Assuming you are asking if it is cheaper to rebuild or replace a transmission in a car, the answer may vary. It depends on the severity of damage, the make and model of the car, and whether replacement parts are readily available.
In general, rebuilding a transmission is cheaper than replacing it because you are only repairing what is broken rather than buying an entirely new unit. However, if the damage is extensive, it may be more cost effective to replace the transmission.
The make and model of the car also play a role in deciding whether to rebuild or replace the transmission. For example, transmissions in older cars are often easier to rebuild because replacement parts are more readily available. With newer cars, however, it may be difficult to find replacement parts and thus more expensive to rebuild the transmission.
Ultimately, whether it is cheaper to rebuild or replace a transmission depends on several factors and should be decided on a case-by-case basis.