CDL · 5% of test plan

Shifting & Transmission for the CDL Exam

Shifting is on the road test rather than the written test. Examiners listen for grinding, watch for excessive engine RPM, and time downshifts on grades. Modern automatics are accepted but result in an automatic-only restriction (E) on the CDL.

Locale-specific study guides

Pass-rate data, regulatory context, and study tips for Shifting & Transmission all change by candidate locale. Pick your context:

Common failure modes

These are the patterns that cause most candidates to lose marks on this topic. Recognising them in advance is half the work.

!Skipping double-clutch on upshifts and downshifts
!Floating gears — most state tests count this as a fail
!Coasting in neutral on downgrades (illegal in most states)
!Wrong range/splitter sequence on 13- and 18-speed transmissions

Study tips

1Drill the double-clutch sequence: clutch in, neutral, clutch out, RPM match, clutch in, gear, clutch out.
2Practice progressive shifting to save fuel and reduce emissions noise.
3Memorize the rule against coasting in neutral.
4Know when to pre-select a gear before a hill — once on the grade, downshifting becomes hard.

Sample CDL Shifting & Transmission questions

These sample items mirror the format and difficulty of real CDL questions. Practice with thousands more on the free Koydo question bank.

1
Coasting in neutral down a grade is:
- ARecommended for fuel economy
- BIllegal under CDL rules in most statesCorrect
- CAllowed if engine is at idle
- DPermitted only with engine brake engaged
Why this answer?
Coasting in neutral on any downgrade is illegal in most states. CDL drivers must remain in gear so engine braking and immediate acceleration are available.

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