how can i make sure my drive axle is in phase ?

[mazdamama]

i just took out my front axleshafts to redo my balljoints, and i know the passenger side is in phase but how do i make sure the driverside stubshaft is in phase. i tried lining it up with the pasengerside axleshafts, but im not sure if its the right way, because when i spin the driverside axle shaft , the passenger axleshaft turns the opposite direction.

 

[Hahnsb2]

There is only 1 joint on the drivers shaft, it doesn't need to be in phase with anything.

 

[BRUTUS_T_HOG]

cv joints don't need to be in phase.

the driveshaft from trans to axle needs to be phased to reduce vibrations, and is usually not adjustable except with shims

 

[mazdamama]

yeah thats kinda the conclusioin i was coming to, thanks for the reasurance guys

 

[AllanD]

"In phase" refers to the driveshaft "Ears" on either side of a slip yoke.

On a driveshaft ot axle that has a splined section that cn be assembled and doesn't havea "blind spline" to prevent mis-assembly you must make sure that the ears on either end of the shaft line up.

Loop-to-loop

a 1994 doesn't have CV joints in the axles.

No ranger made before 1998 does

AD

 

[BRUTUS_T_HOG]

"In phase" refers to the driveshaft "Ears" on either side of a slip yoke.

On a driveshaft ot axle that has a splined section that cn be assembled and doesn't havea "blind spline" to prevent mis-assembly you must make sure that the ears on either end of the shaft line up.

Loop-to-loop

a 1994 doesn't have CV joints in the axles.

No ranger made before 1998 does

AD

im sorry, but that is not what being in phase means.

it refers to the angle that the axle is positioned on the leaf springs, as in the pinion pointing up or down.


a behavior of a u joint is that the "output" speed is not the same as the "input" speed, this creates stresses and vibrations

to be in phase is just to have the axle pinion pointing at the "right" angle so the u-joints cancell each others speed variations out.

unlike a CV joint which always has the same input and output speed, hence the name...Constant Velocity joint

 

[LittleHorse]

no, no, no, no, no. Being in phase is exactly what Allan said - the ears of the u-joints lining up correctly. I've experienced it first-hand, on a Suzuki Samurai that had been sprung-over and the person doing the work didn't put the driveshaft back together in phase.

You're talking about the pinion angle.

Either one, if not set properly, can cause vibration.

There's a reason AllanD is the "RBV Technical Advisor". It's because he knows everything.

Read this:
http://www.pirate4x4.com/tech/billavista/PR-shaft/index2.html

 

[BRUTUS_T_HOG]

what was i thiking of then lol..

 

[LittleHorse]

what was i thiking of then lol..

lol, what you were talking about is just as important. You can phase your driveshaft however you want but if the pinion angle isn't right it's going to shake like crazy.

I'm in the middle of the information-gathering process for upgrading the tulip-joint driveshaft on my '90 Bronco II. There's so much info around here sometimes it's hard to find specifics.

 

[AllanD]

what was i thiking of then lol..

Actually what you were thinking of is "phase angle" which is something related
but different.

The ears must be aligned or you create a situation where the non-constant speed of a rotating simple u-joint on rigidly coupled to another identical u-joint... how to phrase this... the velocity differences will "add up" rather than cancel each other out... you want to experience vibration?

Driving by a no-tell motel will shake people off their magic fingers
vibrating beds

the ANGLE at either end of the driveshaft is also critical because the angle determines the amplitude of the velocity non-constancy and again if the angle is not equal you create a differential, thus a vibration.

there is little that operates vibration free, but most of the time you
can get the vibration into an amplitude/frequenct combination where
you cannot perceive it OR you can intentionall create anothe rvibration with the same frequency and amplitude but reversed "in phase" to cancel the first one out.


AD

 

[BRUTUS_T_HOG]

lol you want vibration? try some heavy towing with a divorced transfer case on old bushings

 

[pdmustgt]

There are some vehicles that the driveshaft is slightly out of phase to counter act a vibration this is very rare to see. Most who do see it think the factroy screwed up.