VL Turbo Commodore Nissan Datsun Jatco Automatic Shift Kit Servic
Do not message me asking for a "full manual valve body".
Shift kits are developed to reduce the sloppy, soft gear changes during acceleration in older cars with hydraulically controlled auto transmissions. This improves acceleration and reduces wear or damage caused to the transmission, espcially when the engine is producing more horsepower than standard. This kit allows safe operation of the standard auto with up to 14 psi boost pressure on turbo engines.
THIS SHIFT KIT CONSISTS OF:
1 x DVD containing an electronic document with all the developed information including detailed pictures required for you to remove the valve body from your transmission and perform this shift kit modification yourself, as well as templates to show you which existing holes in your valve body require enlarging.
1 x Spring, to replace the existing pressure modifier spring inside your transmission’s valve body which will increase fluid pressure.
All you need, is to have a small amount of mechanical know-how to perform this modification yourself. If you do not feel confident, you can always take the contents of this shift kit to an Auto Transmission service center and they can install it for you.
An automatic transmission's main focus is smooth shifting between gears. To accomplish this it often goes into two gears at once while shifting up, which is known as a shift overlap. By installing a shift kit you are increasing the speed at which these gears are changed. It will also reduce wear because the transmission won't be taking as long to slip from one gear to the next, similar to riding or slipping the clutch in a manual gearbox. Increasing engine horsepower in automatic cars can also speed up the damage and wear caused inside the auto transmission because the automatic is trying to smooth out gear changes as it was designed, with only the factory levels of horsepower. This is especially the case with turbo engines where it is very easy to achieve up to 50% more horsepower with little modifications to the engine.
HOW IT WORKS:
An automatic transmission has bands and clutches that are actuated by hydraulic servos controlled by the valve body to change gears. It is this hydraulic control center or valve body that receives pressurised fluid from a main pump operated by the fluid coupling/torque converter. The pressure coming from the pump is increased by replacing a spring in the valve body so the regulated pressure is higher and as a result, pushes a network of spring-loaded valves, check balls and servo pistons much faster. The fluid ‘pressure’ is not only increased to speed up the gear change, but the fluid ‘volume’ as well. The valve body contains a separator plate consisting of many holes which let fluid pass from one side of the valve body to the other. Enlarging particular holes allow a larger volume of the higher pressure fluid through.
Turbo cars also make use of the existing vacuum line which runs to the auto transmission from the engine inlet manifold. This vacuum line initially uses the engine vacuum to control shift points. During acceleration when the engine is producing boost, the shift kit allows the positive pressure from the turbo in the intake manifold (boost) to increase the firmness of the gear changes as well.
Installing a shift kit will not correct or eliminate symptoms of a previously faulty transmission.
- Date Listed:17/12/2017
- Last Edited:17/12/2017
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