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Thread: ARB DIFF LOCK

  1. #1
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    ARB DIFF LOCK

    Conversion gears are now advailible from British 4WD imports so a series 3 Salisbury ARB air locker can be fitted front or rear on a 101 landrover.
    The cost is 410 dollars plus the cost of the locker which you purchase from any ARB agent.
    See Anthony Johnson.
    There is only a limited number advailible currently.
    The conversion gears are fitted in place of the ARB centre gears to allow fitting the unit on to the much larger 101 axles.

  2. #2
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    Ron,

    We now expect a tutorial from you on how to put these and the diff lock into a front Salisbury.

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  3. #3
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    I got the gears, but finding the money (1200 dollars) for the air locker is a different story.
    I will do pics as I have never fitted a air locker before and the front diff will be alot of work as the CVs will have to come out.
    I have new brakes and seals ready for the front end.
    Its the money problem again.
    I do have a very good air set up on my 101 and even the switch on the dash board marked diff lock, so that side of things should be easy.
    I expect the conversion gears to sell out quickly , so now is the time to get a locker for a 101.
    It is unlikely that any more gears will be made.

  4. #4
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    I have heard that Jacmac can also broach the ARB side gears ???

    As for the locker, I would buy a Dana 60 ARB rather than a Salisbury ARB. I have been told by ARB that the internals are stronger. HOWEVER, this may mean that the Sals ARB side gears will not fit...

    For those who don't know, the Salisbury 8HA was basically a licenced copy of the US Dana 60. The only difference with the diff centres is the salisbury was metricised. All this means as far as fitting a D60 ARB to a salisbury, is that you need to change the carrier bearings.

    If anyone is interested I have the PN's somewhere. (courtesy of Keith from Rovertracks).

    As an aside, there are a whole lot of ratio options:
    4.56, 4.7(LR), 4.88, 5.13, 5.57(LR101), 6.17, 7.17

    ANOTHER (possibly better) option would be just to whack in a 35-spline D60 ARB front and rear, and get custom halfshafts/axles made. i.e. the FC101 has 1.47" diameter, 21-spline axles, whereas the larger D60 axles are 1.5" 35 spline. So you would end up with a significant axle upgrade for only a few more $$$.

  5. #5
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    Quote Originally Posted by isuzurover View Post
    ANOTHER (possibly better) option would be just to whack in a 35-spline D60 ARB front and rear, and get custom halfshafts/axles made. i.e. the FC101 has 1.47" diameter, 21-spline axles, whereas the larger D60 axles are 1.5" 35 spline. So you would end up with a significant axle upgrade for only a few more $$$.
    Why bother going to all that hassle and considerable $$$$$ when the standard setup is better than good enough - as Ron has said the 101 has the axle setup that other landies should have had.

    In my discussions with Keith, I understood that the dyna side gears will fit a salsbury and because the same basic side gears are made to a range of dyna axles they would be plenty strong enough when broached - you would buy the side gears to take the smallest dyna axle and then take it out to 101 axle size. Again when the cost of the dyna side gears and the modifications are taken into account the cost is quite high.

    As I understand it these ARB type side gears are not the standard ARB sides gears that are broached which may have resulted in weak gears - these are a batch of side gears that have been made from scratch.

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  6. #6
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    Quote Originally Posted by garrycol View Post
    Why bother going to all that hassle and considerable $$$$$ when the standard setup is better than good enough - as Ron has said the 101 has the axle setup that other landies should have had.

    In my discussions with Keith, I understood that the dyna side gears will fit a salsbury and because the same basic side gears are made to a range of dyna axles they would be plenty strong enough when broached - you would buy the side gears to take the smallest dyna axle and then take it out to 101 axle size. Again when the cost of the dyna side gears and the modifications are taken into account the cost is quite high.

    As I understand it these ARB type side gears are not the standard ARB sides gears that are broached which may have resulted in weak gears - these are a batch of side gears that have been made from scratch.

    Garry
    What the hell is a dyna??? Some kind of toyota isn't it???

    A DANA 60 ARB costs about the same as a salisbury ARB. Dana 60 ARBs come in 16, 30 and 35 spline variants off-the-shelf.

    Ron seems to have a source for custom gears.

    The other option, as you and I suggested, is to get the ARB side gears broached. So yes, buy a 16 or 30 spline Dana 60 ARB and get it broached.

    You say the 101 setup is as strong as you could possibly want??? There are still people who have broken 101 axles, etc...

    MY point is, that you need to spend $XXX on an ARB locker, then you either spend:
    $410 on the side gears that Ron mentioned OR
    A similar amount getting the side gears broached.
    OR a slightly higher amount for custom axles that are STRONGER.

    In the rear, there may be a 35-spline axle available in the US that will almost swap straight in with a redrilled drive flange. The front will be a custom setup, but there are plenty of suppliers in the US who have 35 spline blanks, and would just need to spline one end to 21-spline.

    A locker puts a lot more stress on axles. While your current axles may be more than strong enough at the moment, if you can spend an extra couple of hundred to get a much stronger setup, why not???

  7. #7
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    Breaking a 101 diff or axle is rare.
    I heard of a 101 axle breaking when a fellow over seas was hard off roading and running 2o inch wheels ( most likely Unimog rubber)
    I very seriously looked at getting standard series three salisbury side gears (AR spark erroded to suit the 101 at a cost of 200 dollars each.
    The spark erroded gears will not be as strong as gears made from stratch to do the job.
    The money on the correct side gears made to suit is good for me.
    A series three salisbury (rear) ARB diff locker must be used as the carrier for the crown wheel has the correct off set to suit the 5.57 to one ratio of the 101 crown wheel and pinion salisbury diff.
    The splines on a 101 axle are 22 spline and of a odd size.
    My personal measurements of OD of a 101 axle splines are 36.20mm or 1.428 thou with the bottom spline radius diameter being 1.316 thou
    Detroit lockers are advailable for the rear of a 101.
    The problem is the front and the 101 has very heavy duty CVs of good design and it is unwise to stuff around around a change these as they work well and so why the ARB conversion gears.
    About ten Mac Mamara special made front lockers were made years ago and I understand they worked well with the existing drive train of the 101.
    Some owners over seas have had standard series three ARB side gears spark erroded and used with no bad effects.

  8. #8
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    I have been running a Detroit Locker in the rear of my 101 for more than two years now .
    The worse conditions you can put a detroit though off road wise is the shock loading of loose rock steps, and I have done this a few times.
    I have had no problems so far.
    I would be very careful about doing that sort of work with the 101 at its full load of 1.5 tonnes......but that is common sense .
    I do like the idea if I do by chance break some thing a Dana stronger option is workable and something I have not though about before.
    But would it be workable on the front diff and the 101 CVs

  9. #9
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    Ron, the Dana 60/Sals diff has 2 flange positions. 4.56:1 and Numerically higher (the one you need for the 101) and 4.3:1 and numerically lower.

    Just as you need to use a SIII Sals ARB for a 101, you would need a 4.56 and higher D60 ARB.

    Whether the EDM'd side gears would be weaker or not depends on whether they are through hardened or not.

    The D60 ARB is stronger than the (old type) Series III/110 ARB, however I believe there will be a new (upgraded) version released soon - if it isn't already available.

    If you fitted a 35-spline D60 ARB to the front, there is no reason you can't retain the 101 CVs, you would just need custom inner halfshafts. However, the new 300m 80-series or D60 longfield CVs would likely be much stronger and could probably be fitted without too much trouble.

    But since you already have the side gears...

  10. #10
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    isuzu rover
    thanks for information.
    If you ever see a 101 landy take a long look at the Cvs they are like no other in the landrover family for size and were the ones choosen for portal conversions of standard landrovers and are much wanted by the racing crowd over seas.

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