Thread: Transmission Reliability

All good Harlie.

Originally Posted by harlie

even that's not entirely correct. In the diesels, the ZF 6HP26 was replaced with the ZF 8HP70 (8 speed) when the 3.6 TDV8 was replaced with the 4.4 (2010?). Since I have no interest in petrol models, I'm not sure what went on in the petrol side.

As interest the 6HP26 was replaced with the 6HP28 (higher rated) in the SDV6 Disco4 for a while before it got the 8 speed. For those that fixate on max torque ratings, the 6HP26 is rated to max of 600nm with means that the 3.6 at 640nm standard is going to destroy it - which is funny because when they remap the 3.6 to 800nm the box seems fine, it's the engine that self destructs...

I was under the impression that the HP6 was up to the job of handling the 3.6 diesel (you would wonder why they matched the box with that motor if it wasn't up to it?).
My 3.6 is remapped and I generally drive it pretty steady with no foot planting, so max horses not delivered into the box, and I get trans oil changed regularly, but at 240k the HP6 has completely imploded and now lies waiting for a transplant of rebuilt box.
I would be interested in knowing whether the 6HP28 was a completely different box or just a HP26 with some internal modifications that perhaps my trans person could upgrade into the replacement HP26?

Originally Posted by harlie

even that's not entirely correct. In the diesels, the ZF 6HP26 was replaced with the ZF 8HP70 (8 speed) when the 3.6 TDV8 was replaced with the 4.4 (2010?). Since I have no interest in petrol models, I'm not sure what went on in the petrol side.

As interest the 6HP26 was replaced with the 6HP28 (higher rated) in the SDV6 Disco4 for a while before it got the 8 speed. For those that fixate on max torque ratings, the 6HP26 is rated to max of 600nm with means that the 3.6 at 640nm standard is going to destroy it - which is funny because when they remap the 3.6 to 800nm the box seems fine, it's the engine that self destructs...

I was under the impression that the HP6 was up to the job of handling the 3.6 diesel (you would wonder why they matched the box with that motor if it wasn't up to it?). (land Rover!! !@#$%
My 3.6 is remapped and I generally drive it pretty steady with no foot planting, so max horses not delivered into the box, and I get trans oil changed regularly, but at 240k the HP6 has completely imploded and now lies waiting for a transplant of rebuilt box.
The trans re-builder advises me that ALL 6HP26's that he rebuilds, now get the "Aussie pack", which is a big upgrade to the clutch packs and internals (probably what is in the 6HP28) as well as modifying the torque convertor to handle the extra torque, and I assume it is what they stick into the boxes that go behind the turbo big Fords that were sold with the 6HP26.

Those Aussie upgrades came courtesy of Ford when they put the box in the Falcons and Gt's etc . Aussies being Aussies kept boosting the power till things broke, but then found better materials etc to make the box stronger, better input Shafts, etc There are a lot of performance parts for these boxes here. They will handle up to 1000hp

ZF 6HP26 Performance Upgrades