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Just In case your transmission is damaged so severely, that talk about repairing it is way beyond, then you will need a transmission replacement. To replace a transmission you have multiple options.
Dealer option -  is usually the most expensive option out there. They sell dealer re manufactured transmission. Most people think that if they buy it from the dealer, that they are getting a brand new transmission. The answer is no. It is a older transmission that has been rebuild with OEM parts at one of the car parts re manufacturing shops. When you buy a remanufactured transmission, on top of the price there is a core charge that means you have to return you broken transmission back otherwise you will be charged on average $500 extra. Now you can guess why they need your old transmission? - to rebuild it and sell it again.
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​ There are companies like Jasper and Certified, that sell already rebuilt and ready to go transmissions, that come with warranty, also your local San Diego Transmission Repair shop may have some replacement transmissions in stock ready to go. 

The cheapest option is to replace transmission with another used transmission form a crashed car. You can find used transmission for sale at a local wrecking yard. The only problem with used transmissions is short warranty they come with. Usually 30 to 90 days parts only.

​​Read more about used transmissions for sale.
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Gears date to the beginning of civilization, and the development and advances in gear technology have created the modern world. We as experts in transmissions, transfer cases and differentials work with gears every day.It is interesting to examine the theory and design, and some of the geometry involved in gear design.

Gears are wheels of various sizes that have teeth with which to engage an opposing gear to transmit motion. From there we achieve different gear ratios and torque ratings to make the rotating torque of an engine usable. Gears are manufactured from many materials, but for automotive use - steel alloys.
In mass manufacturing the alloys selected depend on the design, operating speeds, torque load and cost of manufacture. The better and stronger the alloy, the higher the cost to buy and, sometimes, the machining costs. The manufacturer will select the least-expensive product capable of producing the desired results. Because of this concept there are many after market parts that are made better, from better materials and last longer to improve performance.

Higher torque loads and operating speeds, such as with racing or high-performance vehicles, necessitate the use of higher-performing alloys, as the pricing is acceptable for the user.
After machining, the gears are heat-treated to strengthen the alloy to its correct hardness for the intended use. Alloys typically will grow or shrink during the heat- treat process, and a high level of expertise is needed to create product of uniform specifications.

Some companies try to eliminate that by heat-treating a semi-finished gear and then machining the hardened alloy to the final specs. These types of
gears are called hard-finished gears, and their cost is usually higher because of the perishable tooling required to cut hardened gears.

We use external gears — meaning the teeth are on the outside of the gear — which is the common form of transmission gear. There are beveled gears and closely related worm gears, which are used primarily to transfer power 90° from the input rotation.
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