Life of Puma FRONT diffs...

**Jode** · 10th August 2013, 01:54 AM

Somehow the idea of using a roll pin to retain a diff cross-shaft seems a bit naff - the Rover diff uses roll pins to hold the adjuster locks in place (as a hinge pin IIRC), but those take hardly any load.

**PAT303** · 10th August 2013, 10:24 AM

Many makes use circlips,having the guts come apart because of this type of issue is very common across the board. Pat

**newhue** · 10th August 2013, 03:57 PM

Originally Posted by n plus one

SNIP
Slightly OT, but I'm not aware of many (any?) P38 explosions? Plenty of excessive wear stories, but nothing that would get you stranded (short of just ignoring an obvious issue developing)?

Yeh maybe bad choice of words. But the amount of random stuff that has been replaced in my 3 years is a little embarrassing for LR I would think. I have beed flat bedded a couple times in 3 years. And the tow truck out of Birdsville at $330p/h I was not going to argue with LR with who should pay if required. A rear diff fail on a car les than 3 years old is darn right discussing if not pathetic in my book. Fail, clunk, explode all a bit the same same really. But yes explode does seem a little excited.

**Jode** · 11th August 2013, 02:52 PM

Originally Posted by newhue

Yeh maybe bad choice of words. But the amount of random stuff that has been replaced in my 3 years is a little embarrassing for LR I would think. I have beed flat bedded a couple times in 3 years. And the tow truck out of Birdsville at $330p/h I was not going to argue with LR with who should pay if required. A rear diff fail on a car les than 3 years old is darn right discussing if not pathetic in my book. Fail, clunk, explode all a bit the same same really. But yes explode does seem a little excited.

Jason -
I think 'explode' was a good choice as it indicated your true state of ****** frustration. You could hardly report that you experienced an operational malfunction linked to the drive train and centred at the point of power transfer utilising hypoid gearing (or some-such).

**rick130** · 11th August 2013, 03:12 PM

Originally Posted by Jode

Jason -
I think 'explode' was a good choice as it indicated your true state of ****** frustration. You could hardly report that you experienced an operational malfunction linked to the drive train and centred at the point of power transfer utilising hypoid gearing (or some-such).

That's part of the problem, they aren't hypoid but centre spiral bevel......

**newhue** · 11th August 2013, 05:23 PM

**PAT303** · 12th August 2013, 09:20 AM

Considering how many P38 diffs are in vehicles dating back 15 years or so you'd think there would be a long list of unhappy owners out there but there isn't.If you do the type of driving that breaks diffs simply fit an Ashcrofts center,simple. Pat

**Dougal** · 12th August 2013, 09:27 AM

Originally Posted by rick130

That's part of the problem, they aren't hypoid but centre spiral bevel......

On the bright side, they are more efficient than hypoid.

**landybehr** · 12th August 2013, 07:40 PM

Originally Posted by Jode

Somehow the idea of using a roll pin to retain a diff cross-shaft seems a bit naff - the Rover diff uses roll pins to hold the adjuster locks in place (as a hinge pin IIRC), but those take hardly any load.

IIRC "they" have had made their experience on this topic. I think that Rover had roll pins - or was it a split pin? - in the diff´s cross pin back in the times of the SII and earlier.
Early RRCs must have had them, too. Cannot recall completely what went wrong. Think it was wear in the hole of the carrier and the cross pin starting to move. This eventually sheared and the cross pin was tossed out of the carrier.
I think the circlip was an improvement.
But again, not sure I remember all that correctly. Never had any failure other than of the halfshaft (and even this only on leaf sprung LR).

Thread: Life of Puma FRONT diffs...

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