My diff saga continues..

**Tusker** · 30th May 2007, 12:20 PM

My diff sagas continue. We know the P38 diff design isn’t the best, but…To recap:

Maxidrive difflock fitted when new, early 2004. 2 yrs later, noisy CW&P. No backlash at all.. Grr.
Fitted 4.11s, supposed to be stronger. Noisy & causing vibration within 6 mths. Grrr. No water in the oil, no broken teeth, no fragments, bearings perfect, pinion nut torque fine.
Replacement 4.11 CW&P marked rear is in fact a front. Further delays. Grrrr
Contemplated incurring egg on face, & doing a retro swap for a Salisbury. Needs extra $$$ for yet another difflock, another 4.11 CW&P, and engineering certificate. But after watching the Salisbury cars get hung up at Yalwal last weekend, this is a last resort.
Found out today no more P38 Defender 4.11s for 60 days. Bulk order by Israeli Army. Grrrrr Why are they fitting them? Having trouble in 3.54 trim? Hopefully not coz they’re having trouble in 4.11 trim and these are replacements!

Maxidrive have been pretty good in trying to sort something out. Mal is suggesting running the surplus front in the rear as a short term measure. I’m sure Mal is right, but I didn’t know Rover CW&Ps & P38 CW&Ps were interchangeable. And I always thought front diffs were reverse cut, but apparently not from the factory. Its only the after-market CW&Ps that have the extra step viz. being cut front & rear differently.
Now I’m wondering if a front 4.11 went into the rear 6 months ago!
Regards
Max P

**Scouse** · 30th May 2007, 12:46 PM

Just for your info Max, Discos use the same diff front & rear & so do the P38s now (front diff # supercedes to rear diff #) so the teeth cut can't be different with those at least.

Would you need an engineers report for a Salisbury ?
It's a direct swap with no welding of mounts or other mods needed.

**Tusker** · 30th May 2007, 01:19 PM

Originally Posted by Scouse

Just for your info Max, Discos use the same diff front & rear & so do the P38s now (front diff # supercedes to rear diff #) so the teeth cut can't be different with those at least.

Would you need an engineers report for a Salisbury ?
It's a direct swap with no welding of mounts or other mods needed.

Having a healthy respect for Sod's Law, I assumed something would be different. What are the odds of the ABS just bolting up I wonder?

**Scouse** · 30th May 2007, 01:25 PM

Originally Posted by Tusker

Having a healthy respect for Sod's Law, I assumed something would be different. What are the odds of the ABS just bolting up I wonder?

I'm not sure on the ABS side of things but I should also mention that you'd need to fit the rear prop shaft from the Salisbury Defender too (different length).

**BigJon** · 30th May 2007, 04:14 PM

Providing you got a diff (complete assembly, disc to disc) from an ABS equipped vehicle there shouldn't be any dramas. We are about to do this swap in a 130 (no ABS), I will let you know if there are any hassles.

**justinc** · 30th May 2007, 05:14 PM

Hi Max,
We just did it today on a 2005 110.
This was the vehicle that had 2 pinion bearing failures and a CW&P also. It has 76,000km on the clock only, and NO off road work, just tows a heavy trailer.
We bought an ABS sals because the castings at the end of the axle tubes are completely different to the early Tdi and county non ABS models. For your info, all the hubs, stubs and calipers fit from the P38A defender diff, but the axles are different lengths.

Now this guy isn't worried about his diff any longer....

JC

**dobbo** · 30th May 2007, 05:28 PM

Bummer, Max you'll have to do something, It just wouldn't be proper for Tusker to miss the expo or worse turn up to the expo clean and only front wheel drive. My kids would be devistated.

**Bush65** · 30th May 2007, 05:54 PM

Not all aftermarket 4.11:1 cw&p are reverse cut for the front.

I bought my 4.11:1's from Dave Ashcroft. Both are normal cut, but they get their strength from having larger teeth than the stock rover cw&p.

I bought the Ashcroft gears because I wasn't keen on having the reverse cut gears.

The front does not need to be as strong as the rear while going forward. However for situations where reversing up a steep obstacle is involved, I did not want the then weak reverse cut gears.

**Blknight.aus** · 30th May 2007, 06:15 PM

Originally Posted by Tusker

Having a healthy respect for Sod's Law, I assumed something would be different. What are the odds of the ABS just bolting up I wonder?

Im going to find out.. Im about to buy sclarks rear diff (well swmbo will be paying as soon as alex goes to bed tonight.

**Slunnie** · 30th May 2007, 06:36 PM

Argh! Don't go the Salisbury Max! I think that you'd be so disappointed in the diff every time you became hung up. If I start blowing diffs I'd be changing over to Toyota centres which are stronger and with heavier axles.

Interesting with the CW/P though.

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