Chinese diff locks

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Originally Posted by isuzurover

Yes the P38 type diff is so names because it first appeared in the P38A RR.

As for banjo (rover and P38) vs salisbury, There are 2 main differences:

The rover and P38A diffs have an 8.25" crownwheel, the salisbury 9.75"
https://www.aulro.com/afvb/images/im...014/11/201.jpg
http://www.lrfaq.org/Series/images/R...sburyDiff2.jpg

The sals is hypoid, the rover is spiral bevel. Hypoid diffs are stronger (going forwards) as they have much more tooth contact between pinion and crownwheel for the same geometry and ratio.
https://www.aulro.com/afvb/images/im...13/10/1195.jpg
http://lh5.ggpht.com/_EhOQGW2GHBg/TM...jpg?imgmax=800

In short, the sals diff centre is probably about 4x the strength of a rover or P38A

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Ok, I may now have a daft question... You say the Salisbury/Hypoid is 'stronger going forward'.. What's it like in reverse... (Ie:- The front diff in my 101)? Great pic comparison too! Cheers.

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Originally Posted by Sitec

Ok, I may now have a daft question... You say the Salisbury/Hypoid is 'stronger going forward'.. What's it like in reverse... (Ie:- The front diff in my 101)? Great pic comparison too! Cheers.

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Still outrageously strong!

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Originally Posted by rick130

Lots in terms of CWP, but you still have the same (read relatively weak) shafts, CV and stub axles, so IMO a well built Rover diff in the front is preferable to sourcing and fitting a Sals.

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That was my next question! haha

As Dana 44 front diffs are pretty common in the states..

RR, I believe the Sals is basically a metric Dana 60, not a 44.

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Originally Posted by Sitec

Ok, I may now have a daft question... You say the Salisbury/Hypoid is 'stronger going forward'.. What's it like in reverse... (Ie:- The front diff in my 101)? Great pic comparison too! Cheers.

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As Slunnie said more than strong enough.

However the 101 is unusual in that it has 2x low pinion hypoid diffs. The front is actually stronger in reverse than forwards.

Most vehicles with hypoid diffs have a low pinion rear and high pinion front, which means both diffs are weaker driving in reverse.

Some toyotas with high pinion fronts are known for breaking front diffs if you give them too much right foot in reverse. However these are diffs with 7.5-8" crownwheels...

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Originally Posted by isuzutoo-eh

RR, I believe the Sals is basically a metric Dana 60, not a 44.

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That is correct. Dana 60 parts can be interchanged with Sals parts.

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Originally Posted by isuzutoo-eh

RR, I believe the Sals is basically a metric Dana 60, not a 44.

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No wonder it's bullet proof! The yanks call the 60 a "1 ton diff"!

When you see those two diffs side by side, you really get an appreciation of why the Salisbury is considered to be tough. That was engineered to last, wasn't it!

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Originally Posted by sheerluck

When you see those two diffs side by side, you really get an appreciation of why the Salisbury is considered to be tough. That was engineered to last, wasn't it!

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Rather than engineered to last, I tend to think it was a compromise. Based upon the Dana 60, while suitable for the 101 it was designed for larger vehicles than most of our Land Rovers. So they compromised with the size of the half shafts and cv's and reduced the wall thickness of the axle tubes.

The result is a diff that is overkill strength and size wise, but overall no stronger than the weakest link.