front or rear lockers

Submitted: Sunday, Feb 23, 2014 at 18:35
ThreadID: 106386 Views:2263 Replies:4 FollowUps:10
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Hi just wondering if anyone has advice on what diff would benefit me more to install a locker as i can't afford both front and rear
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Reply By: Dennis Ellery - Sunday, Feb 23, 2014 at 18:51

Sunday, Feb 23, 2014 at 18:51
I have both front and back lockers.
My next choice would be the LSD at the rear and a lockable diff at the front.
I haven’t seen this setup used previously – I would investigate it with a professional before I made the change.
AnswerID: 527080

Follow Up By: brendan l4 - Sunday, Feb 23, 2014 at 19:01

Sunday, Feb 23, 2014 at 19:01
Yeah that was what i was thinking two as i have an 80series with and LSD rear diff all ready. I find alot of the time you rely on front wheel grip to pull you through boggy situations.
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Follow Up By: Whirlwinder - Sunday, Feb 23, 2014 at 21:45

Sunday, Feb 23, 2014 at 21:45
Dennis,
I have an 80 series part time 4wd with a "Lock Right" auto unlocker in the front and it is a great combo. Rarely have I needed the winch or a snatch. It has been in there for 13 years and absolutely trouble free.
The LSD is not that good these days but with so much weight on the back wheels it doesn't seem to matter but the front is a different matter. Needs all the help it can get for traction.
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Follow Up By: brendan l4 - Sunday, Feb 23, 2014 at 22:12

Sunday, Feb 23, 2014 at 22:12
Ok thanks for the advice.
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Follow Up By: mikehzz - Sunday, Feb 23, 2014 at 23:04

Sunday, Feb 23, 2014 at 23:04
My Jeep has an nice LSD in the rear and an airlocker up front. I'm happy with it. If both diffs were open and I had to choose I would go rear first before front.
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Follow Up By: Member - Serendipity(WA) - Sunday, Feb 23, 2014 at 23:58

Sunday, Feb 23, 2014 at 23:58
I have a Toyota VDJ 70 series ute. The ute comes with an LSD in the rear so I went with an electronic diff locker in the front.

Sure the toyota LSD don't last long so I had it in the shop to be reshimmed and replated. Now much tighter and working as it should.

With the electronic locker in the front I find most times it is the front wheels that just need to pull you over that last bit and if there was a locker in the rear it would only spin and tear at soft sand or mud. The result would be very close to the top but bogged.

I like having an LSD for most of my driving and not having to worry too much. Then when the going gets tough and the front diff is not enough I can activate the front locker. It pulls me through when the rear end is sagging and digging in.

Cheers

Serendipity


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Reply By: Allan B (Member, SunCoast) - Sunday, Feb 23, 2014 at 19:05

Sunday, Feb 23, 2014 at 19:05
Hi Brendan,

When I added a locker to the Troopy I sought the wisdom of my 4WD mechanic as to whether it should be front or back axle.
His advice was as follows:

1. As the Troopy has coil springs on the front and leaf springs on the rear, the front wheels have better articulation and are more likely to remain in contact with the ground. Therefore with the rear axle more likely to lift a wheel it was the rear that would most benefit from a locker. Note that as usual for a Land Cruiser, the existing limited slip diff on the rear was useless.

2. I had more weight on the rear axle and thus needed more drive there so again.... locker on the rear.

3. With a locker on the rear there is less interference to the steering.

So I went along with his recommendation. Have needed it little so far so have not tested his logic.

Cheers
Allan

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Reply By: Ross M - Sunday, Feb 23, 2014 at 19:29

Sunday, Feb 23, 2014 at 19:29
What sort/brand/type of vehicle are you talking about?
Many modern smaller 4wd have an LSD which works and therefore a locker in the front of IFS is a god thing.
There are many ways to view this and unless the application is known you may not get the best recommendation for your purpose.

Sometimes Free Wheel Hubs are also employed and the options of use are further increased.
With Full time 4wd types the rules change again.
AnswerID: 527082

Follow Up By: brendan l4 - Sunday, Feb 23, 2014 at 20:00

Sunday, Feb 23, 2014 at 20:00
I have an 80series landcruiser with an LSD in the rear
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Follow Up By: gbc - Monday, Feb 24, 2014 at 06:09

Monday, Feb 24, 2014 at 06:09
If it is a gxl cruiser an auto locker in the front would necessitate A part time 4wd kit to also be installed which may make a locker in the rear a more attractive option.
Locking either end will make an 80 twice as capable as it is now. The rear will be of slightly more benefit uphill due to weight transfer. The other thing with an 80 is the strong rear diff vs the not so strong front diff. It could be argued that the weaker diff should get the locker, but neither end is going to race and bounce very much any more with the other end locked up - spinning the front and dropping it again really hurts a Toyota high pinion diff.
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Reply By: get outmore - Sunday, Feb 23, 2014 at 19:41

Sunday, Feb 23, 2014 at 19:41
guy from whyalla who used to frequent this forum had an online mag a while ago

he did quite a comprehensive test fully written up on which provides the most benifit and its the front by quite a large margin
AnswerID: 527084

Follow Up By: Robin Miller - Sunday, Feb 23, 2014 at 20:31

Sunday, Feb 23, 2014 at 20:31
That was Andrew Hiscock GetOutMore.

http://www.4wheelingoz.com/


I actually wrote that article for the mag, and had a lot of fun doing it.

Basically it comes down to putting the lockers on the axle with least articulation as it obviously lifts a wheel first.

For coil sprung live axle cars this is usually front axle.

Robin Miller

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Follow Up By: brendan l4 - Sunday, Feb 23, 2014 at 21:57

Sunday, Feb 23, 2014 at 21:57
No worries, cheers, that makes sense. I own an 80 series landcruiser so it has a rear LSD. Although i hear that the cruiser LSDs are not very effective.
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Follow Up By: Member - KBAD - Monday, Feb 24, 2014 at 17:51

Monday, Feb 24, 2014 at 17:51
Brendan that is correct but you can get the rear shims on the clutch in the LSD adjusted /packed so it will engage as it should. I have a front and rear locker use the rear first then only if needed or looks a hairy straight section will engage both. Remember that if you have the front locked steering is C$%p.
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