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Thread: diff ratios

  1. #1
    Join Date
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    diff ratios

    When we do the swap of a 4BD1 + Isuzu 5 speed gearbox into the 1991 3.9 V8 Range Rover, will we need to change diff ratios. If so will the diffs from a 300TDI disco wreck [that we are wrecking] be suitable for the Range Rover??? Thanks guys.

  2. #2
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    Same ratio, no benefit to be had.

  3. #3
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    diff ratios should be the same

    I ran into issues with the Trailing arm brackets when installing a disc to disco RRC diff into my 300tdi so you might have issues going the other way but this will depend on the year of the RRC

    http://www.aulro.com/afvb/technical-...r-install.html

    The above thread has some photos from my install

    The above won't matter if you are only doing centres but remember there would be axle and I believe cv changes if you go down that path

  4. #4
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    Ashcroft Transmission Ratio site is a excellent source for any ratio questions

    AM

  5. #5
    lokka Guest
    Only difference if you swap out the whole housings and arms is the size of the pin in the rear bushes in the chassis

    If it was me I would use the arms and bushes front and rear from the disco into the rangie even the A frame in the rear swap it for the disco one or at least the ball joint if its in better condition

    Next step is that you will need to run a taller tyre like a 235x85x16 or similar to get the best out of having the isuzu as the 33 inch size tyre works best with the motor ratio combo

  6. #6
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    Higher ratio lt230 works best.

  7. #7
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    Combination of both I think, 1.003 transcase and at least a 33" Tyre works very well together

  8. #8
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    Quote Originally Posted by Vern View Post
    Combination of both I think, 1.003 transcase and at least a 33" Tyre works very well together
    ...only with a turbo....


    jc
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈

  9. #9
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    How could anyone in their right mind live without one

  10. #10
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    AS the time is getting closer any one want to polish up the crystal ball with a prediction 3.0 diffs 1.003 TC and 32" tyres MXA 5r)

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