Tech A says that when governor pressure on one side of a shift valve overcomes spring pressure and throttle pressure on the other side, an upshift occurs. Tech B says when reverse boost pressure on one side of the reverse valve overcomes governor pressure on the other side, a shift into reverse occurs. Who is correct?
A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Tech A is correct because an upshift in an automatic transmission occurs when the governor pressure overcomes the combined spring and throttle pressure on the shift valve. Tech B's statement is incorrect because reverse boost pressure does not interact with governor pressure for a shift into reverse.

Tech a Says That When Governor Pressure on One Side