10 Speed Transmission Downshifting Errors

Fixing Downshifting Mistakes in a Semi-Truck
Downshifting a semi-truck transmission (8 speed, 9 speed or 10 speed) can be difficult when you are learning. Here are some common reasons why downshifting may cause you trouble and the ways to fix it

Pushing the clutch in too far

How to fix it:

Think. Tap to neutral--> Rev engine-->Tap to gear

  • Tap the clutch-----Shift to neutral
  • Hit accelerator to 1500 rpms and let come down to 1000 rpms
  • Tap the clutch and shift to the lower gear

Imagine a balloon under the clutch. It will bend when the clutch is pushed in a little, and break when pushed in too far.

Not revving the engine the correct amount in neutral

How to fix it:

Practice the correct amount when parked:
a. Watch the tachometer and rev the engine to 1400 rpms several times
b. Listen to what it sounds like
c. Close your eyes and try matching the sound

Downshifting too fast or too slow

How to fix it:

1. Find the rhythm of Tap, Vroom, Tap
2. Practice air downshifting. Sit with the truck parked and the engine running.

Hold your hand above the gearshift and pretend to downshift while actually using the clutch and the accelerator.

Not slowing down to downshift

How to fix it:

USE THE BRAKE. Waiting for the truck to slow down on its own takes too long. Use the brake Slow down to around 1000 rpms, then downshift. Slowing down is part of the slowing down process.

Our shifting video will explain the concepts of downshifting and upshifting a semi-truck

Learn to shift a 9, 10, 13, 15 or 18-Speed Transmission