Prop Shaft Direction.

TVRleigh · Post by **TVRleigh** » Wed Jan 30, 2008 3:28 pm

Does it matter when end the telecopic bit goes, does it have to be at the gear box end or can it go at the diff end.

Thanks
Leigh

Post by **katanaman** » Wed Jan 30, 2008 3:45 pm

The sliding part is usually at the gearbox.

TVRleigh · Post by **TVRleigh** » Wed Jan 30, 2008 3:53 pm

I know it normaly is but is there a reason.

As don't want to take my diff out to fit the prop.

but If I take the end off I can fit in reverse.

ChrisJC · Post by **ChrisJC** » Wed Jan 30, 2008 4:01 pm

Don't know why that is though.......? I wouldn't have thought it mattered.

Chris.

ian.stewart · Post by **ian.stewart** » Wed Jan 30, 2008 4:16 pm

The question has to be asked what is the problem with fitting the prop around the correct way????? is it you can not get the prop in because its too long??

TVRleigh · Post by **TVRleigh** » Wed Jan 30, 2008 5:05 pm

The car has a welded in prop guard, as the body is GRP so not a lot of protection, if it comes loose / Breaks.

and the flangies are too big to fit past the guard.

but if I take the sliding end off I can then pass the prop though, then re-attach the sliding end.

but there no room to do this the other way round.

hence asking if it matters.

Thanks again
Leigh

Post by **katanaman** » Wed Jan 30, 2008 5:23 pm

No idea why but that's the way they are so there is probably a reason. If your prop is new then maybe it wont matter if its used then possibly not a good idea as it will be worn in one direction and you have just reversed it. This could result in rapid wear but its up to you in the end.

TVRleigh · Post by **TVRleigh** » Wed Jan 30, 2008 6:00 pm

katanaman wrote:No idea why but that's the way they are so there is probably a reason. If your prop is new then maybe it wont matter if its used then possibly not a good idea as it will be worn in one direction and you have just reversed it. This could result in rapid wear but its up to you in the end.

Well it getting up-rated Racing racing UJ's and it's going in a different car, so don't think there will be a wear problem,

only think I could think of they would be less stress on the gearbox, as it would have less mass to move, when you get movement.

It's not going to get a lot of use, but when it does it will be hammered.

Thanks for all you help
Leigh.

JC. · Post by **JC.** » Wed Jan 30, 2008 6:52 pm

My MGB had a welded in prop guard.
I cut it off with a grinder and now have a bolt on version.

mgbv8 · Post by **mgbv8** » Wed Jan 30, 2008 7:42 pm

I thought the telescopic bit was fitted towards the gearbox to keep it dry as its tucked away in the tunnel more often than not.

Post by **Coops** » Wed Jan 30, 2008 8:24 pm

on my car its at the rear,
i have a two piece prop which is fixed by a bearing in the middle, so the front will never move, the telescopic bit is then mated up to the other side of the bearing and then goes to the diff,

New one is closest in photo.

CastleMGBV8 · Post by **CastleMGBV8** » Thu Jan 31, 2008 8:22 pm

I also have a feeling that there's a good reason it has to go on the the front end. If I eas you I'd check with one of the prop shaft manufacturers such as Hardy Spicer or GKN?

The one shown above is still after a fixed bearing and a long way from the axle so is ok.

Kevin.

ian.stewart · Post by **ian.stewart** » Thu Jan 31, 2008 9:04 pm

CastleMGBV8 wrote:I also have a feeling that there's a good reason it has to go on the the front end. If I eas you I'd check with one of the prop shaft manufacturers such as Hardy Spicer or GKN?

The one shown above is still after a fixed bearing and a long way from the axle so is ok.

Kevin.

Something in the back of my engineering background says its wrong, dont know what or why, but I have that gut feeling.

HairbearTE · Post by **HairbearTE** » Fri Feb 01, 2008 9:06 pm

It's probably to do with vibration in the drivetrain. Putting the sliding section at the front of the shaft will allow for some for/aft movement of the engine & box without subjecting the additional mass of the propshaft to the same vibration. Wear on internal gearbox and engine parts could be accelerated by hanging a heavy, virating propshaft to them. That would be my theory, but is is just a guess..

ozrover · Post by **ozrover** » Sat Feb 02, 2008 9:38 am

Some shafts are mounted the other way i.e the sliding section at the diff.Grand Cherokee 5.7L Hemi's have a front shaft which uses a double cardan joint at the center and a sliding joint with cv at the diff A lot of 4x4 shafts have sliding joints in the middle of the shaft,some it the diff end and some at the output shaft end.Give it a go ,if it vibrates simply pull it out and put it the other way.
Doug