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  #1  
Old August 10th, 2011, 06:20 PM
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Gardner Congdon
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gut check

Aside from the disintegrated shock mount (replaced- left side, mid way through a cross country trip), disintegrated anti-roll bar mounts, and disintegrating spring mounts, my rear axle case is now leaking gear oil from what appears to be a poor weld at the differential cover to axle. I'm leaning towards just replacing the whole assembly with one from a '98 Disco LE. That's a straight swap, right? (I've already got rear disc brakes).

As an aside, I checked the gear oil level when I noticed the leak and gear oil POURED out of the upper plug. I always assumed you filled to this level. I imagine you could over fill by jacking up one side of the axle, but is this done commonly??

Thanks!
-Gardner
Seattle
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  #2  
Old August 10th, 2011, 06:48 PM
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William Skidmore
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Might have filled by the pinion. I know on some series axles that there is an extra fill plug on top and to the rear of the diff cover/front.
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Old August 10th, 2011, 08:01 PM
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Kevin Buckley
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I replaced my rear axle housing with a disco 1 unit, no problem at all.
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  #4  
Old August 10th, 2011, 08:11 PM
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Neill Thornton
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My '84 has Disco axles front and rear... no issues.
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  #5  
Old August 10th, 2011, 09:08 PM
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Mike Hammond
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Quote:
Originally Posted by Gardner View Post
As an aside, I checked the gear oil level when I noticed the leak and gear oil POURED out of the upper plug. I always assumed you filled to this level. I imagine you could over fill by jacking up one side of the axle, but is this done commonly??

Thanks!
-Gardner
Seattle
By gear box are you talking about the transfer box or the main gearbox?
Over filling the main gearbox can lead to an oil leak sending oil down the input shaft and straight onto the clutch. This will cause an alarming degree of clutch slip on a steep hill and can be easily cured by putting the right amount of oil in i.e up to the filler plug. Been there, overfilled it, had the slipping clutch, and reduced the oil to the correct level.
Overfilling the transfer box is not such a problem except if the out put seals are suspect then oil will drip.
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  #6  
Old August 11th, 2011, 01:15 AM
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Gardner Congdon
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gut check

Thanks all- will proceed with acquiring the Disco axle case. The gear oil question was just specific to the rear diff. I've only ever seen an issue with overfiling one where it got hot and blew all the excess oil out the breather (not a Rover). Considering my Defender made it cross country on my checkout drive, I figured it wasn't harming anything- just curious if this was something commonly done for some reason.
Thanks again.
-Gardner
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  #7  
Old August 11th, 2011, 01:24 AM
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Could have gotten water in it.

Ron
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  #8  
Old August 12th, 2011, 01:27 AM
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Gardner Congdon
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water

Yeah, I thought about that, but I haven't been wading anywhere. We'll see when it gets torn into I guess. Thanks again for all the help everyone.
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  #9  
Old August 12th, 2011, 10:15 AM
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Quote:
Originally Posted by Gardner View Post
I've only ever seen an issue with overfiling one where it got hot and blew all the excess oil out the breather (not a Rover).
-Gardner
On a Rover it'll blow the oil out all over the brakes if the breather is blocked more-or-less regardless of the oil level.
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  #10  
Old August 15th, 2011, 06:57 PM
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Gardner Congdon
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axle... case.. gearing...

So, I found a complete rear end from a Disco I for $250. Is the stock Disco rear differential gearing the same as the Defender? Is there an easy way to check differential gearing in my Defeder vs what I just purchased? I'm thinking of swapping the complete unit instead of just the case.
Many thanks.
-Gardner
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  #11  
Old August 15th, 2011, 08:36 PM
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Mike Hammond
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Quote:
Originally Posted by Gardner View Post
So, I found a complete rear end from a Disco I for $250. Is the stock Disco rear differential gearing the same as the Defender? Is there an easy way to check differential gearing in my Defeder vs what I just purchased? I'm thinking of swapping the complete unit instead of just the case.
Many thanks.
-Gardner
You can jack one side up turn the road wheel one turn and count how many turns the differential input makes then do the same for the "new" axle.
They should be the same and the entire axle is a direct swap. Been there, done that, big improvement over drum brakes
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  #12  
Old August 16th, 2011, 01:07 AM
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Gardner Congdon
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diff ratio

Thanks Mike. I did some searching and it looks to be the same ratio assuming the PO didn't change what's there. I'll do the test you recommended.
-Gardner
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  #13  
Old August 16th, 2011, 01:20 AM
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Mike Hammond
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I just disconnected at the flexible brake hose and it rolled straight in.
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  #14  
Old August 16th, 2011, 12:55 PM
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Gardner Congdon
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Cool. Sort of looking forward to this. Every bump I hit I wonder if my rear springs are going to go flying off- there's about a tin can's worth of steel left on the mounts on the axle.
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