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Rear Prop Shaft Modification

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31 Oct 2013 11:55 #88726 by KJS
Have had a few problems with vibrations and worn joints on my 2006 Jim. So l made a phone call to Dave Mac props and spoke with Keith. As people know the front sliding cv joint on the prop is not a serviceable item, so in discussion it was decided to modify this to a u/j set up. All the new joints including the spline are able to be greased,
and the 2 u/j's are renewable. Received the finished article this morning and very pleased.





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31 Oct 2013 12:41 #88733 by gus2000
Replied by gus2000 on topic Rear Prop Shaft Modification
According understand a CV joint needs to be replaced by a double-cardan u-joint





from www.twistedandes.com/foro/showthread.php?t=44143

cheers

gustavo

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01 Nov 2013 10:05 #88863 by KJS
Replied by KJS on topic Rear Prop Shaft Modification
Hi Gustav, do you know the reasons why? When measured mine has more movement allowing for more articulation than the standard prop. My Jim is in standard trim with only 75 profile tyres fitted. I have run this on road and off road at the farm with no problems.

Keith

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01 Nov 2013 12:05 #88877 by facade
Replied by facade on topic Rear Prop Shaft Modification
Take a look at

en.wikipedia.org/wiki/Constant-velocity_joint

for the reasons why.

A shaft with a UJ at each end will be fine (it is actually a double cardan shaft, but the problem is the two ends don't usually have the same angle from the main shaft), it will tend to rob power, and vibrate at large angles though, but likely you wont notice off road.

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)

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01 Nov 2013 12:27 #88878 by KJS
Replied by KJS on topic Rear Prop Shaft Modification
Thanks for the link, it is one l looked at before embarking on the mod. Have to say at the moment there doesn't seem to be any loss of power or vibrations, certainly a lot better than the old original. It will be interesting to see how it continues to perform over time.

Keith

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01 Nov 2013 22:59 #88974 by gus2000
Replied by gus2000 on topic Rear Prop Shaft Modification

KJS wrote: Hi Gustav, do you know the reasons why? When measured mine has more movement allowing for more articulation than the standard prop. My Jim is in standard trim with only 75 profile tyres fitted. I have run this on road and off road at the farm with no problems.

Keith


Thanks facade for that interesting link

I contribute another

www.pirate4x4.com/tech/billavista/PR-shaft/index2.html

cheers

Gustavo

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