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Does this happen in Sport mode as well as ‘normal’ mode? Are all the brake lights working? Phil

Not sure if this is of any use : Phil

Possibly a problem with the Manual/Sport switch on the gear selector lever? Phil

Possibly number 5 on the list of standard 6HP26 failures? https://www.landyzone.co.uk/land-rover/tdv8-56-plate-gearbox-knackered-options.330242/#post-4260591 Phil

I once re-manufactured a transmission for a guy who had been driving round with his Range Rover transmission in failsafe mode (i.e. stuck in 4th gear) for 9 months ! If any parts inside the inhibitor switch are broken then you can’t get replacements. However, as a new switch costs £600 from...

You could first check that the pins look okay in the connector but, failing that, you could drill out the seven rivets and check that the five wiper fingers are all in place and the copper strips are clean enough to allow a good electrical contact Phil

It’s important to distinguish between the aerodynamic resistance due to drag, which is a force, and the power required to overcome that drag Power = Force x Velocity So, the power required at the wheels to overcome the aerodynamic drag force is directly proportional to the drag coefficient and...

Drag force is proportional to the square of the speed. Drag power is proportional to the cube of the speed. 100bhp for 100mph would require 800bhp for 200mph. Phil

Taking your average family runabout as an example, the Bugatti Veyron has a drag coefficient of 0.36 and a frontal area of 2.07m^2 (according to Wikipedia). At 250mph (i.e. 111.76m/s) the aerodynamic drag will therefore be 0.5*1.23*0.36*2.07*111.76^2 - assuming an air density of 1.23kg/m^3...

Worse than that, drag is a force so the power requirement has to be multiplied by the speed again, so the power requirement to shove a vehicle through the air is proportional to the cube of the speed. Phil

The NV225 transfer box ECU isn’t coded to the vehicle so, yes, it’s just plug-n-play. There were several software updates over the years so its part number changed from : IGG 000100 to IGG 500040 to NNW 500440 to IGG 500100 to IGG 500101, so one of the later ones would be better. A new IGG...

I admire your optimism but I’m afraid it’s much more likely to be your transmission playing up than the transfer box. Next time you lose drive put the gear selector into Park with the engine still running and the handbrake off and see if the park lock holds the vehicle. If the vehicle will roll...

John Mackie’s transmission workshop in Tollcross is a highly respected ZF specialist. Mackie Automatic Transmissions 95 Causewayside Street Glasgow G32 8LT Phil

The bushes aren’t expensive (a full set containing all 14 costs around £60) and the stator is the first thing to come out of the transmission, along with the oil pump, when it is disassembled. It therefore isn’t necessary to rebuild the whole transmission to replace the stator bush. The...

Could be that the rear stator bush has worn (common fault with the 6HP26) and it’s allowing the hydraulic pressure for the E-clutch to escape. The E-clutch is used in 4th, 5th & 6th gears so the mechatronic defaults to 3rd gear if it senses the clutch slipping. Phil

If you’re resetting the adaptions because new software is being flashed then just follow the appropriate adaption drive cycle afterwards until the new solenoid settings are learned. Don’t change the fluid at the same time, change it at a later date. The idea of the long-term adaptions is to...

"...I'm in the predictable situation of a totalled TDV8 6 speed gearbox" Nothing predictable about that – the ZF 6HP26 transmission has an enviable reputation for reliability. Having said that, these are the known issues that occasionally affect this transmission : 1. Transmission won’t shift...

When mine went I just replaced the 20cm or so of the two melted wires and the connector, plus a new thermostat assembly. Phil Edit : assuming that you meant the thermostat heater rather than the coolant sensor

Yep, the 3.6 TDV8 was introduced for 2007 model year Phil

Hi Andy, If you’d like to PM me your email address I can get back to you with a quote (assuming yours is the ZF 5HP24 transmission?). I should point out though that I only work on transmissions, and not vehicles, so you would have to make your own arrangements for having the transmission...