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Thread: Isuzu gearbox ratios

  1. #1
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    Isuzu gearbox ratios

    Thought it may be useful to have a sticky with Isuzu gearbox ratios.

    Here are some 6 speed boxes some may be too big for our use

    Gearbox| Isuzu ?? | 1st- | 2nd- | 3rd- | 4th- | 5th- | 6th- | 7th- | rev
    MYY-6S | NPR400 |5.979|3.434|1.862|1.297|1.000|0.750|xxxxx|5.701
    MZW-6P | ???4x4 |6.615|4.095|2.358|1.531|1.000|0.722|xxxxx|6.615
    Last edited by Lotz-A-Landies; 30th August 2014 at 08:15 AM.

    You won't find me on: faceplant; Scipe; Infragam; LumpedIn; ShapCnat or Twitting. I'm just not that interesting.

  2. #2
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    Here is a list of the ratios Dougal posted on 4BTswaps a while back that I had saved


    MSA-5D
    1st - 5.670
    2nd - 3.415
    3rd - 1.900
    4th - 1.331
    5th - 1.000
    R - 5.680

    MSA-5G,
    5.788:1
    2.998:1
    1.594:1
    1.000:1
    0.776:1
    5.798:1

    MSA-5P,
    5.788:1
    2.998:1
    1.735:1
    1.000:1
    0.776:1
    5.798:1

    MSA-5R,
    4.987:1
    2.998:1
    1.594:1
    1.000:1
    0.728:1
    4.774:1

    The 5G would be the best option in a 110 tho the 5P which I have here may well be a better option in a truck or 101 or for hauling loads

    I have designed my own adaptor to fit the LT230 to the MSA I just need to pull my finger out and get the parts cut to see how it goes

    As for making the spud shaft I have that sorted as well as a shifter

  3. #3
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    Had to take a pic as the info was password protected The bellhousing would need to be changed

    AM
    Attached Images Attached Images

  4. #4
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    This list could do with some editing:

    For strength:
    MSB = 88mm gear centres (weakest box) and was fitted to 4BC2 and 4JB1T engines.
    MSA = 97mm gear centres fitted to most B series Isuzu's.
    MXA = 100mm gear centres (strongest box) fitted to most H series Isuzus but also 4BD2T.

    The mbp-6p is:
    1st 6.378:1
    2nd 3.627:1
    3rd 2.239:1
    4th 1.452:1
    5th 1.000:1
    6th 0.787:1

    MSA5G,
    5.788:1
    2.998:1
    1.594:1
    1.000:1
    0.776:1
    5.798:1

    MSA5P,
    5.788:1
    2.998:1
    1.735:1
    1.000:1
    0.776:1
    5.798:1

    MSA5R,
    4.987:1
    2.998:1
    1.594:1
    1.000:1
    0.728:1
    4.774:1

    MXA5R
    4.987:1
    2.870:1
    1.594:1
    1.000:1
    0.728:1
    4.774:1

    MXA-6R (I don't know year).
    1st 4.987:1
    2nd 2.870:1
    3rd 1.684:1
    4th 1.000:1
    5th 0.728:1
    6th 0.626:1
    rev 4.774:1

    Isuzu MBP-6P
    1st 6.378:1
    2nd 3.627:1
    3rd 2.239:1
    4th 1.452:1
    5th 1.000:1
    6th 0.787:1
    rev 6.595:1

    MYY-6P
    5.979:1
    3.434:1
    1.862:1
    1.297:1
    1.000:1
    0.774:1
    5.701:1

    MYY-6S
    5.979:1
    3.434:1
    1.862:1
    1.297:1
    1.000:1
    0.75:1
    5.701:1

    MYY-5P
    5.315:1
    3.053:1
    1.655:1
    1.000:1
    0.721:1
    5.068:1

    Isuzu Mzz-6U
    1st- 6.369
    2nd- 3.767
    3rd- 2.234
    4th- 1.442
    5th- 1.000
    6th- 0.782
    rev- 6.369

    Model MSB-5S
    Description The transmission is one horizontal manual transmission, which is manufactured in strict with Japanese ISUZU standard. It can be used on light-duty truck,minibus etc.
    Specification Matching Engine: 4JB1
    Ratio:
    1: 5.016
    2: 2.672
    3: 1.585
    4: 1.000
    5: 0.770
    Rev: 4.783
    Central Distance: 88
    Torque: 230


    4JB1 fitted with MSB-5S
    4BE1T fitted with MSB-5M
    4BC2 fitted with MSB-5S (truck at home)
    4HF1 fitted with MSA-5R (wymer brothers)
    NHR (poss 4JB1) with MSC-5
    MSA-5D and MXA-5D appear functionally identical

    MBG-6T fitted to 6HE1 1992 FRR32
    MBP-6P fitted to 4HE1TC 1998 NPR70P
    MXA-6R fitted to 4BD2TC 1994 NPR65
    MXA-6R fitted to 4HG1 1996 NPR71
    MLD-6A fitted to 6BD1 FRT12
    MBG-6P fitted to 6BD1 1987 FSR11
    MBG-6P fitted to 6HE1 1995 FSR32
    MYY6 no truck listed.
    MBG-6U fitted to 6HE1 1994 FRR32K
    6 speed fitted to 4HE1T 1998 NPR70
    MXA-6R fitted to 4HG1 NPR71P
    MBG-6P fitted to 6BD1 1989 FSR11HG

  5. #5
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    Quote Originally Posted by Ancient Mariner View Post
    Had to take a pic as the info was password protected The bellhousing would need to be changed

    AM
    MXA-6S A six speed double overdrive! What is it out of?

    You won't find me on: faceplant; Scipe; Infragam; LumpedIn; ShapCnat or Twitting. I'm just not that interesting.

  6. #6
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    Quote Originally Posted by Lotz-A-Landies View Post
    MXA-6S A six speed double overdrive! What is it out of?
    As far as I can determine N series about 2000 The 4x4 has a cast iron bell housing instead of aluminium and use MXA 5R boxes


    AM

  7. #7
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    Quote Originally Posted by Dougal View Post
    <snip> ...
    MYY6 no truck listed.
    ... <snip>
    You will find that the MYY are in the current MY14 range.
    Isuzu N Series | Light duty truck - Isuzu Australia

    MYY-6S (& AMT): (4500-7500GVM/8000-11000GCM)
    1st 5.979 2nd 3.434 3rd 1.862 4th 1.297 5th 1.000 6th 0.750 Rev 5.701
    1. NNR 200
    2. NPR-250
    3. NPR-275
    4. NPR-300
    5. NPR-400

    MZZ-6F (& AMT): (8700GVM/12200GCM)
    1st 6.369 2nd 3.767 3rd 1.966 4th 1.355 5th 1.000 6th 0.782 Rev 6.369
    1. NQR-450

    MYY-5S (4500GVM/7000GCM)
    1st 5.979 2nd 3.434 3rd 1.752 4th 1.000 5th 0.795 Rev 5.701
    1. NLS-200 AWD

    MYY-5T: (4500-5500GVM/7000-8000GCM)
    1st 5.315 2nd 3.053 3rd 1.655 4th 1.000 5th 0.721 Rev 5.068
    1. NLR-200
    2. NLR-275
    3. NPS-250 4X4
    4. NPS-300 4X4
    AMT suffix means: Automated Manual Transmission (AMT) with both fully automatic
    and clutchless manual operation modes.

    You won't find me on: faceplant; Scipe; Infragam; LumpedIn; ShapCnat or Twitting. I'm just not that interesting.

  8. #8
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    Hello everyone,

    I am new here and will appreciate any help.

    I just brought back a 6x6 110 Perentie from Sydney that I've bought from Graysonline.
    Seams a good truck except the 4 speeds gear box .
    Too much difference between 3rd and 4th and definitly need at least one more gear.

    Lotz-A-Landies , do you know if the gear boxes that you mention would fit in my truck ?
    And a 6 speed double over-drive would be even better I reckon.

    Thanks

  9. #9
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    Quote Originally Posted by Rand Lover View Post
    Hello everyone,

    I am new here and will appreciate any help.

    I just brought back a 6x6 110 Perentie from Sydney that I've bought from Graysonline.
    Seams a good truck except the 4 speeds gear box .
    Too much difference between 3rd and 4th and definitly need at least one more gear.

    Lotz-A-Landies , do you know if the gear boxes that you mention would fit in my truck ?
    And a 6 speed double over-drive would be even better I reckon.

    Thanks
    The problem you have is the lt95 gearbox/t-case you have has a single casing. You need the t-case to drive the rearmost axle.

    There are people who have cut the casing in half to use the t-case only. So yes, you can fit the boxes mentioned, however there will be some custom work to mate it with the t-case part of your lt95.

    To fit the box you will also need to fit a truck bellhousing to the back of the engine and sort a custom shifter mechanism.

  10. #10
    Join Date
    Jan 2015
    Location
    Darwin
    Posts
    10
    Thanks Isuzurover.

    Sounds a bit of work that way.

    Any gear box that could fit right in without any mods ?

    Or an overdrive maybe ?

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