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Thread: Series Gearbox

  1. #1
    Join Date
    Oct 2014
    Location
    Northern NSW.Australia
    Posts
    568

    Series Gearbox

    To open a can of worms,
    which is, in YOUR opinion, is the strongest, best SERIES gearbox, and WHY.
    Sorry.

    whitehillbilly

  2. #2
    Join Date
    May 2008
    Location
    Bundaberg Qld
    Posts
    4,829
    Late 2A with the (supposed) down side of not having syncro on 1st & 2nd. I don't mind as it stops most people driving my Series vehicles.
    PaulT

    REMLR 256 / SLOw 4 (P)

    (some) W/Shops/trailers & GS's

    97 D1 TDi A (Pop's DD)
    07 Territory (Nan's DD)
    91/96/97 D1's spares
    86 RRC 3.5 A (spare DD)

    lots of Series various

  3. #3
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    18,952
    The Series box originated when Rover went to four speeds in 1932. It was fitted with synchromesh on the top two gears in 1939, and was fitted to all Series Landrovers except Stage 1. Throughout production it had progressive improvements to fix issues that appeared in use, but without significant changes in design.

    However, with the very last of the Series 2a (home market station wagons only) the box was extensively redesigned to have synchromesh on all gears. Since this box needed to be the same size as its predecessor to avoid too much other redesign, the new box not only came with the inevitable issues with any new design, but some compromises were needed to fit everything in. It did not help that this was happening as the Leyland disease was taking hold.

    From this, it would be expected that there was a marked drop in strength and reliability of the box with the start of the all synchro box, and experience has confirmed this. Some believe that the last of the S3 boxes had regained the strength and reliability of the last of the 2a boxes, but this is not universally accepted.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  4. #4
    Join Date
    May 2006
    Posts
    392
    Quote Originally Posted by pop058 View Post
    Late 2A with the (supposed) down side of not having syncro on 1st & 2nd. I don't mind as it stops most people driving my Series vehicles.
    I reckon would be a good idea if everyone who drives manual geared vehicles should have to learn to drive boxes without synchromesh. There would then be a lot less abuse of synchronisers due to some people having no idea of the unnecessary wear and tear on them due to their driving styles. Last year I acquired a S2 ute. When gearbox eventually needs to come out to do clutch and /or bearings get too noisy, hope to replace it with later S2A type which is apparently more reliable but with ratios spread out more. Especially the slightly lower speeds in first and reverse would be overall an improvement with my uses for it around farm. Also a good place for teaching visitors how to drive gearbox with no synchro in first and second.

  5. #5
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    18,952
    The ratios were changed on later 2a boxes to have lower first and reverse, and more spread on two and three, but this was compensated for by raising low range so that the same maximum reduction was attained, so the only was of getting a greater overall reduction is to use a later box with an earlier transfer case. But not too early, so you get the later bigger diameter intermediate shaft.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  6. #6
    Join Date
    Jan 1970
    Location
    Narre Warren South
    Posts
    3,059
    Thread in 'sticky's' above.

    Series Gearbox ID

    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '60 SII 109 ute (gone)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

  7. #7
    Join Date
    Nov 2008
    Location
    Black Mountain, Eastern Vic.
    Posts
    521
    I believe from reading various posts and websites that the S3 Suffix 'D' box had most of the design 'weaknesses' fixed, with bigger shafts and grooves removed.
    I want to believe it because I own one.
    Happy to be corrected

    Terry
    56 86" 2.0 P UK built, driven here overland.
    63 88" 2.25 P Canvas top. found in a hidden gully.
    80 109" 2.6 P ex Army GS, saved from the scrappie.
    95 300tdi 130 Single cab tray.

  8. #8
    Join Date
    Jan 1970
    Location
    Canberra Australia
    Posts
    13,207
    While the series 2a box may have been stronger, the series 3 box was good enough for the job it was designed for. My very early series 3 was my everyday driver for may years and used for quite a bit of towing of cars - did axles, did wheel bearings, did UJs and clutches but never had problems with the gearbox.

    My previous everyday driver as a 56 series 1 86 which I drove for 8 years so I had the gearbox down pat but I have to say driving the series 3 gearbox and steering wise was a breath of fresh air compared to the series 1.

    So if given the option and using a Series as intended I would always go for the series 3 box but there are always other considerations.

    Garry

  9. #9
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    10,927
    I think the LT95 was by far the best gearbox used in a series.
    Cheers
    Slunnie


    ~ Discovery II "Storm" ~ ~ Series IIa 6cyl ute ~ ~ Series II V8 ute ~


    D2Au - The Australian Discovery2 owners group with 400 members!

  10. #10
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    18,952
    As Garry comments, the Series box has always been quite adequate. Most box failures result from very bad driving or poor maintenance or repair with one major exception. This is that some adapters for fitting a Holden motor are not made accurately enough, and the result of this is inevitably a failure of the gearbox, usually blamed on th e gearbox, not the misalignment. This single issue is likely to be responsible for the majority of serious issues with Series gearboxes in Australia.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

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