P38 2.5 rubber coupling delete

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Joebur123

Joebur123

Member
Posts
27
Location
Hayling island
Hi all,
Wandering if it would be possible to pick your brains again.
I am looking into deleting the rubber coupler on the back of the transfer box, is it as simple as buying a yoke and propshaft from a petrol manual or is there more involved?
Vehicle is a '99 2.5 dse auto
Any help is much appreciated as always
 
Joebur123 said:
Hi all,
Wandering if it would be possible to pick your brains again.
I am looking into deleting the rubber coupler on the back of the transfer box, is it as simple as buying a yoke and propshaft from a petrol manual or is there more involved?
Vehicle is a '99 2.5 dse auto
Any help is much appreciated as always
Click to expand...

I know nothing about these things but I have to wonder why they went to the expense of a more complex prop. Presumably it makes moving off quieter and smoother but might it also prevent backlash being transferred into the gearbox? Admittedly the morse chain in the transfer box should absorb most of that but I wonder why it is on there? Many other cars also have the rubber too. What's the advantage of removing it?
 
@Grrrrrr
It was discussed in 1 of those other freds but it seems they only fit to the rear prop if i remember a comment in there:rolleyes: So no idea either:confused:.

J
 
Datatek said:
Removing the rubber shock absorber does not seem like a good idea to me, even my Transit has one.
Click to expand...
If something keeps failing then it needs to go in my eyes, all of the petrols and the manuals don't have it and there are plenty of them still going so it's obviously not that important. Just one more thing to go wrong
Although I appreciate it was probably there to take some vibration out of the diesel under acceleration
 
Grrrrrr said:
I know nothing about these things but I have to wonder why they went to the expense of a more complex prop. Presumably it makes moving off quieter and smoother but might it also prevent backlash being transferred into the gearbox? Admittedly the morse chain in the transfer box should absorb most of that but I wonder why it is on there? Many other cars also have the rubber too. What's the advantage of removing it?
Click to expand...
Less to go wrong and if its lifted on springs it will chew itself to bits
 
Joebur123 said:
If something keeps failing then it needs to go in my eyes, all of the petrols and the manuals don't have it and there are plenty of them still going so it's obviously not that important. Just one more thing to go wrong
Although I appreciate it was probably there to take some vibration out of the diesel under acceleration
Click to expand...

Petrol is smooth with little vibration from the engine. Manual diesel has a dual-mass flywheel to remove chatter before it gets to the gearbox, although you have to wonder how much gets past the torque converter.

Good point by Marjon: the front prop doesn't have one! Maybe that's because that gets some give through the viscous coupling?
 
Grrrrrr said:
Petrol is smooth with little vibration from the engine. Manual diesel has a dual-mass flywheel to remove chatter before it gets to the gearbox, although you have to wonder how much gets past the torque converter.

Good point by Marjon: the front prop doesn't have one! Maybe that's because that gets some give through the viscous coupling?
Click to expand...
The front prop is not driven by the viscous coupling.
 
Joebur123 said:
If something keeps failing then it needs to go in my eyes, all of the petrols and the manuals don't have it and there are plenty of them still going so it's obviously not that important. Just one more thing to go wrong
Although I appreciate it was probably there to take some vibration out of the diesel under acceleration
Click to expand...
I have 3 P38's one of which is scrap, none of them have suffered failure of the rubber coupling. However, if the car is lifted, then getting rid of it is probably necessary.
 
Datatek said:
I have 3 P38's one of which is scrap, none of them have suffered failure of the rubber coupling. However, if the car is lifted, then getting rid of it is probably necessary.
Click to expand...
The original one was knackered put a good quality new one on and the rubber separated from the metal bushings on that one within 2k miles and have just replaced it again last week and now just want to get rid of it to eliminate any other problems further down the road
 
Joebur123 said:
The original one was knackered put a good quality new one on and the rubber separated from the metal bushings on that one within 2k miles and have just replaced it again last week and now just want to get rid of it to eliminate any other problems further down the road
Click to expand...

I'm not sure how far you can lift it without issues. Brake flexis may need extending. I'm not sure about the props and how much angle they canntake plus the extra length before it causes issues.
 
Grrrrrr said:
I'm not sure how far you can lift it without issues. Brake flexis may need extending. I'm not sure about the props and how much angle they canntake plus the extra length before it causes issues.
Click to expand...
Well my theory is that I'm not going any higher than the car could go on air when in extended height so I'm hoping I shouldn't run into too many problems
 
Joebur123 said:
Well my theory is that I'm not going any higher than the car could go on air when in extended height so I'm hoping I shouldn't run into too many problems
Click to expand...

There is that but remember stock car won't go over 35mph at that height. Partly to stop it toppling over but might also be strain on the yokes. I don't know enough about it to say if it will be an issue or not.
 
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