To answer your question you should NOT need to reprogram your computer (PCM/ECU) when you replace your transmission as long as it's a stock replacement (or stock rebuild).
How do you reprogram a transmission control module?
Does a used transmission control module need to be programmed?
Yes they do. Almost all control modules will now need to be programmed for the vehicles specific VIN otherwise you will get a VIN mismatch error and possibly the vehicle will not start and run.
What is Reflashing a transmission?
Reflashing or reprogramming is the process of replacing the existing software in a vehicle controller with new software. This requires an electronic transfer of approved calibration files from a vehicle manufacturer's website.
How long does it take to program a transmission?
How Long Does it Take? If you take your vehicle to a repair shop that has the right tools and the information from the manufacturer, the process takes about 30 minutes to complete. Reprogramming a transmission shouldn't take very long.29 Jan 2021
How much does it cost to reprogram a transmission?
The cost to reprogram a transmission ranges between $75 and $250. Most of the time, you can get this done at your local dealership, but you can also trust a local repair shop, like My Transmission Experts, to get the job done.29 Jan 2021
What to do after installing a new transmission?
Flush often—back flush your transmission cooler to prevent contamination of your transmission and torque converter, and make sure to flush and inspect your existing converter if you plan on reusing it. 2. Inspect your flexplate and driveshaft before installing your transmission.16 Mar 2017
How long does it take to reprogram a transmission control module?