Propeller Shaft

Submitted: Thursday, Mar 09, 2006 at 21:17
ThreadID: 31595 Views:1498 Replies:4 FollowUps:11
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Just had the Gearbox and Clutch done up recently ,when i went to grease the front Uni Joints i discovered that they have put the front Propeller shaft on backwards , I took it back and they it will be OK plus the fact because it's like that it will be less likely to get grit and grime in the sliding joint spline, anyone got a theory on that
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Reply By: Axle - Thursday, Mar 09, 2006 at 21:29

Thursday, Mar 09, 2006 at 21:29
Was it a imported mechanic that fitted it??.
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Follow Up By: Member - Doug T (QLD) - Thursday, Mar 09, 2006 at 21:34

Thursday, Mar 09, 2006 at 21:34
Naaa ....probably a backward one
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Follow Up By: Axle - Thursday, Mar 09, 2006 at 21:43

Thursday, Mar 09, 2006 at 21:43
HA HA HA! THURSDAY FUNNIE
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Reply By: Footloose - Thursday, Mar 09, 2006 at 21:42

Thursday, Mar 09, 2006 at 21:42
Now I'm not very mechanical but won't it have vibration problems if its in the opposite way ? Don't know why, just seem to remember reading something yonks ago.
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Follow Up By: Member - Doug T (QLD) - Thursday, Mar 09, 2006 at 21:43

Thursday, Mar 09, 2006 at 21:43
Have not experienced any and have now done about 4000 Ks
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Follow Up By: Member - Doug T (QLD) - Thursday, Mar 09, 2006 at 21:47

Thursday, Mar 09, 2006 at 21:47
I guess i could simply unbolt it and put it back on myself, Toyota put them on that way , must be a reason
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Follow Up By: Footloose - Thursday, Mar 09, 2006 at 21:48

Thursday, Mar 09, 2006 at 21:48
Ahh..ok. I must be confused with when its put in the right way but rotated 90deg. I thought there was a balance tag on them, maybe not. If it works why worry :)
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Follow Up By: Member - Doug T (QLD) - Thursday, Mar 09, 2006 at 21:52

Thursday, Mar 09, 2006 at 21:52
Yeh thats it...90deg , i sometimes don't explain things right ,,,umm front uni is now at the rear/..rear uni is now at the front ... errr ows that
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Follow Up By: Footloose - Thursday, Mar 09, 2006 at 22:07

Thursday, Mar 09, 2006 at 22:07
I can understand your unease. If Mr Yota put it on one way then there's probably a reason (and I'd love to hear it ). I guess 10mts with the socket set and you will feel better .
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Follow Up By: Member - Barry C (NT) - Thursday, Mar 09, 2006 at 23:54

Thursday, Mar 09, 2006 at 23:54
Many moons ago I worked on a fleet of FJ 40's and 45's and the acknowleged rule was ALWAYS fit drivelines as manufactured.
Can't remember the full story but out of balance and increased spline wear OR splines not sliding freely and therefore increased load on uni joints, come to mind. The spline wear was a subtle and insideous issue, as you find this out either too late (ie failure) or bad vibration that can come on very suddenly.

Seem to recall spline end always towards transmission/transfer case.

Barry
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Follow Up By: Member - Doug T (QLD) - Friday, Mar 10, 2006 at 00:22

Friday, Mar 10, 2006 at 00:22
OK Thats it , I am going to put it as it should be, Thanx all for the replies and good one Barry ..Thanks.
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Reply By: Richard Kovac - Friday, Mar 10, 2006 at 00:39

Friday, Mar 10, 2006 at 00:39
Doug
the reason the small end is fitted close to the g box is that if the drive shaft fails it wont come through the floor and rip your legs off.

Richard
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Follow Up By: Bilbo - Friday, Mar 10, 2006 at 01:23

Friday, Mar 10, 2006 at 01:23
Not quite sure I follow that Richard.

But think what happens if the front uni or the slide coupling fell apart at say 100 kmh.

The prop shaft drops into the bitumen, really digs into the bitumen, lifts the back end of vehicle about 2 metres in the air. Vehicle slams to a dead stop, then slams down into the bitumen and snaps yer neck with the whiplash,,,,,,,,,,,,

Scary things cars eh ;)

Still can't figure out why they would put a prop shaft on the opposite way to which it was originally fitted, I'd say someone stuffed up and they won't admit it. An apprentice perhaps??

The reason that the sliding joint is at the front is that there is far less radial movement i.e up and down movement at the gearbox end than there is at the rear axle end. That "up 'n down" movement would wear the splines far more quickly than if the splines were at the front, near the gearbox. The spline, if it were at the rear would suffering torque AND shear forces. It would break pretty quickly.

Watch what happens to the nose of a differentail housing when you accelerate from a standing start. It dips as the axle transmits forward motion to the vehicle chassis. That's where the spline arrangemnt would be worn out in no time. Whereas, the gearbox end hardly moves at all.

Wait fer the flack, Bilbo,,,,,,,,

Bilbo
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Follow Up By: V8Diesel - Friday, Mar 10, 2006 at 07:35

Friday, Mar 10, 2006 at 07:35
Richard and Bilbo make good points.

I know a bloke who snapped a front uni on a bombed HQ at high speed near Wikepin. The tailshaft acted as a pole vault and put him into the bush. Not good at all.

I had the rear uni joint bolts snap under full squirt from a standing start on my 360 Chrysler once and those tail shafts sure bounce around let me give you the tip.
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Reply By: hl - Friday, Mar 10, 2006 at 08:10

Friday, Mar 10, 2006 at 08:10
Hi,
Had the gearbox replaced in my GU a few months ago and the dealer also put in driveshaft back to front. It is still like it 10,000k later. Some people on other forums reckon it is not a problem. Some people do it to get more clearance over the crossmember in the patrol.
Cheers
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