Prop shaft unis phasing question.

[up2nogood]

The rear prop shaft on my two Discoveries are in line.

The odd bit is the front prop shafts (in both cars) are out of phase one or two splines.

Are the front shafts out of whack? Or is this a Land Rover oddity?

[chimpboy]

They should definitely not be out of phase. They need to be parallel for the two universal joints to compensate each other - universal joints turn faster/slower at different points in their rotation.

Good writeup here: http://www.pirate4x4.com/tech/billavist ... ndex2.html

Jason

[up2nogood]

That's what I thought, but it's odd for both Disco's to be out on the front shafts.

Thanks for that!

[chimpboy]

Well, it IS weird if both are out of phase the same way. So maybe a LR guru can shed light on it, but it doesn't make any sense to me, I would expect it to give a vibration kind of feel to the front when 4WD is engaged.

[bazooked]

all the rangies, discos, are out of phase on the front shaft its how the come out from factory, if u put them in line they will vibrate,.

[chimpboy]

That's pretty weird... is there another u-joint somewhere in the system we don't know about?

[up2nogood]

Nope. Funny that they vibrate if aligned.....

With a 2" lift they vibrate anyway. At least they do with the shafts the way they are in my cars.

I wonder if the world will end if I align them? Anyone know if Range Rovers are out of phase or if any other make is set up out of phase from factory?

[christover1]

Maybe the shafts don't run in line with the drive, ie more than 1 angle from out put to diff input?
This may be a reason to run out of phase.
Just a wild slightly educated guess

[up2nogood]

Probably a correct guess!

So all Rovers are out of phase.

Buggers!

[ISUZUROVER]

Yep, you are right Christover - the nose of the front diff points at the transfer case (0deg angle). So installing the propshaft unis out of phase solves any vibration problems from the diff angle.

[Reddo]

whaat......

I can't agree, our D1 has them in phase - as they are/were on the vehicle as bought....and even with 2' sping lift and 2.5" body lift there's no bad vibes.

I ascertained some time ago that LR only odd-phased UJs on some Rangie models and even then no-one knows why. Put them in-phase as they should be so that any vibes cancel out and see what happen. I can assure you we have ours in phase and there are no issues concerning bad vibes.....

Check to see if other issues are causing the probs...

[frp88]

When i was working for driveline services meny a moons ago we did the army landys they were all in phase even the 6 wheel drives with the short diff shaft.

[rvh96]

they are set out of phase to compensate for the different angle between the unis,landrover tried it first on the defenders several other manufacturers have tried this as well ,holden for one on commodore vl to vt, doesnt really work that well though it only changes the speed of the harmonic shift, slower if you advance the unis faster if you retaird so they advance as the vib is less noticable at low speed and less stress on driveline

[J Top]

The discos are also plastic coated on the splines and don't go together in any but the factory phase nicely as they tend to bind
J Top

[Hekta]

Good writeup here:

BillaVista is teh at tech articles

[J Top]

this is interesting
http://cvcoupling.com/

[rick130]

out of RAVE

The front shaft which is shorter than the rear is
’phased’, with the joints at each end, A and B
mis-aligned as shown.
The phasing is necessary on the front shaft only to
allow for greater variation in angular changes.