I hate to say this but transmission repair shops employ some of the most dishonest practices in the automotive industry. They are able to get away with this for two reasons.
The first reason is for every 50 general automotive mechanic shops there are may be five transmission shops. So supply and demand naturally hires the prices these companies can charge. This is nothing new but some of these transmission companies get outrageous.
Second, unless you are a a specialist in this field you most likely know nothing about transmissions. Any technician can tell you anything and you have no verifiable way of double checking.
Here are some common scams in the transmission repair industry and some common mistakes that customers make:
We need a new transmission a shop will give usually give you two options. They can either install a brand-new transmission, which will cost a lot, or they can install a rebuilt transmission, which will still cost a lot but possibly be half the cost.