View Full Version : Front drive shaft


mayordaily
06-18-2009, 08:04 AM
I'm looking to replace the front drive shaft on my 2002 Disco and am wondering if I need to also replace the centering ball unit.? Are there any other components that I need to look at?

joey
06-18-2009, 12:09 PM
Not sure what you mean by the centering ball unit....

Driveshaft you can just replace the U-joints, unless you goal is to get a better setup.

mayordaily
06-18-2009, 12:26 PM
Hi Joey,
In my rush to post my question I failed to state I was looking to "rebuild" the front shaft. I read somewhere that in addition to purchasing u-joints it's recommended to also pick up a centering ball kit??? I had assumed that the u-joint is a complete unit. In addition to the u-joint, are there any other parts you recommend that I swap when working on the shaft? My mounting collars are rusty but seem solid. Thanks for the quick response to my original posting!

joey
06-18-2009, 04:48 PM
I would think the U-joints should do the job.

chris02disco
06-19-2009, 02:00 AM
Hello
I just rebuilt my front prop shaft a few months ago. I would recommend getting the "center ball kit". I didn't and it was a pain to get it back together and lined up correctly. I may have to replace mine eventually because the rubber cover was starting to crack. I guess it is just another thing that I have to keep an eye on. Remember if you replace your u joints with greasable ones grease them at every oil change. Hope this helps.

antichrist
06-19-2009, 09:53 AM
Absolutely replace the centering ball as well.
If you have a place like Advance Auto Parts near you you can get PDQ 10005 u-joint which is in reality a reboxed Neapco u-joint, cost is about $14 each. If you can't find PDQ then the Neapco same PN will run you $25-$30.
Centering kit PN is Neapco 7-0081NG.

mayordaily
06-19-2009, 12:12 PM
Thanks for all the input!

Disco Mike
06-21-2009, 10:06 AM
You absolutely have to replace the centering ball kit or your shaft will fail in short order.

tempestv8
06-21-2009, 11:15 PM
I think it really depends on how bad the Unis in the Hookes Joint have degraded to. Sometimes it's OK just to replace the two unis if the center ball joint is still OK.

antichrist
06-21-2009, 11:25 PM
Yeah, but why bother? You're 3/4 of the way there to replace the centering ball when you have both u-joints out. Yes, if you're doing it out on a trail, but in your garage, or a shop, it's silly not to.

tempestv8
06-21-2009, 11:33 PM
Fair comment, Tom.

I actually don't do the work myself, but simply take the propshaft to a driveshaft specialist and they tell me what needs to be done to it. :cool:

On two occasions, they did replace the center ball joint because it was cactus, but on one particular shaft they said it was OK just to do the unis.

I've swapped out so many propshafts for friends' Discovery IIs that it really makes me wonder why Land Rover didn't use greasable uni joints. I've seen a Hookes Joint for a Japanese 4x4 which has zerk fittings for the center ball joint, and the two unis. If only LR had used that design.... :albertein

Lawrance Lee

chris02disco
06-22-2009, 01:09 AM
Ok, I am no driveline specialist so I need some help. Can anyone tell me what to look for to tell if the "center ball" is bad? I rebuilt my front propshaft a few months ago withotu changing it. Haven't noticed any problem or vibes in about 800 miles, but if the shaft will definitely fail I don't want to take a chance. This is the wife's daily driver and if something major happened she would demand to sell! I love this truck (when I get to drive it) and have no problem going under her again to fix her right. Any ideas or input?

P.S. Welcome Disco Mike, good to see your knowledge on this forum too!!

antichrist
06-22-2009, 08:06 AM
You can lube the center ball with a syringe type grease needle. There's a tiny hole in the housing it will fit in.

Disco Mike
06-22-2009, 01:02 PM
I think it really depends on how bad the Unis in the Hookes Joint have degraded to. Sometimes it's OK just to replace the two unis if the center ball joint is still OK.

The going price for a tranny and or t/case replacement is in the $4000 to $5000 range and you want to tell someone it might be OK, not very sound advice. For $38 a new centering ball will make sure both new u-joints are aligned perfectically.

chris02disco
06-22-2009, 05:25 PM
Thanks for the input.
Looks like I am going back in. Now that I have a better idea of what I am doing, it shouldn't be very difficult to change the "center ball". I believe that the propshaft still has the alignment marks from before. It not really work when you enjoy the learning!!

Disco Mike
06-22-2009, 07:56 PM
Ok, I am no driveline specialist so I need some help. Can anyone tell me what to look for to tell if the "center ball" is bad? I rebuilt my front propshaft a few months ago withotu changing it. Haven't noticed any problem or vibes in about 800 miles, but if the shaft will definitely fail I don't want to take a chance. This is the wife's daily driver and if something major happened she would demand to sell! I love this truck (when I get to drive it) and have no problem going under her again to fix her right. Any ideas or input?

P.S. Welcome Disco Mike, good to see your knowledge on this forum too!!

Hate to tell you, but odds are without having changing the center ball, your shaft will fail again, sooner then later.

Disco Mike
06-22-2009, 07:57 PM
You can lube the center ball with a syringe type grease needle. There's a tiny hole in the housing it will fit in.

If it has never been lubed in the past, there will be a wear pattern the the new u-joints won't be able to fit with and BOOM>

antichrist
06-23-2009, 10:52 AM
I believe that the propshaft still has the alignment marks from before.Make your alignment marks with a center punch and they will always be there.

If it has never been lubed in the past, there will be a wear pattern the the new u-joints won't be able to fit with and BOOM>I was talking about once it's been replaced. Even though the Disco type CV head doesn't have a grease fitting, you can get grease in to the center ball.

chris02disco
06-23-2009, 10:17 PM
Make your alignment marks with a center punch and they will always be there.

I just used a dremel to eche some arrows on both sides. I didn't really want to pound on the shaft for fear of unbalancing it. I am not sure how sensitive it really is?? Just looked under the truck again today and I still can see them. BTW who makes a good center ball kit? I haven't really researched local parts stores yet, but I may have to order one. Any ideas? Thanks

antichrist
06-24-2009, 12:42 PM
I just used a dremel to eche some arrows on both sides. I didn't really want to pound on the shaft for fear of unbalancing it. I am not sure how sensitive it really is?? Just looked under the truck again today and I still can see them.A dremel works too. A good sharp center punch will mark it without much force and not unbalance it. In fact a acceptable way of removing the u-joints is to remove the circlip and whack the yoke with a hammer, preferably brass.
BTW who makes a good center ball kit? I haven't really researched local parts stores yet, but I may have to order one. Any ideas? Thankshttp://www.*******************/forums/279165-post13.html

chris02disco
06-24-2009, 10:47 PM
A dremel works too. A good sharp center punch will mark it without much force and not unbalance it. In fact a acceptable way of removing the u-joints is to remove the circlip and whack the yoke with a hammer, preferably brass.
http://www.*******************/forums/279165-post13.html

Thanks for taking the time to share the link and the good info.

sine mora
01-09-2010, 01:20 PM
deleted by user