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Did you flush the cooler and lines? Did you replace the torq converter?
the used unit did not come with converter? usually debris in the system is the cause... I would replace the unit and the converter...contamination in the converter likely destroyed the new unit
The finer particles get past the filter and stuck in the fiber washers in the converter and trash it,
If a torque converter fails a stall test or is leaking, it must be replaced. Most experts recommend replacing the torque converter if an automatic transmission or transaxle has failed and is being replaced. Why? Because the torque converter acts like a garbage pit and traps a lot of the debris that results from normal wear. The debris may then contaminate and damage the new transmission. Why not just rinse out the old torque converter with solvent? The design of the wheels and large surface area inside the converter make it very difficult to clean.
By the time most transmissions need to be replaced, the friction linings inside a lockup converter are reaching the end of their service life. Reusing a lockup torque converter with worn linings is asking for trouble. And since there's no easy way to open up and clean or rebuild the internal components (doing so requires cutting open the housing on a lathe and rewelding the housing to seal it back up), replacement is your only option. A locked one-way clutch will also cause the fluid to run dangerously hot, which can damage the transmission and lead to transmission failure. If the one-way clutch fails to hold its position and freewheels in both directions, the torque converter can't multiply torque normally and the vehicle will accelerate slowly (like starting out in second gear). The only cure for either condition is to replace the torque converter.
no problem it likely did damage
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