Share of active Class 5–8 listings by engine make, transmission type, cab type, and axle configuration — with the year-over-year shift against the prior 12-month cohort.
Top engine make
Cummins
37.5% share (— YoY)
Source: TruckRadar
Top transmission type
Automatic
59.6% share (— YoY)
Source: TruckRadar
Top cab type
Conventional
99.5% share (— YoY)
Source: TruckRadar
Top axle config
6x4
70.9% share (— YoY)
Source: TruckRadar
As of April 27, 2026, the TruckRadar heavy-duty listing mix is led by Cummins at 37.5% of active listings (— YoY). Transmission share is concentrated in Automatic units at 59.6%. Cab type is led by Conventional (99.5%), and axle configuration is led by 6x4 (70.9%). Fleet procurement teams read the YoY deltas as early signals for parts-network depth, driver training requirements, and residual-value exposure. Dealer inventory managers use the same mix to decide which specs to over- or under-weight in the next buying cycle. TruckRadar regenerates this snapshot every 24 hours from the listing table.
| Engine make | Share | YoY |
|---|---|---|
| Cummins | 37.5% | — |
| Detroit | 20.3% | — |
| Paccar | 12.4% | — |
| Volvo | 9.0% | — |
| Mack | 6.7% | — |
| Isuzu | 4.9% | — |
| Other | 9.2% | — |
Current 12-month cohort vs. the prior 12-month cohort (YoY pts).
| Transmission type | Share | YoY |
|---|---|---|
| Automatic | 59.6% | — |
| Automated | 25.1% | — |
| Manual | 15.4% | — |
Manual, automated-manual, and fully automatic splits.
| Cab type | Share | YoY |
|---|---|---|
| Conventional | 99.5% | — |
| Crew | 0.5% | — |
Conventional, cabover, and crew cab splits.
| Axle config | Share | YoY |
|---|---|---|
| 6x4 | 70.9% | — |
| 4x2 | 27.5% | — |
| 8x4 | 1.2% | — |
| 6x2 | 0.3% | — |
| 8x6 | 0.0% | — |
Standard drive-axle notations: 4x2, 6x4, 6x2, 8x4, 8x6.
Spec share is the percentage of active truck listings with a given attribute. For example, a Cummins engine make share of 42% means 42% of active trucks on TruckRadar carry a Cummins engine. Shares are computed across listings first seen in the trailing 12 months.
YoY delta compares the current 12-month cohort (listings first seen in the last 12 months) with the prior cohort (listings first seen 12–24 months ago). A delta of +2.1 percentage points means the current share is 2.1 pts higher than a year ago.
Engine make share is a leading indicator of parts-network depth and technician availability. A rising Cummins X15 share, for instance, signals that aftermarket parts will remain price-competitive and that driver familiarity with the powertrain remains high. Shrinking shares can foreshadow parts scarcity risk in later trade cycles.
The long-term trend in Class 8 is from manual and automated-manual toward fully automated transmissions (Detroit DT12, Eaton Endurant, Allison). A rising automated share typically tracks driver-shortage pressure — fleets spec for a larger pool of CDL holders who did not train on manuals.
Snapshots regenerate every 24 hours from the TruckRadar listing table. Underlying listings update continuously via dealer feeds and scrapers; the cached rollup keeps query cost predictable and the page fast.
The public page reports an all-class aggregate. Class, body type, and region slices are available to signed-in dealers in the dashboard. Private buyers can approximate a slice by filtering search results and reviewing the facet counts on the listings page.