Thread: Thicker rear diff crown wheel on T/C puma?

Hi Nando,
So a thicker CW means you'll be getting the HD axles? What's the point in getting a bullet proof diff and still have a weak point in the axles.

Hi Marty,

That was my thinking.

Until he looked up my model he was adamant that i should keep the standard axles. His theroy was that its a lot easier in the bush to rip out a busted axle and still be able to limp to somewhere for help as opposed to busting the crown and potentially being stuck with a busted rear diff.......this theroy does make sense but i wanted things to be as strong as possible.

Originally Posted by 1nando

Hi Marty,

That was my thinking.

Until he looked up my model he was adamant that i should keep the standard axles. His theroy was that its a lot easier in the bush to rip out a busted axle and still be able to limp to somewhere for help as opposed to busting the crown and potentially being stuck with a busted rear diff.......this theroy does make sense but i wanted things to be as strong as possible.

In a deefer if you break a c/w just rip the axles out and drop the t/shaft off you go .
By the way id do axles if your upgrading the centre to a locker . This theory of having a fuse in my opinion is flawed when all we want is a stronger diff axle combo setup . Whats the point if you only half do a job
Sorry plenty of standard c/w and pinion`s with lockers and axles out there in realy tuff rovers
I for one have and do run lockers with heavy duty axles and standard c/w and pinion`s. I have never had a problem if the diff is set up right . Mechanical sympathy is your best friend. Im thinking who ever you have chosen to do the job is not the right person sorry for such a job .

Hi Rangieman,

I am doing the axles.

He didnt want me to at first and then confirmed that mine had the thicker crown wheel and said it would be fine.....

Im just finding it hard to believe that the pumas came out with different thicknesses of crown wheel's

I have read that when an axle snaps at the detroit end it can take out the detroit therefore everyone upgrades there axles.
I'd doubt landrover would have 2 different thickness crownwheels as a factory option in the puma!
They do have p38 type and normal rover type.

I reckon it makes sense to have a designed weak point. Its really no different to a shear pin in a piece of machinery to protect expensive, more difficult to replace parts.

The drive flanges would be the ideal 'shear pin' in this case, nice and easy to replace, small enough to carry spares etc.

Originally Posted by Beery

I reckon it makes sense to have a designed weak point. Its really no different to a shear pin in a piece of machinery to protect expensive, more difficult to replace parts.

The drive flanges would be the ideal 'shear pin' in this case, nice and easy to replace, small enough to carry spares etc.

Naa, bugger that, I'd much rather have everything engineered and built so I never exceeded the fatigue and failure limits with what I do.

FWIW KAM make two piece CV's and front stub axles with a machined groove to do what you suggest for comp vehicles where it is easy to exceed design limits.

Originally Posted by rick130

Naa, bugger that, I'd much rather have everything engineered and built so I never exceeded the fatigue and failure limits with what I do.

FWIW KAM make two piece CV's and front stub axles with a machined groove to do what you suggest for comp vehicles where it is easy to exceed design limits.

Yeah fair point. You'd have to spend some serious money on the drivetrain though, probably not an option for many people who might only one day be unlucky enough to over stress the driveline.
That said, I'm considering 3 x Ashcroft ATB's this year haha