Dead stock 1975 Dart 4 door, 225 Auto, Manual brakes. Had a LS 1800 or less stall. At a stop light in Drive, the RPM was stumbly and it would push the car hard through the brakes even 2 footen it.
Redid the brake drums and shoes, replaced the master cylinder, replaced rubber brake lines. Did not matter.

Finally I pulled the 904 and replaced the converter with a \6 weighted High Stall and put a TransGo shift kit in it . Fixed it. Idle was smoother and I could hold the car with my toes on the peddle.