A904 reverse problem

No stalling forward ? I had a 904 manual shift that would stall in any gear. The stator locked up in the converter.
Maybe ? The other thing may be band adjustment as I had one that locked up when it shifted to second. Low & reverse band too tight.
The converter company was Continental it was a 3500 I sent it back and they replaced it.The company is no longer in business. My 2 cents.