Does this sound correct?

[allen_ajones]

I'd check the phasing as well. Not only in or out but also 180* out. It could be phased properly but at 180* out it might be out of balance.

so it's 180* phased out for the front and vice versa for the rear?

 

[landtank]

each driveshaft is made oup of 2 pieces, they slide together at the slip yoke. The 2 pieces can go together in multiple ways as there are quite a few splines in that yoke. If the driveshaft place took the two apart they could be only a single spline off or more. Phasing refers to how the two pieces line up. At each end of the shaft is a U-shaped piece which houses the cups to the u-Joint. When both of these ends face the same way they are said to be in phase, when they are perpendicular to each other they are said too be out of phase. At either position the shaft could be 180* out of position but still be aligned properly. It's important to not only have the phasing correct but also to match exactly how the shaft was balanced originally. On our shafts a quick check is to make sure the phasing is correct and that the zirks are all basically facing the same way.

 

[IdahoDoug]

Allen,

I'm a gonna ask this here question just one more time. Read it V-E-R-Y slowly so you can answer it (heh).

Ready? This is it, man - THE question. The root of it all. The diagnostic Holy Grail. (deep breath)


When did it start?






That's it.

DougM

 

[landtank]

Took it to a driveline shop. Said my front differential was going because of the whirl noise. He replaced the the rear DS U-joints and now I got a "rumble" noise that is just unacceptable.

Ok Doug, rub those eyes, take a sip of coffee and a deep relaxing breath and read this excerpt from his original post

 

[allen_ajones]

Well just to make sure. I take it back to the driveline shop today armed with this information, correct?

Check rear DS to make sure it is 180* IN PHASE


I cannot believe I pay good money to these monkeys and they don't know how to put something back together in a very specialized DRIVELINE SHOP (SAY IT SHOUTING like you just cannot believe...like in Glen Garry Glen Ross Movie)!!!!!!!!!!!!!!!!!

 

[allen_ajones]

AND BALANCE THE SHAFT!!!!!!!!!!!!!!!!!!!!!!


Don't driveline shops HAVE to do that automatically????????????????