Life of Puma Rear Diff's

**uninformed** · 7th March 2013, 11:28 AM

Originally Posted by newhue

Dave, I think I have missed something. Please don't take it the wrong way as I'm intrigued.

Why only a Rover, and not P38.

With Defenders coming with a P38 rear wasn't that the idea. An upgrade of the standard diff. Where as now a whole diff replacement is required.

Do Disco's 1 and 2's? come with rear rover diffs suitable for a donor? Do they swap straight in? Swapping a front is too much hassle for most.

I think there may be some confusion (at least I might be

)

this new Ashtrans diff is an upgrade for the weak P38 type, mostly for the rear of later 110/130 (Some Td5 onwards) Note, no 90s have this diff fitted (dont say wolf either

)

It uses the stock P38 type axle housing
It has a NEW cast 3rd housing
It uses a Rover type diff Center
It has a brand new design, hypoid Ring and Pinion
It will require the stock propshaft to be modded due to the pinion and therefore the cast center being longer.

But will it use the stock P38 type axle shafts?

regarding your "whole diff replacement" comment Newhue, are you saying the entire axle assembly or just the 3rd member section? This new Ashcroft diff does not require a whole new axle assembly, aka rover type axle housing, and is an upgrade of the standard diff. Problem is, the standard diff is of a design that the weak link can not be improved internally or within the 3rd section. This is why they have designed a whole new casting. This allows a longer pinion with more seperation between the pinion bearings (one of the big P38 type problems) and it also allows them to make a hypoid gear set for a much stronger ring and pinon design (another weak point for the P38 type). Regardless of which way you went, a carrier (diff center) upgrade would have been on the cards as the P38 type isnt great.

This is a bolt in upgrade, yes a little propshaft work but not a big deal in the scheme of things.

cheers
Serg

**Bush65** · 7th March 2013, 01:22 PM

When people use the term diff, they usually do not mean the differential but something else that must be inferred by the context or some other cue from the post.

In the last post from newhue I'm clueless as to what he is stating/asking. Sorry, if any offense is taken, none was intended, but is how it is.

**uninformed** · 7th March 2013, 01:52 PM

Originally Posted by Bush65

When people use the term diff, they do not mean the differential but something else that must be inferred by the context or some other cue from the post.

In the last post from nuehue I'm clueless as to what he is stating/asking. Sorry, if any offence is taken, none was intended, but is how it is.

communication is the key to life and terminology the key to communicating......I strugle with terminology alot (lack of knowledge) but I do try.

**ashtrans** · 8th March 2013, 07:44 AM

Hi,

Serg is spot on, I think the confusion is from the terminology I used,

You don't have to change the axle housing, the new HD diff is an easy bolt on,

The 'rover' part I referred to is the diff centre that we use in the diff assembly,

We used the rover centre as opposed to the P38 centre partly to get the offset we needed for the new gears and partly as there are far more options available for the rover type,

Hope that makes more sense !

Dave

**Tomo** · 8th March 2013, 09:12 AM

I see the brass pipework in the photos (on previous page) Is that for a locker?

What are the differences between 'rover' diff and 'P38' diff? I thought they were both rover diffs? I know what a salisbury looks like but I cannot tell the diff (haha) between 'rover' or 'P38'.

I guess the take home msg is that Ashtrans should soon have a nice relatively easy upgrade package for post sailsbury defenders (late TD5 - Puma)

Nice to know for the future, however personally I wont be looking for one till the original diff craps out (original diff 80K and perfect, It does get an easy life...)

**newhue** · 8th March 2013, 10:44 AM

That's all it is, confusion of the written word. I misinterpreted Dave's statement "can be fitted to any 24 spline rover (not P38) centre". As not fit any P38, only rover housings. Where as I should have read it as a total nose casting had been made to fit onto a P38 housing.
This is why I asked, my apologies for not knowing exact terminology. Or frustrating anyone.

**uninformed** · 8th March 2013, 11:07 AM

Newhue, dont let it happen again

Dave, I know it would probably be normal to upgrade the axle shafts when getting your new diff. But in a pinch, will stock P38 type axle shafts work? Im wondering if the new carrier, based on the rover type is narrower, thus requiring longer shafts?

**ashtrans** · 8th March 2013, 08:35 PM

Hi,

yes it's fine with the stock shafts, HD ones are optional, so if you already have HD ones, ours or HTE they can be reused,

Dave

**Drover** · 10th March 2013, 07:06 AM

Just caught up on this thread....what great news

I already have Ashcroft's half shafts and drive flanges so I am part way there.

Dave, any idea on when this new centre might be available to the public ?

Cheers
Grant

**Sheppie** · 11th March 2013, 06:35 PM

Originally Posted by n plus one

2009 Puma 67k. About to get my second set of half shafts under warranty - no noise from the diff just a fair bit of freeplay in the system.

Not really sure the shafts are the issue though - any thoughts?

Ive got 16kon the clock now and all good but there is a fair bit of free play in the output shaft.
release clutch - clunk- drive

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