When a transmission requires an overhaul, there are generally two options that you may have. The first is to remove your existing transmission and overhaul it, and then put the same, newly rebuilt unit back in your vehicle. The second option is to replace your existing unit with another unit that has already been rebuilt or remanufactured.
The second option will get you out of the shop and on your way much faster but may cause you problems down the road. The reason for this is that, in some but not all cases, a particular transmission model can have dozens of variations depending on which model car, which engine, which axle ratio, even which tire size. The problems you could experience could be as simple as a speedometer that reads too high or too low (the speedometer is usually connected by a cable to a gear in the transmission output shaft). You may also experience incorrect shift points or even complete transmission failure because your engine may be more powerful than the one the replacement unit was originally designed for. This is not the case with all transmission models so voice your concerns with your technician. Most shops will rebuild your existing unit if you request it as long as they can afford to have a lift tied up with your vehicle while the transmission is being rebuilt. Of course this is only important if you are sure that the transmission you have is the original one and has never previously been replaced.
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