Superlift driveshaft vibrations...

[adarkang]

Well I finally got my superlift driveshaft and after I installed it, I took it for a test drive. Drove around for about 20 miles at 40mph and below, everything is fine. Then I decided to take it onto the freeway and test it out since that was where I was having issues with my stock driveshaft in with my current lift. everything seemed normal until I hit about 55mph +. Above 55 the driveshaft starts to rumble (vibrate) a decent amount. I got it upto 75 and the intensity of the vibration stayed the same from about 60-70mph then intesified around 75mph. That's when I got scared and let off the gas, I didnt want to push my luck. So basically, heres a list of the symptoms and before driveshaft and after driveshaft install.

After 5" RCD lift:

1) Stock driveshaft: no vibration til about 65+mph then the driveshaft started to vibrate very badly, to the point where I had to slow down the vehicle to 50mph to stop the vibration.

2) No front driveshaft: No noticeable vibrations.

3) Superlift driveshaft: Slight vibration starts at 55mph then remains contant to about 70mph then intensifies at 75mph.

 

[ExplorerDMB]

Have you left your front driveshaft out for a certain amount of time? What t-case do u have 4405?

-Drew

EDIT: i'm pretty sure you have the 4405... I had an issue with my front driveshaft at around 35/40 and up that it'll make a horrible noise and you could feel it on the floor boards. Turns out my tcase is shot. May be the chain, but we'll find out when I take it apart.

 

[adarkang]

Yes I have the 4405! but there really is not a noise.... the noise that I hear is a rumble like a constant vibration.

 

[ExplorerDMB]

Well, like I and TAXX figured out - the best way to figure out noises like this is a lift. I had access to the lifts at work, but wanted to figure the probably out without wasting time after work. I ended up having some time to do so and I found the problem right away. I still think your issue is in your tcase. I tried the stock and new shaft which puts different loads and angles on it, but about the same at the diff - and the MPH vibration issues would be different with each shaft. So either both shafts are fubar, or your tcase is.

-Drew

 

[adarkang]

Are you planning on rebuilding your transfer case? or having it professionally done?

 

[ExplorerDMB]

that brings up a good question - what is it called when a technician works on something? Is that professionally done or DIY?

Anyhow, yeah I plan on doing it myself. It isn't worth it (to me) to send it out and get it rebuilt. GLacier991 is doing a rebuild as well ...soon...sometime.

-Drew