70 Series Auto Conversion: All You Need To Know

70 Series Auto Conversion: All You Need To Know

The 70 series 4.5Li V8 in ZF automatic drive superbly. There is no delay getting power to the wheels, the transmission is in the appropriate gear at all times, the RPM is substantially less, its so much quieter.

The power, and more particularly the torque vary enormously from vehicle to vehicle, depending on any remapping of the ECU or chips that have been fitted, exhaust changes, turbocharger upgrades and matching injector volume increases.

Standard power and torque can be as low as 110kw/325nm respectively, but its not impossible to achieve 250kw and 1000nm of torque. And more.

Obviously this will dramatically effect the life of the automatic transmission.

We have two ZF 8 Speed variants to suit this wide variety of applications.

Our Heavy Duty version is rated to 770nm.

Our SUPER DUTY version is rated to 1000nm

The SUPER DUTY is a new transmission, disassembled and the following components replaced:

  • Billet Clutch Hub
  • Upgraded Clutches and Steels Throughout Entire Transmission
  • All New Gaskets, Seals and Rings
  • Upgrades O-Rings and Seals Within the Valve-Body Assembly
  • Cog Drives and Shaft Modified for Better Lubrication Transfer
  • Heat Treated & Hard Anodized Clutch Baskets
  • Brand New Pan, Filter Element

 The reason these components in particular are changed is:

  • Modified basket assemblies for better oiling and three step process for added strength and durability
  • New clutch packs consisting of our proprietary paper friction and steels throughout the entire transmission. A and B brake along with C/D and E clutch assemblies are all addressed to give stock like drivability but the holding power needed for this power level
  • The torque converter in the SUPER DUTY will yield a 3000rpm stall on the foot brake all while keeping a nice tight feel for around town driving
  • All gaskets, seals and rings are changed

Both transmission variants have common design features, which are impressive in comparison to other automatics.

The ZF is a more advanced, next generation automatic transmission than the say, the AB60. The ZF has a sophisticated management program, including down hill decent control, and adaptive shift. It does not require a separate switch to lock the torque converter like the previous generation ie the AB60.

The ZF manages the engine efficiency by keeping it at max torque as much as possible, the torque converter locks and unlocks constantly during normal operation – when it senses there is efficiency to be gained, when it senses the input shaft and the output shafts – in relation to the wheel speeds, need to be controlled, rather than allowing the torque converter to slip.

The ZF transmission efficiency and wide ratio spread provides the best possible fuel economy. With eight speeds, driving at a lower rpm in both city and highway environments also effectively helps reduce emissions.

The transmission efficiency and gear ratio spread enable spending more time at lower engine rpm.

Fully electronic and aided with software that provides an adaptive shifting strategy, the ZF has been designed to provide optimal shifting characteristics.

Adaptive shifting takes into account a number of variables including engine torque gradients, kick down, longitudinal and lateral acceleration, hill decent detection, friction detection and downshift detection in determining shift patterns. Additional parameters include vehicle speed control, electronic stability control activation and high temperatures that can affect transmission shifting.

The addition of more gear ratios in the transmission helps reduce the gaps normally associated with upshifting and downshifting. Vehicles benefit from nearly imperceptible gear changes due in part to very evenly spaced gear steps between each gear ratio. The gear steps also are very small providing quicker acceleration and smoother shifts.

All shifts, whether single, double or multiple are performed as a direct result of the accelerator pedal position. Downshifts are made with very short response times and lead directly to the requested gear. Multiple upshifts can be decoupled temporarily if the torque request changes during the upshift. This helps eliminate the shift searching in the transmission.

During more spirited driving conditions, sporty, quick shifts are possible as a result of multiple parameters either through a Sport shift mode that requires simple driver input. At the rear of the shifter is a gate that allows for down- and up-shifting by the driver.

Once the Sport mode is selected, shift times are quicker and engine rpm is allowed to increase for more performance oriented acceleration and higher shift dynamics.

Internally, the ZF transmission features four gear sets and five shift elements (multi-disc clutches and brakes) inside the transmission. With fewer open shift elements, drag losses due to multiple parts rotating relative to one another, are reduced.

Additionally, lower viscosity transmission fluid is used resulting in improved transmission efficiency and fuel economy improvements especially during cold environments or vehicle start-up.

The down hill decent mode really works. The first gear is lower than the manual, combining with the torque converter lockup, it crawls. We have had reports that the auto is slower down hills than the equivalent manual. A manual troopie was following an auto troopie, and the manual vehicle kept having to brake as it was catching up to the auto!

All parts in the kit are new, and it comes with a 12/20,000km Warranty.

If you are interested in becoming a fitting station, please contact our team at LTG4x4.

If you are interested in finding out more about our auto conversion, please get in touch with our friendly LTG4x4 team today.

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