Transmission Does Not Shift

Transmission does not shift

Input shaft (mainshaft) speed sensor defective

Output shaft (countershaft) speed sensor defective

Engine output low

Notes

Check the speed sensor installation.

Notes

Inspect the input shaft (mainshaft) speed sensor or the output shaft (countershaft) speed sensor O-ring for wear and damage.

Notes

Check for exhaust restrictions.

Notes

Check for intake restrictions.

Notes

Check fuel pressure Testing and Inspection.