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Thread: D2 TD5 with 6HP26 from D3,D4 or RRS

  1. #1
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    D2 TD5 with 6HP26 from D3,D4 or RRS

    Well I shouldn't be thinking about this as it would be more time and expense and dramas but thought i'd ask the question.

    Does anyone have any idea if the bell housing from a 4HP22 out of a TD5 D2 would bolt on the front of the 6HP26 from a D3? And if it does what are the chances of the LT230 bolting onto the back if it?

    I'm guessing the ECU, or BCU would probably need to speak to the transmission computer, but that is well... only electronics.

    Assuming the over drive of the 6HP26 is greater than the 4HP22 this could work for me.

    It might sound stupid, but what if it works!

  2. #2
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    Ask Peter Bell from Bell Transmissions in the UK.
    Has a lot of knowledge in the field of Land Rover & mixing engines/transmission/transfer cases & bodies.

    Does great work & has probably tried this combo.

    Cheers

  3. #3
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    there are two overdrive ratios, one beyond anything a standard D2 will pull.

    4.171- 2.34 - 1.521 - 1.143 - 0.867 - 0.691

    big jump from 4-5, nice to have such a low first though,,
    the box seems to last ok in Latte land,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
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    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
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    '16.5 RRS SDV8
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    1988 Isuzu Bus. V10 15L NA Diesel
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  4. #4
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    Quote Originally Posted by Jazzman View Post
    Well I shouldn't be thinking about this as it would be more time and expense and dramas but thought i'd ask the question.

    Does anyone have any idea if the bell housing from a 4HP22 out of a TD5 D2 would bolt on the front of the 6HP26 from a D3? And if it does what are the chances of the LT230 bolting onto the back if it?

    I'm guessing the ECU, or BCU would probably need to speak to the transmission computer, but that is well... only electronics.

    Assuming the over drive of the 6HP26 is greater than the 4HP22 this could work for me.

    It might sound stupid, but what if it works!
    Doesn't sound stupid to me. I've wondered the same thing, but for the 6HP26 out of a Falcon or Territory, as there are more of those around. Same issue with the LT230 I'd imagine.
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
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  5. #5
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    We need the X model I think,, the ones out of the territory are for two wheel drives,,
    The box would be the same,, just the mounts maybe,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!


    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]

  6. #6
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    Control would be a problem, doubt you'd get the falcon/territory trans ecm to talk to the engine ecm. Have to go aftermarket if someone even made such a thing???
    What do they use to control the auto boxes they are swapping into the 79 series cruisers??? Something similar may work?

    Power handling would not be a problem, Wikipedia says it handles 600nm!

  7. #7
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    Quote Originally Posted by CU55TM Disco View Post
    Control would be a problem, doubt you'd get the falcon/territory trans ecm to talk to the engine ecm. Have to go aftermarket if someone even made such a thing???
    Has to be someone who's done it, surely. The Ford trans can't be that far from the LR one, given the 2.7 engine is to all intents and purposes the same. I never thought it would be a bolt up, but it would have to be worth exploring.

    Quote Originally Posted by CU55TM Disco View Post
    What do they use to control the auto boxes they are swapping into the 79 series cruisers??? Something similar may work?
    The only 79 series conversion I've seen was a Chev Silverado box. Not saying the ZF hasn't been done, mind.
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  8. #8
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    They use the auto box from an 80 series cruiser behind the v8.

    Turns out they use a compushift to control out.

  9. #9
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    Comforting to know i'm not the only one who thinks this might be a worth while idea. Interesting someone mentioned having a lower first, i actually want a higher highway gear But i guess with this transmission i might be able to go back to a 1.2 transfer case and solve the bottom end issue with more gears in the auto.

    Ideally the input shaft from the 4HP22 could go straight into the 6HP26 (or the could be the same to begin with) with the bellhousing. Imagine that for a coincidence?!

    Highly unlikely. Wish i had a broken 6HP26 to play with, i've already got a broken 4HP22.

  10. #10
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    Quote Originally Posted by Pedro_The_Swift View Post
    there are two overdrive ratios, one beyond anything a standard D2 will pull.

    4.171- 2.34 - 1.521 - 1.143 - 0.867 - 0.691

    big jump from 4-5, nice to have such a low first though,,
    the box seems to last ok in Latte land,,
    ratios for the 4HP22 are: 2.480, 1.480, 1.000 and 0.728

    0.728 isn't too far off from the 6 speed's 0.691.
    Whether or not a std tune TD5 can pull that gearing is something I have no experience with .. but.

    if you use a gearing calculator, and assume 235/70 16 tyres and a 1.000 transfer ratio, the 4 speeder gives 103.3km/h at 2000RM, and the 6 speeder gives 108.8km/h.
    change transfer gear to 1.2 and again at 2000RPM; 4th in the 4 speed = 85.5km/h and 6th in the 6speed = 90.0km/h


    With such a low 1st gear, you probably wouldn't need the 1.2 transfer gear, eg. for uphill starts or towing.

    off road in first low is probably the real benefit to such a conversion.
    if you assume the LT230's 3.32:1 ratio is maintained:
    for every 1000RPM: first low in the 4speed = 4.76 k/hr whereas first low in the 6 speeder is only 2.83k/hr.
    Arthur.

    '99 D1 300Tdi Auto
    '03 D2 Td5 Auto

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