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  1. #31
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
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    Quote Originally Posted by DoubleChevron View Post
    ........
    Oh, and the LT230 ..... I think this must be a later one from a Disco 2. It seems to be far quieter .... Did they change the gearsets in them to make them quieter in the late ones? You get nowhere near the transfer case howl I'm used too

    seeya
    Shane L.
    According to my memory (sometimes fallible), yes. They changed to smaller, more closely spaced teeth. But possibly just very slightly better aligned gears than you are used to.
    John

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

  2. #32
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    Quote Originally Posted by JDNSW View Post
    According to my memory (sometimes fallible), yes. They changed to smaller, more closely spaced teeth. But possibly just very slightly better aligned gears than you are used to.
    It may well be in my head. but it certainly does seem to be a LOT quieter.

    Best year of lt230 ? | Pirate 4x4

    They talk about something called an LT230Q here. I wonder if this is what I've ended up with.



    The gears are quite different an they reckon a lot weaker over on that forum. Oh well, we'll see how it works out in time

    seeeya
    Shane L.
    Proper cars--
    '92 Range Rover 3.9V8 ... slugomatic
    '92 Range Rover 3.8V8 ... 5spd manual
    '85 Series II CX2500 GTi Turbo I :burnrubber:
    '63 ID19 x 2 :wheelchair:
    '72 DS21 ie 5spd pallas
    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual :zzz:

  3. #33
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    Now I dont wanna speak Illawarra, but how much can a Koala Bear?
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    I've heard stories of the Q gears. Never seen one in person.
    Images would convey the change in tooth count to reduce whine.

    when you increase tooth count on helical gears or involute gears for the same diameter, the root becomes weaker.

    Yes, you can manufacture out of better material, and in racing that would work - because you'd be doing regular inspection/testing.

    on a vehicle designed to carry load and do long intervals between services... meh.

    Some people can't abide the noise. You'll see them pondering about.

    If you have the chance to swap it for a non q box, then maybe. but why not just install it and let it brak in it's own time, then replace it if required.

    Some people hav no issues with theirs, so I can only imagine there is *some* kind of omission of mechanical sympathy, or there truly was a batch of faulty gears / hardening etc.

    You'd have thought though - by now most of those failed units would be long scrapped.
    Roads?.. Where we're going, we don't need roads...

  4. #34
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    Quote Originally Posted by Mercguy View Post
    I've heard stories of the Q gears. Never seen one in person.
    Images would convey the change in tooth count to reduce whine.

    when you increase tooth count on helical gears or involute gears for the same diameter, the root becomes weaker.

    Yes, you can manufacture out of better material, and in racing that would work - because you'd be doing regular inspection/testing.

    on a vehicle designed to carry load and do long intervals between services... meh.

    Some people can't abide the noise. You'll see them pondering about.

    If you have the chance to swap it for a non q box, then maybe. but why not just install it and let it brak in it's own time, then replace it if required.

    Some people hav no issues with theirs, so I can only imagine there is *some* kind of omission of mechanical sympathy, or there truly was a batch of faulty gears / hardening etc.

    You'd have thought though - by now most of those failed units would be long scrapped.

    I'll put the car back up on the ramps tonight and check the serial number to see what I have. I need to chekc the oil levels now the car has been driven around a bit and try to hook up the handbrake able (that is currently just to short in adjustment to hook up. I hope there is adjustment there 'cos I'm betting I have a Disco 2 cable and adjuster there.

    seeya,
    Shane L.
    Proper cars--
    '92 Range Rover 3.9V8 ... slugomatic
    '92 Range Rover 3.8V8 ... 5spd manual
    '85 Series II CX2500 GTi Turbo I :burnrubber:
    '63 ID19 x 2 :wheelchair:
    '72 DS21 ie 5spd pallas
    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual :zzz:

  5. #35
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    Ok so the transfer case is a 36D .... So given the list stolen from another website.

    Prefix Type Ratio Typical Applications
    12D R 1.667
    13D R 1.410
    14D R 1.003
    15D R 1.192
    20D T 1.667 Defender 4 Cyl Non Tdi
    22D T 1.410 Defender 4 Cyl bar 2.5 Diesel Nat Asp.
    25D T 1.410 Defender 110 V8 With LT85 Gearbox
    26D T 1.003 RR Classic with 3 speed Chrysler Auto
    27D T 1.192 RR Classic up to 1985
    28D T 1.222 RR Classic 1986 0n & Disco 1
    29D T 1.192 Defender 90 V8 with LT85 Gearbox
    32D T 1.222 4 Cyl & V8 3.5 fitted With LT77S Box
    34D T 1.410 Discovery V8 & 2.0 Mpi
    36D Q 1.211 Discovery
    37D Q Discovery
    38D Q 1.211 Defender V8 4.0
    40D Q 1.211 Japan / South Africa
    41D T 1.211 Disco 2 With Diff Lock Stud
    42D T 1.211
    43D 1.410 Defender TD5


    I have a LT230Q .... I really like it. I was always going to upgrade to 24spline disco diffs to get rid of all the driveline lash (which there is LOTS of!). I'll be damned, 95% of the driveline lash has dissapeared like magic with this transfer case.... And it IS much quieter (even with no console in and a big hole in the floor where the gearshift gasket goes). I reckon its as refined as the borg warner transfer case ... but I'd need to drive one back to back with this to verify.

    Those with automatics probably don't really notice the driveline lash. Well throw some "L" plates in the thing and let your daughter drive one with a manual gearbox and see how you go

    seeya,
    Shane L.
    Proper cars--
    '92 Range Rover 3.9V8 ... slugomatic
    '92 Range Rover 3.8V8 ... 5spd manual
    '85 Series II CX2500 GTi Turbo I :burnrubber:
    '63 ID19 x 2 :wheelchair:
    '72 DS21 ie 5spd pallas
    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual :zzz:

  6. #36
    JDNSW's Avatar
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    Quote Originally Posted by Mercguy View Post
    ......
    when you increase tooth count on helical gears or involute gears for the same diameter, the root becomes weaker.
    .....
    Yes - but irrelevant if a) it had excess strength anyway or b) changes were made to other factors such as the alloy used etc.

    My impression is that the LT230 is extremely robust and can withstand far more power than any of the factory engines attached to it. Of course that does not mean it can't be broken if you go rockhopping with 36" tyres and a lead foot!
    John

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

  7. #37
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    Quote Originally Posted by DoubleChevron View Post
    Those with automatics probably don't really notice the driveline lash. Well throw some "L" plates in the thing and let your daughter drive one with a manual gearbox and see how you go

    seeya,
    Shane L.
    HAHA. well, let's see how the drivetrain is in 12 months
    Roads?.. Where we're going, we don't need roads...

  8. #38
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    Quote Originally Posted by Mercguy View Post
    HAHA. well, let's see how the drivetrain is in 12 months
    She'll be right mate ...... She hasn't driven it much other than around bush tracks. I need to fit another indicator switch to it (you have to hold it on around corners) ... that's the 3rd dead one I have here now. The drivers window has jammed and I need to swap a new mechanism in .... and the heater fan has died. The heater fan is a bugger, as its a BIG job to pull that out. I'll do that this weekend if the weather is so bad I cant start throwing up the leanto.

    seeya,
    Shane L.
    Proper cars--
    '92 Range Rover 3.9V8 ... slugomatic
    '92 Range Rover 3.8V8 ... 5spd manual
    '85 Series II CX2500 GTi Turbo I :burnrubber:
    '63 ID19 x 2 :wheelchair:
    '72 DS21 ie 5spd pallas
    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual :zzz:

  9. #39
    350RRC's Avatar
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    Quote Originally Posted by DoubleChevron View Post
    Ok so the transfer case is a 36D .... So given the list stolen from another website.

    Prefix Type Ratio Typical Applications
    12D R 1.667
    13D R 1.410
    14D R 1.003
    15D R 1.192
    20D T 1.667 Defender 4 Cyl Non Tdi
    22D T 1.410 Defender 4 Cyl bar 2.5 Diesel Nat Asp.
    25D T 1.410 Defender 110 V8 With LT85 Gearbox
    26D T 1.003 RR Classic with 3 speed Chrysler Auto
    27D T 1.192 RR Classic up to 1985
    28D T 1.222 RR Classic 1986 0n & Disco 1
    29D T 1.192 Defender 90 V8 with LT85 Gearbox
    32D T 1.222 4 Cyl & V8 3.5 fitted With LT77S Box
    34D T 1.410 Discovery V8 & 2.0 Mpi
    36D Q 1.211 Discovery
    37D Q Discovery
    38D Q 1.211 Defender V8 4.0
    40D Q 1.211 Japan / South Africa
    41D T 1.211 Disco 2 With Diff Lock Stud
    42D T 1.211
    43D 1.410 Defender TD5


    I have a LT230Q .... I really like it. I was always going to upgrade to 24spline disco diffs to get rid of all the driveline lash (which there is LOTS of!). I'll be damned, 95% of the driveline lash has dissapeared like magic with this transfer case.... And it IS much quieter (even with no console in and a big hole in the floor where the gearshift gasket goes). I reckon its as refined as the borg warner transfer case ... but I'd need to drive one back to back with this to verify.

    Those with automatics probably don't really notice the driveline lash. Well throw some "L" plates in the thing and let your daughter drive one with a manual gearbox and see how you go

    seeya,
    Shane L.
    I wouldn't lose sleep about the size of the teeth in that TC.

    There's a way bigger thread on pirate where Buckon....? goes all out building an LT 230 after blowing up in the Hammers race. All anyone would ever need to know.

    The point is you have a 3.9, auto, not doing the rocks or desert racing with a worked LS, just keep the oil up to it and enjoy. If It blows up put another 230 in, it's not like a big (body off, get the electronics to talk) deal.

    I had 10 spline diffs and axles in my POS for years and never had a problem behind the 350. Used to get floored on the bitumen all the time.

    Yes I looked after everything in low range, rocks, etc to avoid shock loads.

    cheers, DL

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