rebalanced by an experienced shop. It didn't help! As I pointed out, there are other components that come into play once the D/L(s) are installed.

Might be worth a try. 2 stainless worm gear clamps = $2.50

I know this is a little old, but do you have a PDF of this procedure?