Land Rover Diffs

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Originally Posted by uninformed

so a larger Dia will transition the forces more smoothly? Are the Nissan OEM axles waisted etc? Are there any specs for force breaking like Ashcroft spec for their shafts?

Yes Nissan are stronger, yes LR diffs are undersized and should have been upgraded years ago.....but then the list only starts there right. BTW the Sals is a good diff, but It would not be my first choice....If I had the choice

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The diameter I don't think affects the transition of the forces. I think it has more to do with changes in diameter and how it is done along the length and in relation to the splines.

Both axles are full floating and I can only assume that both share similar engineering design. ie decent design re wasting to the root of the splines etc.

By my calculations (which may be wrong :D) with hytuf axles at 1517Mpa UTS min and yield 184000lb (apologies for using mixed measurements - just the data I had + conversions) a 1.24" Rover axle would break at no less than 5740ft/lb (7782Nm) and a 1.5" Nissan axle from the same material (I have no idea what its made from) would break at no less than 10161ft/lb (13777Nm)

Engineers: Tmaxlb/in = ((pi//16)xyieldxD^3)/12 then convert back to metric - sorry!

So despite my tongue in cheek comment that the Nissan is twice as strong, the axles wont actually be too far off that, 1.77x stronger standard for standard.

All good, but I seriously doubt a OEM Nissan axle to be made from AMS 1684 ;)

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Originally Posted by uninformed

All good, but I seriously doubt a OEM Nissan axle to be made from AMS 1684 ;)

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As I said, standard for standard. ;)

Slunnie, that is incorrect from memory. The patrol axles are semi floating.

Some one mentioned that the axle diameter on the rover is thin, most modern 4x4's are running semi floating axles so are inherently a little larger diameter as they are under more stress'

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Originally Posted by lambrover

Slunnie, that is incorrect from memory. The patrol axles are semi floating.

Some one mentioned that the axle diameter on the rover is thin, most modern 4x4's are running semi floating axles so are inherently a little larger diameter as they are under more stress'

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These were calculated on the Patrol big diff that comes under the Leaf utes - full float 1.5", the wagons and coil utes have the regular diff which is about 1.31" semi-floats. Not accounting for concurrent forces the 1.31" with the same material would come up at about 6768ft/lb which is about 1.18x stronger than Rover standard for standard materials.

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Originally Posted by Slunnie

As I said, standard for standard. ;)

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Sorry slunnie, must be the way I'm reading it....post #16 I thought you were saying stock big Nissan rear Vs sals MD 24 spline. Also confused by you saying size doesn't matter but quoting sizes and using dia to calculate strength...:confused:

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Originally Posted by uninformed

Sorry slunnie, must be the way I'm reading it....post #16 I thought you were saying stock big Nissan rear Vs sals MD 24 spline. Also confused by you saying size doesn't matter but quoting sizes and using dia to calculate strength...:confused:

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Sorry Serg, you are correct. I'd never calculated the strength between the 2 and it was more of a figurative comment rather than an actual comment at that point (ie Post #16).

Size does matter for the strength, but not how smoothly the force acts on the shaft. For the forces to be smooth (I'm assuming we're talking about stress raisers here) then the diameter of the shaft would be the root diameter of the splines for the whole length and the shaft would be polished so when torque is applied the shaft flexs evenly along the whole shaft.

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Originally Posted by uninformed

are they 35 spline? rather a moot point as spines can be different designs/profiles so its the root dia that counts....I cant see the 1.5inch nissan having double the cross sectional area of the 24 spline rover, and ontop of that is the Nissan OEM as good as a design and material as a MD/Hi-Tough?

hey I know which is better stock, but lets keep it real ;)

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Serg - the bottom line is that the H260 rear is what LR should have used. About the same CW diameter as a sals, but with a welded case so better clearance. And 1.5" 37(?) spline axles. Sure it is semi-floating, but you can run 40" wheels without breaking anything!!!

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Originally Posted by uninformed

is the H260 the leaf sprung version? If so not as many of these being punished as the coil verisons....yep the coil versions have been brakeing stuff, I guess thats why there is aftermarket stuff available. Id say search Outerlimits, but it seems down for the count :confused:

yes Maxi stuff has and will break, it was never ment for 35's...Mal designed all this stuff before even 33s where popular. They have proven themselves more than adequate, even when pushed in competetion....all this is however niether here or there. I simply questioned the statement of "Double" the strength. Posible yes, but Id like to see the tech.

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H260 comes in some coil wagons, I don't need to search the Internet, I used to spend lots of time out breaking things with people, in real life

I'm not concerned on the theory myself, I don't see the sense on squabbling over an exact torque figure as to which each breaks, I mean someone says twice as strong and you want figures, pretty sure it was just a term to say they are stronger, not a scientific study

Semantics

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Originally Posted by isuzurover

Serg - the bottom line is that the H260 rear is what LR should have used. About the same CW diameter as a sals, but with a welded case so better clearance. And 1.5" 37(?) spline axles. Sure it is semi-floating, but you can run 40" wheels without breaking anything!!!

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I thought the H260 were all full float. Just did a Google search and they came out as full and semi-floater diffs.

Edit: Serg, it seems that turned up everywhere. MQ/MK, Leaf utes as full floaters, Some wagons as semi floaters etc.