Life of Puma Rear Diff's

I think their strength is in the forward direction due to the angle of the drive face on the gear cut. In 4WDing their Achilles heel is in reverse when they get loaded up. Interestingly, I've seen the Toyota 9" run upside down, ie in reverse when driven forward, in v8 rock crawling buggies with 40"+ tyres and they have been strong. I'm guessing at least that what we are seeing is related to the gear design. I think even the Dodge Viper might only have an 8" hypoid diff too.

Dave, is the new P38 diff that you're making able to be compatible with other CW/P gears in a similar way that Dana60 gears can be made to work with the Salisbury? Eg could a Dana44 gear set for example be modified to fit?

I'm coming in pretty much at the end of this thread but I think it's great that Ashcroft has used the Rover centre as it is so much easier to set up than the Sals!

Quote:

---

Originally Posted by Slunnie

I think even the Dodge Viper might only have an 8" hypoid diff too.

---

I think it's a D44.

What kills our CWP's is the torque multiplication by having low range.

Quote:

---

Originally Posted by Jode

I'm coming in pretty much at the end of this thread but I think it's great that Ashcroft has used the Rover centre as it is so much easier to set up than the Sals!

---

they have not used the Rover centre or the Rover housing!

Quote:

---

Originally Posted by uninformed

they have not used the Rover centre or the Rover housing!

---

It does use a Rover centre.

Quote:

---

Originally Posted by ashtrans

Yes, new housing, new ring and pinion, takes stock rover diff bearings, stock seal and flange, uses rover (non P38) diff centre, locker , ATB, whatever, but with larger crown wheel bolts so the 10 holes will need drilling out to suit,

HD shafts are optional,

Dave

---

Technically you could use a stock rover 2 pinion centre, arguably the weakest part of a rover drive train.

I prefer to think people would use a compatible aftermarket centre, with much improved strength and better support of the crown wheel. Perhaps that is what Serg was driving at!

my reference was to Jode's comment of Rover Vs Sals set up and basing the new Ashcroft P38 HD upgrade on the Rover centre. Again I read that as 3rd member, not diff centre/carrier. So no, its not based on a Rover 3rd. Its a brand new casting that bolts to the P38 housing.

Again, It is a whole new casting for the 3rd member that bolts to the P38 housing. Yes it uses an ASHCROFT diff centre/carrier based on the rover type but much improved.

Quote:

---

Originally Posted by uninformed

my reference was to Jode's comment of Rover Vs Sals set up and basing the new Ashcroft P38 HD upgrade on the Rover centre. Again I read that as 3rd member, not diff centre/carrier. So no, its not based on a Rover 3rd. Its a brand new casting that bolts to the P38 housing.

Again, It is a whole new casting for the 3rd member that bolts to the P38 housing. Yes it uses an ASHCROFT diff centre/carrier based on the rover type but much improved.

---

Thanks for the clarification. The point that I was trying to get across is that Ashcrofts' photos show that they use adjustable nuts to set the carrier bearing pre-load. This is rather easier to manage than the selectable shims that the Salisbury axle uses.

good point Jode, I was thinking along the lines of removable 3rd vs sals. Much easier to set up a removable 3rd on the bench than the sals.