Front diff yoke movement.

**PeterH** · 19th February 2014, 09:08 PM

Awesome info wayneg, I'm thinking of fitting a good second hand one, now I know what to look for!
Most appreciated.

**wayneg** · 19th February 2014, 09:35 PM

Originally Posted by clubagreenie

Just get one of the replacement centres with locker from Ashcroft, this solves all the issues with these diffs doesn't it?

I am not aware of any issues with the P38 diffs, Never heard of any one having a failure.

**Scouse** · 19th February 2014, 09:42 PM

Apparently the problem is due to the distance between the pinion bearings being relatively short.
This means that, probably badly worded, they can't support the force transmitted along the pinion shaft as well.

**wayneg** · 19th February 2014, 09:55 PM

Originally Posted by Scouse

Apparently the problem is due to the distance between the pinion bearings being relatively short.
This means that, probably badly worded, they can't support the force transmitted along the pinion shaft as well.

This I think is not a P38 issue its a P38 diff fitted to a Puma Defender issue, must be different forces at work. Plenty of P38a`s get noisy diffs after 150000k`s+ but that`s not exactly a weakness

**TheTree** · 20th February 2014, 07:32 AM

Originally Posted by clubagreenie

Just get one of the replacement centres with locker from Ashcroft, this solves all the issues with these diffs doesn't it?

Hi,

That is on my list once I get some other things done, luckily I only have a high speed whine from my rear diff so far!

Steve

**clubagreenie** · 20th February 2014, 01:39 PM

The P38 centre is the same in P38 and Defender just the defender seems to report more issues than P38's. Either way, it's a better product, solves the issue, is reverse cut (as far as I'm aware) and has a locker.

Win, Win, Win.

**wayneg** · 20th February 2014, 02:20 PM

[QUOTE=clubagreenie;2092004]The P38 centre is the same in P38 and Defender just the defender seems to report more issues than P38's. Either way, it's a better product, solves the issue, is reverse cut (as far as I'm aware) and has a locker.

Win, Win, Win.[/QUOTE

Am I missing something here? I have hands on experience of fitting an ARB locker into a P38a diff. The Pinion is retained, not even touched and the original crown wheel transferred to the locker. How can fitting a locker overcome any pinion bearing issue?
A quick look at the Ashcroft website shows similar fitment to ARB types
Ashcroft Transmissions

**RR P38** · 21st February 2014, 06:09 AM

A complete rebuild (bearings) is about $400, you might get it done for less.

**steveG** · 21st February 2014, 07:05 AM

Any chance its just a loose nut on the flange?
Probably unlikely, but a quick job to check it before committing to rebuilding/replacing a diff.

Steve

**PeterH** · 21st February 2014, 09:18 AM

SteveG, it's definitely inside the diff, the whole yoke moves, the uni joint is new, no movement of the uj at all.
I probably overstated the movement, had a close look yesterday, it is more like 1 - 2mm movement, I was only guessing at the 3 - 4mm I stated earlier.
It has no vibration at all under about 70 kmh, but as you get closer to 80 kmh and upwards it gets worse.
At the moment I'm only driving locally, I don't want to do any big trips until I have this sorted.

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