FJ62 vibration in 4wd at about 40 mph and up?

[75pinz]

4x4 speed

That's why it is 4hi. So you can go fast. Every vehicle I have ever owned can go as fast as you want it 4x4hi. 4 low the only limit is the rpms...Seems funny to me to think that people think this. How would you get across Montana or something on the interstate in the snow going 35? I routinely run as fast as they will go in 4x4 and that's how they were designed. it is just a differential in front like the rear.

 

[AndyR]

Half-cooked?

Cahilc wrote:

"Wouldn't 180 degres just invert the problem ?"

Kinda makes sense.

"180 to 180 shouldn't make a difference unless the drive shaft is specifically balanced."

As djanis99 mentioned, there are weights tack welded to the DS (but you're right, I don't want to crawl under and look!)

So you're saying unbolt part #3 and turn it 90 degrees? (assuming it's a square bolt pattern)

I don't know if the orientation of part #3 is critical, but if part #3 was never removed, it can only attach to the DS 2 ways, 180 degrees apart from each other.

But what do I know?

I'd go with what the ASE guy says!

Andy

 

[AndyR]

DOH!!! Never mind...

NOW I understand what yer sayin, Cahil

(I'm a little slow sometimes...)

I was thinking that the u-joints were removed...

I assume now that the DS was removed by unbolting #3 at both ends.

So yeah, 90 degrees makes sense now!

I think djanis99's advise is best: mark it, and put it back together the same way.

Andy

 

[84Bruiser]

I can't speak for anyone else... but my owners manual says not to exceed 45? 50? (Something like that) in 4wd.

Why push it?

Besides, if you can go 70, you can be in 2wd.

 

[cahilc]

Easiest thing to do is check the alignment of the end yokes on the driveshaft. They should be parallel to each other as in the picture. You get phasing when they are 90 degress out (I hope I'm right).



Cahil

 

[djanis99]

Alright guys, I went back to my textbooks and verified what I had said earlier about 180 degrees. here is what it says:

"Balance
--Driveshafts must be balanced
----Weights spot welded to the tube
-------When u-joint has failed suddenly have balance checked
--If driveshaft vibrates after installation remove and reinstall drive shaft 180 degrees"

This is courtesy of Universal Technical Institute. I remember my teacher mentioning this several times during lecture as well. I fortunately have never had this problem though.