As you know, the car engine converts the energy of fuel combustion, turning reciprocating motion of pistons in the cylinders of the engine into rotary motion on the crankshaft (torque). Thus, the speed of rotation of a crankshaft and wheels of the car strongly differ.
There are several types of these systems. In this case, as of today, the most actively used on cars is a mechanical one, which converts the mechanical energy derived from the motor. Also widespread is a hydro-mechanical system, where the torque is changed automatically.
Simply put, the most common today are manual transmission with manual and automatic systems (hydromechanical transmission). Each of these types is different in its design, has both advantages and disadvantages, but their main task is always to obtain, convert and transfer torque from the motor to the drive wheels of the machine.
FS5W71C gear set
First of all, you should do the rebuild yourself, only if you are good at transmissions, and have good tools, a press, bearing pullers, and all sorts of generic tools. Also, a set of helping hands would be useful.
FS5W71C is a complete kit, but some doubt its quality since it is aftermarket. It is designed for a Nissan with four cylinders. It is a 5th gear set that includes 21 tooth and 39 tooth. You can install this aftermarket kit on 1986-1993 vehicles. This kit is made by Cobra Transmission. It will cost you somewhere from $100-$150.
FS5W71C 4×4 transmission
Until quite recently, a huge share of buyers around the world preferred cars equipped with only one axle drive and categorized “4×4” as exclusively off-road. Now such sight is outdated: systems of a full drive for today have seriously evolved and carried out some other, not less important functions. Thus, the All Mode 4×4-i system has become “all-corporate” for most of Nissan’s models. All-wheel drive is needed not only for off-road driving: it also helps on asphalt, increasing comfort and safety.
As in the previous system generation, the 2WD, Auto and Lock modes (front-drive, automatic mode, locked coupling) have been retained. In general, the torque distribution logic has remained the same. In automatic mode, the rear wheels are mainly engaged when the front wheels are slipped, and up to 50% of the torque can be transmitted back.
The closing of the clutch itself depends on the operation of many sensors – steering, angular speed, acceleration and wheel speed. Although the clutch in the rear axle drive can be locked rigidly by activating the Lock mode. But here it is worth remembering that movement with the locked “centre” (in fact, inter-axis differential) is possible only on slippery surfaces – rear and front axle wheels rotate at the same speed, which can adversely affect the elements of the transmission.
That’s why the clutch automatically switches to the Auto mode when the car accelerates abruptly. As before, the all-wheel-drive system actively cooperates with the vehicle’s Dynamic Stability Program (ESP): in addition to helping with the loss of control (drifting or skidding), the system can also help off-road. This is most characteristic of diagonal hanging, where ESP brakes the towing wheels, transmitting torque to stationary wheels. However, this electronic helper is not always needed: to overcome slippery terrain, when maximum engine output is required, it is recommended to switch off the system.
FS5w71C specs include the active interaction of the transmission with the integrated chassis control system Nissan Chassis Control. In addition to the fact that, depending on road conditions, the system can automatically shift the torque between the axles, electronics can help to keep the engine on the braking trajectory during a cornering or straight cut. Also, to keep the trajectory set during cornering, the system separately adjusts the braking forces applied to each wheel to compensate for understeer or oversteer. At the end of the picture is the body’s damping system: if the electronics notice the development of diagonal swinging, feed swings can be eliminated by a short brake pulse.
Nissan d21 transmission rebuild kit
When it comes to your Nissan D21, you want parts and products from only trusted brands. The basic rebuild kit for your Nissan will cost you somewhere around $200-300. It includes a gasket and friction set. It should include only the highest quality parts that meet or exceed OE specifications.
RS5F32v rebuild kit
The RS5F32V is installed on ’91-’94 Sentra SE-R (Viscous Coupling Limited slip differential). The basic may cost you somewhere from $300-$500. It consists of a full friction and gasket set. It should include only the highest quality parts that meet or exceed OE specifications.
FS6R31A rebuild kit
Manual gearbox MKPP FS6R31A (6 stages. 2WD) was installed on Nissan Skyline ’01-’06 (CPV35). The FS6R31A series works roughly but is quite reliable. It’s a gear made for commercial vehicles with a huge resource. Among its disadvantages are a weak two-mass flywheel and a weak grip.
The price of a rebuild kit varies from $200 to $300.
KA24DE transmission rebuild kit
To change the dynamics of the car, it is worth thinking about improving the technical performance of the transmission. Tuning of this mechanism is one of the most necessary actions when increasing productivity. If it is necessary to change the gears and pinions in the gearbox, it is necessary to remember that not every number of gear ratios will work with the main gear of your car.
However, a cam gearbox can be fitted to the car at an extra cost to make the owner feel like a real car driver. In addition to the above, do not forget about the clutch, another important transmission mechanism. It is intended for communication of a gearbox with the car engine. It is enough to reduce the weight of a flywheel and also to establish the ceramic clutch which will exclude scrolling of wheels of the car on a place.
The ka24de was used in both fwd and rwd configurations. As for the rebuild kit, you get the bearings from drivetrain.com and the synchro’s from Nissan.