Diff Ratios and Lockers.

noj44 · 20th April 2014, 04:46 PM

Hi. This is a general question. Does the diff C/P ratio have any bearing on a locker like Detroit, e-locker etc. For example say I have the standard 3.54 Defender diff ratio with a Detroit locker and I want to change to say a 4.11 ratio. Does the locker still fit or does it need to be swapped for a different one.

I am not in any situation where this applies as it is something I have thought about for the future. Hope this is explained enough to make sense.

Thanks.

**Psimpson7** · 20th April 2014, 04:57 PM

No it makes no difference. Any locker can basically be used with any ratio

noj44 · 20th April 2014, 05:04 PM

Straight answer. Thanks.

**uninformed** · 20th April 2014, 05:09 PM

Originally Posted by Psimpson7

No it makes no difference. Any locker can basically be used with any ratio

Is there a carrier change over for ratio above/below on the Sals?

**101RRS** · 20th April 2014, 05:12 PM

Certainly detroits have different models numbers for different landie sals diffs. My 101 Detroit has different model number to that for a Defender sals - the 101 Detroit is about $100 cheaper than the Defender version.

How that equates to real life fitmet I am not sure.

Cheers

Garry

**Slunnie** · 20th April 2014, 10:16 PM

Originally Posted by garrycol

Certainly detroits have different models numbers for different landie sals diffs. My 101 Detroit has different model number to that for a Defender sals - the 101 Detroit is about $100 cheaper than the Defender version.

How that equates to real life fitmet I am not sure.

Cheers

Garry

Is the 101 a 4.7 diff? I though somewhere in the system the 4.7 had a different hemisphere to the 3.54, but I've looked at lots of different diffs.

**Slunnie** · 20th April 2014, 10:23 PM

Looking at the ARB guide, rover diffs vary only by axle halfshaft spline count. Salisbury diffs have a different hemisphere between the 4.7 and the 3.54 which I assume is the crownwheel flange offset.

http://www.arb.com.au/media/products...tion_chart.pdf

**isuzurover** · 20th April 2014, 10:48 PM

Previous posters have only given you half the answer...

If you have a locker which replaces the entire diff centre (= most lockers) then you need to consider:

Rover diffs: 3.54 and 4.7 ratios have a different flange position (i.e. most lockers are 3.54 type and need a spacer ring under the crownwheel to fit a 4.7 diff). Most aftermarket parts are made to fit the 3.54 centre.

Salisbury diffs: There is a flange position change between 4.3:1 and 4.56:1 ratios. Spacer rings are uncommon for Sals (Dana 60) type lockers so you need to buy the right one.

"Lunchbox Lockers": this type replaces the diff centre internals. This type of locker is not available for rover AFAIK (only salisbury) - the locker is unaffected by ratio.

2stroke · 22nd April 2014, 06:08 AM

Originally Posted by garrycol

Certainly detroits have different models numbers for different landie sals diffs. My 101 Detroit has different model number to that for a Defender sals - the 101 Detroit is about $100 cheaper than the Defender version.

How that equates to real life fitmet I am not sure.

Cheers

Garry

I seem to remember the Sals Detroits used the original carrier and the Detroit mechanism replaces the side gears, crosshafts and planetaries. Wouldn't a 101 have bigger axles, ie 30 spline? Maybe that's the reason for the different part no?

**rick130** · 22nd April 2014, 06:26 AM

Originally Posted by 2stroke

I seem to remember the Sals Detroits used the original carrier and the Detroit mechanism replaces the side gears, crosshafts and planetaries. Wouldn't a 101 have bigger axles, ie 30 spline? Maybe that's the reason for the different part no?

Yep, it's just a shaft difference, the 101 and 110/130 are both No-Spins that replace the guts of the Sals centre as the Sals is a 4 pinion diff (unlike most Dana 60's)

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