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The need for a transmission in an automobile is a consequence of the characteristics of the internal combustion engine. Engines typically operate over a range of 600 to about 6000 revolutions per minute (though this varies from design to design and is typically less for diesel engines), while the car's wheels rotate between 0 rpm and around 2500 rpm.
Furthermore, the engine provides its highest torque outputs approximately in the middle of its range, while often the greatest torque is required when the vehicle is moving from rest or traveling slowly. Therefore, a system that transforms the engine's output so that it can supply high torque at low speeds, but also operate at highway speeds with the motor still operating within its limits, is required. Transmissions perform this transformation.
Most transmissions and gears used in automotive and truck applications are contained in a cast iron case, though sometimes aluminum is used for lower weight. There are three shafts: a main shaft, a countershaft, and an idler shaft.
The main shaft extends outside the case in both directions: the input shaft towards the engine, and the output shaft towards the rear axle (on rear wheel drive cars). The shaft is suspended by the main bearings, and is split towards the input end. At the point of the split, a pilot bearing holds the shafts together. The gears and clutches ride on the main shaft, the gears being free to turn relative to the main shaft except when engaged by the clutches.

Honda Transmission
Honda Transmission Jasper transmission.
The Class I performance transmission is equipped with a stock remanufactured torque converter and a shift kit for a firmer, more pronounced shift. The Class II performance transmission is for the serious performance minded individual who wants a transmission that will meet their particular application. These transmissions are built with heavy-duty performance in mind. Special components and procedures are matched to obtain maximum performance for your engine application. Applications include performance oriented cars and trucks, street rods and restored muscle cars, vans and towing vehicles and OEM replacement. Class III racing transmissions are custom built for your application. Suitable for Honda and Acura.
Nissan Transmission
Nissan Transmission Valve bodies are calibrated to provide firm, positive shifts, extra forward, reverse and high clutches are installed, modified OEM solenoid assembly is installed, lube system is redesigned to prevent geartrain failure and to increase lube flow, large apply area factory servo is installed to provide maximum band holding capacity (where applicable), new one-way clutches/sprags are installed, high volume pump slide spring is installed (where applicable), planetary splines are heat treated to prevent stripping, planetary pinion pins are welded to eliminate pin "walk-out"
Mitsubishi Transmission
Mitsubishi Transmission Valve bodies are custom calibrated to provide firm positive shifts, large apply area O.E.M. servo is installed to provide maximum band clamping force, aftermarket designed sealing rings are installed to minimize hydraulic leakage, additional clutches are installed, utilizes IPT's exclusive five disk front clutch pack which provides 25% more torque capacity in 3rd gear (W4A33 and F4A33 only), new one-way clutches/sprags are installed, revised end clutch is installed to increase the holding capacity of the problematic overdrive clutches Now Featuring Raybestos X-32 friction material, cooler / converter oil circuit is redesigned to improve lube flow, redesigned band apply pin is installed to provide firmer 1-2 and 3-4 shifts, sun shell is heat treated to prevent spline stripping, AWD output shaft is heat treated to prevent spline stripping (where applicable).
Tremec Transmission
Tremec Transmission TREMEC transmissions are used in various applications by major vehicle manufacturers around the world, and have been since 1964. Many of the world's best-known high-performance vehicles depend on TREMEC for high-quality, high-performance transmissions. Each product must undergo a myriad of analytical laboratory tests to guarantee quality and durability. We use simultaneous engineering and advanced satellite communications with customers to streamline the process of developing optimum transmission solutions tailored to specific vehicle requirements. TREMEC transmissions have been put to the test in real-world settings, such as the Bob Bondurant School of High Performance Driving, where they have earned their reputation for uncompromised performance.
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