Thread: Life of Puma Rear Diff's

Originally Posted by ashtrans

both measure 217mm dia

I've ask this before,why can't you fit a rover HD center into a P38 housing?,is it the stud pattern thats different?. Pat

Originally Posted by djam1

In the Sahara Series vehicles up to about 1973 had a reputation for breaking the tubes.
I was told by Neil at Suttons in Alice Springs that the Series Army Land Rovers had tubes pressed into the axles making them stronger than the Civilian ones.

I presume everyone has seen this

Jordan Rover-Tech :: Jordan Rover-Tech - Perth, Western Australia

The hole in the axle tube and associated welding creates a stress concentration. I know a number of MD locked sals axles which have fractured the same as that - all were used extensively for outback touring.

I have never seen a non-MD-locked sals tube fracture in the same way.

Originally Posted by ashtrans

FYI I can get 2 new ABS type Salisburys complete here in the UK and can supply at £ 1600 ea if you can't wait !!!

Dave

LR Australia recently had a sale of NOS ABS Sals axles disc-disc. They were a LOT less than GBP1600 though!

Originally Posted by PAT303

I've ask this before,why can't you fit a rover HD center into a P38 housing?,is it the stud pattern thats different?. Pat

yes, stud pattern is different but I don't see there being much strength difference, maybe a little better as the pinion bearings are further apart but I think more strength is required for a robust 110 rear end,

Dave

Originally Posted by ashtrans

both measure 217mm dia

Is that the housing (not the casting, but the main housing) or the ring gear dia. I was lead to believe that the p38 type housing is larger in the center section area than a Rover type housing.

Originally Posted by uninformed

Is that the housing (not the casting, but the main housing) or the ring gear dia. I was lead to believe that the p38 type housing is larger in the center section area than a Rover type housing.

sorry thats the ring gear diameter,

the P38 casing bolt pattern is on a slightly larger diameter,

if the ring gear gets bigger it may foul the far side of the casing and the top and bottom cut outs, all of which adding hassle to a 'drop in' upgrade

Dave

Originally Posted by ashtrans

to get back on topic, latest thoughts are :

concept : stronger drop in diff for 110 rear

thoughts :

it's the ring and pinion thats the problem,

keep 24 spline shafts, these were good enough for the salisbury and we stock HD which are even stronger

the existing locker is as strong or stronger than the HD shafts so why not keep it ?, if we can use our P38 varient this will also allow you fit the stock 4 pin or any other centre you desire, the centre is never the problem,

make a new ring and pinion similar to the rover, ie long pinion but with approx 1.5" low hypoid offset, will check but this should increase strength considerably,

make new housing to suit, design casting so it can be machined for P38 or rover application,

new shorter prop will be required due to longer pinion,

thoughts ?

Dave

If it will give me a stronger and more reliable factory diff, I'm interested.

Estimated price Dave, I have your Locker and P38 spacer ring, and axels.

I haven't even looked at costs yet but from other parts we make I could take a guess, depending on how many we make :

ring and pinion £ 225-250
casing £ 200-250
bearings, seal, flange, no more than £ 100

if you want a locker £ 475
if you want HD shafts £ 260

Dave

Originally Posted by ashtrans

to get back on topic, latest thoughts are :
concept : stronger drop in diff for 110 rear thoughts :

it's the ring and pinion thats the problem, agreed

keep 24 spline shafts, these were good enough for the salisbury and we stock HD which are even stronger Use the HD with lockers

the existing locker is as strong or stronger than the HD shafts so why not keep it ? agreed

, if we can use our P38 varient this will also allow you fit the stock 4 pin or any other centre you desire, the centre is never the problem, agreed

make a new ring and pinion similar to the rover, ie long pinion but with approx 1.5" low hypoid offset, will check but this should increase strength considerably, make the pinion length that way so to standardise with existing prop shaft lengths that have been used in previous models.

make new housing to suit, design casting so it can be machined for P38 or rover application, I'm not sure about this if I am reading this right, if existing housings can be used with minimal modification and with tools normally found in a small workshop, then fitting another diff centre would be a lot less complicated for someone that is well away from an engineering works.

new shorter prop will be required due to longer pinion, make the pinion length that way so to standardise with existing prop shaft lengths that have been used in previous models.