Thread: Life of Puma Rear Diff's

Originally Posted by uninformed

Hi Dave, will this share the R&P from your force 9?

Since it is rear application only, did you consider making a new cast center to adapt ford 9inch gear sets so more availablility of R&P would be there?

Best of luck with it
Serg

Hi Serg,

No it's a different R&P , the F9 is a high pinion and would not let us use our existing rover locker,

Also the F9 casing has clearance issues on a stock vehicle,

This new diff will take our stock rover air locker and be 3.54 ratio, ie a bolt in upgrade but will require the prop to be shortened a little,

Dave

Originally Posted by justinc

Serge, I was in no way advocating fitting one of these, unless 40"tyres are planned... These trucks are pretty heavy...

Just noting the size of them; even they have issues too apparently. a pair of D80 units are being about to be trialed in a couple of OKA now, Cummins 6BT and Allison1000 in front of them, and 40"tyres....

JC

when you say "these trucks", do you mean our LR's or the Oka's?

A well built Ford 9 in a good housing can cope with some serious abuse...more than that you can step up to the 10inch Trophy Truck R+P...

Ruffstuff specialties in the USA are making fabbed housings for both the D60 and 14b, I believe there are 2 companies making drop out thirds for the 14b and one (Jratoffroad) for the D60 (called sixty9)

There is one guy on Pirate who builds alot of big hp (1000+) axles for mud racers and pullers. He believe that even though the 14b has the extra pinion support like the Ford 9, that the gear design in the D80 is superior..

Since the P38 housing is to be retained for the benfit of the owner (and probably nothing wrong with it), IMO it would be nice to see a custom cast third that uses some already common gearsets...but the space/size obviously dictates that...

Originally Posted by ashtrans

Hi Serg,

No it's a different R&P , the F9 is a high pinion and would not let us use our existing rover locker,

Also the F9 casing has clearance issues on a stock vehicle,

This new diff will take our stock rover air locker and be 3.54 ratio, ie a bolt in upgrade but will require the prop to be shortened a little,

Dave

sounds good, I take it the ring gear is thicker than LR's offering in the P38?

Originally Posted by rick130

I've often thought D44 CWP's would make a good base to cast a drop in centre around.
Plenty of options for ratios and availability of good quality CWP's.

I agree. 8" hypoid?

Originally Posted by Slunnie

I agree. 8" hypoid?

The toyota is an 8" hypoid. AFAIK the D44 is 8.75".

Originally Posted by uninformed

when you say "these trucks", do you mean our LR's or the Oka's?

A well built Ford 9 in a good housing can cope with some serious abuse...more than that you can step up to the 10inch Trophy Truck R+P...

Ruffstuff specialties in the USA are making fabbed housings for both the D60 and 14b, I believe there are 2 companies making drop out thirds for the 14b and one (Jratoffroad) for the D60 (called sixty9)

There is one guy on Pirate who builds alot of big hp (1000+) axles for mud racers and pullers. He believe that even though the 14b has the extra pinion support like the Ford 9, that the gear design in the D80 is superior..

Since the P38 housing is to be retained for the benfit of the owner (and probably nothing wrong with it), IMO it would be nice to see a custom cast third that uses some already common gearsets...but the space/size obviously dictates that...

OKAs Serge, OKAs...

We were tempted by one a few years back for a camping/ touring rig, but just a little TOO big for us as the tourer would also have to be a DD.
Great idea, but a few drivetrain changes would be a good improvement...

JC

Originally Posted by isuzurover

The toyota is an 8" hypoid. AFAIK the D44 is 8.75".

You're right, I was thinking it was the same CW diameter as Rover, rather than 8"

Originally Posted by justinc

Jeep J20 4x4 have a full floater 8 stud D60.

JC

It was a 1970 J3000, the beefiest J Series made at the time, equivalent to the later J20.

We always assumed the rear end wasn't 'correct' as the front end used the standard Jeep 5 stud hubs. I had genuine service manuals too (unfortunately lost) which may have verified that (?)

We were a Jeep household, Dad had a Wagoneer and the J3000 (which I later inherited and used as a service van ) and I had a CJ-6.

He still hasn't properly forgiven me for going 'Pommy'