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Thread: Replace ZF6 HP26 with HP28 TRANSMISSION

  1. 26th October 2013, 10:11 PM #1
    TDV6
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    Replace ZF6 HP26 with HP28 TRANSMISSION

    I am having issues with the auto box in my 2.7 TDV6, and was wondering if anyone has replaced their HP26 box with the later HP28 or an 8 speed box.

    I will go down the Fuchs ATF 4400 route before ordering a new box, however if I am up for 8K and a HP28 will work with the 2.7L TDV6 then I think it would be the way to go.

    We have replaced the ATF 2 month's ago using ZF Lifeguard and added Dr Tranny, without van on all is fine, but spits the dummy once the van is attached.

    Ryall
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  2. 27th October 2013, 12:45 AM #2
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    Slunnie
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    Is the ATF cooler clear so the air can get through all of it?
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
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  3. 27th October 2013, 06:29 AM #3
    Graeme
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    A different canbus architecture was implemented for the 2010 D4 so the gearbox ecu, which is located inside the gearbox rather than in the vehicle, is likely to be the stumbling block to fitting the HP28 or the 8-speed.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  4. 27th October 2013, 07:40 AM #4
    CaverD3
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    I think the HP28 was the one used in the V8 D3 all year models. More robust components but not sure if the mechatronics are the same. You could ask ZF exactly what the differences are.
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  5. 27th October 2013, 08:45 AM #5
    Graeme
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    I thought the HP26 was upgraded to the 28 for the 3.0 but even if it was available for the old canbus, there might not be software suitable for use with the TDV6 with its dfferent torque and power characteristics to the petrol V8.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  6. 27th October 2013, 11:58 AM #6
    TDV6
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    Thank you all, yes the ATF cooler is in clear cold air flow about 2 inches in front of radiator, was told by one auto trans tech that oil can quite readily reach 170 degrees C when towing.

    Will be asking questions of ZF etc of differences between HP26 AND HP28. looking at ZF pdf file there appear minimal changes between them.

    PDF file copied from bbyer gallery see ; DISCO3.CO.UK Photo Gallery - ZF 6HP26 Automatic Transmission in LR3

    Thanks,

    Ryall
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  7. 27th October 2013, 03:48 PM #7
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    TerryO
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    I'd be interested to find this out as I reckon our auto is not long from giving up the ghost as well.
    Cheers,
    Terry

    D1 V8 (Gone)
    D2a HSE V8 (Gone)
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  8. 27th October 2013, 04:00 PM #8
    Graeme
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    As I recall the 28's torque converter can be locked at lower revs to allow better use of the 3.0's low-down torque. With the gear ratios identical there's not going to be much difference.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  9. 27th October 2013, 05:26 PM #9
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    jonesy63
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    IIRC, the 6HP26 was on the D3 2.7/D4 2.7, 6HP26X was in the D3 4.4 and 6HP28 was in the D4 3.0. I doubt very much if they're interchangeable.
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  10. 27th October 2013, 07:56 PM #10
    CaverD3
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    If the mechatronics and or transmission ECU could be swapped it may be possible.
    Even if you get a D3 V8 one the ecu would need to be re-flashed (at the correct temp)
    It is something that has not been done before I would think but if you want to be a guinea pig?

    A no on disco3 but not much response or feedback

    DISCO3.CO.UK - View topic - D4 ZF 6HP28 into D3 is it Posible !?!

    There seems to be little definitive info as to whether the V8 trans mission was changed during the D3s run.

    Sniegy might be able to find out.
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