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Diff locker for front axel

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26 Nov 2014 23:08 #130721 by Busta
Replied by Busta on topic Diff locker for front axel
A couple of vids of car with auto-locking diffs in the front only:





Doesn't change the fact that there isn't an easy bolt-in option though :(

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  • Yellostreak
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27 Nov 2014 01:37 #130724 by Yellostreak
Replied by Yellostreak on topic Diff locker for front axel

Busta wrote: Old thread on this same topic.

If a lockrite works as it should (e.g. locks when one wheel loses traction, unlocks when both have traction) then I can't see the problem? We're not talking about welding up the diff- A lockrite is not always locked, so wouldn't be the same as trying to turn with a locked ARB.


Actually a lockright works the other way around.. in normal driving it is locked and only when there is sufficient differential from inside to outside wheel it disengages... this is why they are called 'positive lockers'.. of course being axle deep in mud there will never be this differential which is why they are great in the back for off-roaders... I can imagine why it would be a nightmare to have one on a public road in the snow though!.. (but great fun in a car-park!)

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27 Nov 2014 08:26 #130725 by Busta
Replied by Busta on topic Diff locker for front axel

Yellostreak wrote:

Busta wrote: Old thread on this same topic.

If a lockrite works as it should (e.g. locks when one wheel loses traction, unlocks when both have traction) then I can't see the problem? We're not talking about welding up the diff- A lockrite is not always locked, so wouldn't be the same as trying to turn with a locked ARB.


Actually a lockright works the other way around.. in normal driving it is locked and only when there is sufficient differential from inside to outside wheel it disengages... this is why they are called 'positive lockers'.. of course being axle deep in mud there will never be this differential which is why they are great in the back for off-roaders... I can imagine why it would be a nightmare to have one on a public road in the snow though!.. (but great fun in a car-park!)

Same difference! The diff always drives the slowest wheel, and locks when the speed of both wheels is the same (e.g. driving in a straight line). If you are turning a corner but have good grip, it will only drive the inside (slower) wheel. If this wheel starts to spin, when it reaches the speed of the outside wheel the diff will lock and both wheels are driven.

The biggest downside is that, unless you are driving dead straight on a consistent surface, it is always sending all the torque to one wheel. Essentially it is doubling the torque load on the axle compared to an open diff (which can never send more than half the total torque to one wheel).

It won't prevent you from steering as you still have an open diff in the back, and the wheels that are locked can be pointed to where you want to go. It's not the same as having both diffs locked, or even just a rear diff locked.

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28 Nov 2014 14:11 #130810 by jimnydms
Replied by jimnydms on topic Diff locker for front axel

Busta wrote:

Yellostreak wrote:

Busta wrote: Old thread on this same topic.

If a lockrite works as it should (e.g. locks when one wheel loses traction, unlocks when both have traction) then I can't see the problem? We're not talking about welding up the diff- A lockrite is not always locked, so wouldn't be the same as trying to turn with a locked ARB.


Actually a lockright works the other way around.. in normal driving it is locked and only when there is sufficient differential from inside to outside wheel it disengages... this is why they are called 'positive lockers'.. of course being axle deep in mud there will never be this differential which is why they are great in the back for off-roaders... I can imagine why it would be a nightmare to have one on a public road in the snow though!.. (but great fun in a car-park!)

Same difference! The diff always drives the slowest wheel, and locks when the speed of both wheels is the same (e.g. driving in a straight line). If you are turning a corner but have good grip, it will only drive the inside (slower) wheel. If this wheel starts to spin, when it reaches the speed of the outside wheel the diff will lock and both wheels are driven.

The biggest downside is that, unless you are driving dead straight on a consistent surface, it is always sending all the torque to one wheel. Essentially it is doubling the torque load on the axle compared to an open diff (which can never send more than half the total torque to one wheel).

It won't prevent you from steering as you still have an open diff in the back, and the wheels that are locked can be pointed to where you want to go. It's not the same as having both diffs locked, or even just a rear diff locked.


Ok, how would the steering be if you had a lockrite in front and rear, would it not be effective for off road or trials ?

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28 Nov 2014 14:39 #130812 by X8GGY
Replied by X8GGY on topic Diff locker for front axel
I think the best description for a Lockright tyre "positive locking diff" is an "un-locker"? i.e. it's locked all of the time until there is sufficient forces for the teeth to jump a position when cornering... hence why they chatter and bang!

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So, from what I read above, the ideal situation would be to have an ARB air-locker in the back, and a LSD (Limited Slip Differential) in the front with 26 spline shafts and big CVs? ;) :whistle:

Now... who do we know with that in the Jim'? :P
The following user(s) said Thank You: Yellostreak

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28 Nov 2014 16:28 #130822 by Busta
Replied by Busta on topic Diff locker for front axel
The ideal solution would be a true automatic locking diffs, e.g an airlocker that worked automatically like a lockright is supposed to (if you believe the sales blurb). Or an LSD that fitted in the axle with normal halfshafts and CVs and worked even when you have a wheel in the air. A decent traction control system takes some beating too! Unfortunately there aren't many easy options for the Jimny though.

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28 Nov 2014 16:40 #130826 by Busta
Replied by Busta on topic Diff locker for front axel

jimnydms wrote: Ok, how would the steering be if you had a lockrite in front and rear, would it not be effective for off road or trials ?

People have done it with SJs and got on pretty well.

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28 Nov 2014 16:58 #130828 by Yellostreak
Replied by Yellostreak on topic Diff locker for front axel
best solution for standard axles is ARBs front and rear with uprated shafts... but who's for 2500+ to spend on that! :(

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29 Nov 2014 15:30 #130900 by X8GGY
Replied by X8GGY on topic Diff locker for front axel
Hmmm... a Jimny front LSD -

4xfourart.com/Product/39/Jimny-“SMARTLOC...fferential-Lock.aspx

Found when having a wander around t'internet killing time in the post office ;)

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29 Nov 2014 16:18 #130911 by Yellostreak
Replied by Yellostreak on topic Diff locker for front axel

Jimny-Dave wrote: Hmmm... a Jimny front LSD -

4xfourart.com/Product/39/Jimny-“SMARTLOC...fferential-Lock.aspx

Found when having a wander around t'internet killing time in the post office ;)


and they do one for the rear too... :):):)

but not half shafts and CVs... :(:(:(

Don't think I'd want to put any kind of locker in the front without some HD shafts and CVs..

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29 Nov 2014 18:50 #130948 by Busta
Replied by Busta on topic Diff locker for front axel
Good find! Looks like there's a bit more science to it than a Lockright too, although the same website has a Lockright style diff and calls it a 'progressive' differential lock... Now we just need someone to buy one and tell us if they are any good.

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29 Nov 2014 20:06 #130954 by supergaz
Replied by supergaz on topic Diff locker for front axel

Jimny-Dave wrote: Hmmm... a Jimny front LSD -

4xfourart.com/Product/39/Jimny-“SMARTLOC...fferential-Lock.aspx

Found when having a wander around t'internet killing time in the post office ;)


Umm tempted, but only if it was 36 splined. Might just go ARB eventually.

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