Do I have to change my trans if I want to swap to a lightning motor.
#2
What engine is in your STX?
Lightning came with 4R100 and 9.75" rear.
STX 4.2 came with 4R70W which will NOT work on a V8 and a 8.8" rear.
STX 4.6 came with a compatible 4R70W and 8.8" rear.
STX 5.4 came with a compatible 4R70W and 9.75" rear.
A 4R70 PCM cannot run a 4R100, and vice versa.
Lightning came with 4R100 and 9.75" rear.
STX 4.2 came with 4R70W which will NOT work on a V8 and a 8.8" rear.
STX 4.6 came with a compatible 4R70W and 8.8" rear.
STX 5.4 came with a compatible 4R70W and 9.75" rear.
A 4R70 PCM cannot run a 4R100, and vice versa.