How does a factory re-manufactured transmission compare with a transmission rebuilt in a shop?
The answer really depends on the two businesses involved. A very good factory re-manufactured transmission is better than a mediocre shop rebuild. On the other hand, a quality shop can custom build the transmission, many times making it far better than the original. As a general rule, factory re-manufacturing is geared towards production and providing a product comparable to the original. Sometimes this is adequate. With transmissions that have known problems with durability, a quality shop rebuild can provide a unit that is superior to the original. For much more on proper transmission rebuilding, see our article Transmissions: Repair, Rebuild or Replace.