Thread: Life of Puma Rear Diff's

Originally Posted by clubagreenie

So it looks a great quality casting. Will it fit other model housings? (D1-2/RRC/series?).

Apart from rear cover clearance (and bolt pattern plus other I haven't thought of) is there a reason it couldn't be turned "upside down" to be a hi pinion?

I'm not sure if they need to be setup to properly lubricate the pinion bearings, but otherwise the diff would rotate backwards. CW slot is also in the wrong spot.

Hi there,we have a clunk in rear diff wich i first noticed with about 11000km on it, out of warranty ,have been to transmision specialist,they said its normal,went to landrover specialist and they took it for drive,checked it out and said it is the axles/splines etc that make it clunk,about a grand to put hd axles etc into it.it has only 17000km on it now,will get that fitted soon,hopefully will fix it!

Originally Posted by Slunnie

Just as I think it through, it really sounds like its going to be an excellent diff, like really strong compared to Rover and beyond that of those Toy 8" conversions too.

If you don't mind me asking:

Is this setup that you're developing able to be used in front applications, so provides clearance for the tie rod also or has it been designed as purely a HD rear diff option?

You were saying previously that it accepts other Rover type hemispheres - eg old style ARB, Maxi etc with holes drilled out to a larger dia.

Does the pinion use Rover 4 bolt or 3 bolt flanges.

Which ratios do you expect to be available?

Is this something suitable for upgrading half shafts to Toy 30 spline, D60 35 spline if clearance etc?

Is it suitable for Rover housings also or only P38 type?

Sorry for all of the questions, I just think this is such a great development for LandRovers.

Hi Slunnie,

It has just been designed for the 110 rear, P38/Wolfe type housing so will not fit the front,

Yes you can fit any rover type diff if you drill out the crown wheel holes for the bigger bolts,

I guess you can fit the 3 or 4 bolt flange but you would only want the 3 bolt in a disco which it will not fit as discos have the rover diff not the P38 type,

Ratio is 3.54 but not with the rover count of 46/13, we are using 39/11,

You may get the toy 30 spline in but not the 35 spline as its still a rover centre and these will not go that big,

Just the P38 housing,

The issue with designing something like this is deciding where to draw the line, all the options you mentioned had to weighed up,

P38 or rover or both ?
Stock 24 spline or bigger ?
Existing locker or custom ?

We didn't want to reinvent the force 9 axle, there is little point in making it fit the front as the overall axle will not be stronger as you have the 24 spline shafts and you have clearance issues with the track rod and it may be vulnerable being a low pin,

It made sense to use our existing air locker as we have not sold about 1400 without one single failure,

The HD 24 spline shafts are OK for 95% of vehicles, the weak link on the 110 rear is the ring and pinion design so this is what we have focused on improving,

Dave

Excellent, thanks Dave.

Originally Posted by platebasher

Hi there,we have a clunk in rear diff wich i first noticed with about 11000km on it, out of warranty ,have been to transmision specialist,they said its normal,went to landrover specialist and they took it for drive,checked it out and said it is the axles/splines etc that make it clunk,about a grand to put hd axles etc into it.it has only 17000km on it now,will get that fitted soon,hopefully will fix it!

Spline wear has been a known issue going back some years. Converting from greased wheel bearings to oiled overcomes wear issues for bearings and splines. Some aftermarket axles utilise longer splines as well.

Originally Posted by Bush65

Spline wear has been a known issue going back some years. Converting from greased wheel bearings to oiled overcomes wear issues for bearings and splines. Some aftermarket axles utilise longer splines as well.

Yep, mine used to rip through the splines until I fitted HD shafts and flanges and went to oil lube.

It's also worth noting that a 'clunk' from a Puma's rear diff might also simply be the loctite/bolt/flange issue - which is well documented elsewhere in the forum.

Hi all,

For those that have not read the whole thread, we have designed and made a replacement diff assembly for the 110 rear,

Stock ratio
New housing
Hypoid ring and pinion
Bigger crown wheel bolts
Bigger end cap bolts

Can be fitted with any 24 spline rover (not P38) centre,

Due to the longer pinion the propshaft will have to be shortened,

Well we have built the first one up and it looks quite good, assembled no problem,













Hope to be testing very soon,

I really wish these came with 4:11 or similar!