Allison 3500 Series (heavy vocational)
Automatic • 6-speed • Allison Transmission
About the Allison 3500 Series (heavy vocational)
The Allison 3500 series is a heavier-duty variant of the 3000 — higher torque capacity, more robust internals, optimized for severe-duty vocational use (refuse, heavy dump, concrete mixer, severe-duty service body). 1,450 lb-ft torque capacity supports heavier engine options. Common in refuse fleets where stop-and-go duty cycles are extreme. Built on the 3000 platform with reinforced clutches and updated valve body.
Overview
The Allison 3500 series is a heavier-duty variant of the 3000 — higher torque capacity, more robust internals, optimized for severe-duty vocational use (refuse, heavy dump, concrete mixer, severe-duty service body). 1,450 lb-ft torque capacity supports heavier engine options. Common in refuse fleets where stop-and-go duty cycles are extreme. Built on the 3000 platform with reinforced clutches and updated valve body.
Specifications
- Manufacturer
- Allison Transmission
- Type
- Automatic
- Gear count
- 6
- Torque capacity
- 1450 lb-ft
- Truck classes
- Class 7-8
- Applications
- Refuse, severe-duty vocational, dump, concrete mixer (heavy duty)
- Production years
- 2005–present
Design and engineering
6-speed automatic with torque converter, reinforced internals vs 3000 series. Heavy-duty clutch packs. Multiple PTO options for refuse compactor and dump body. Allison TES-295 fluid required.
Generations and updates
Reliability and longevity
Allison-grade reliability in severe-duty. Refuse applications stress the transmission heavily (constant load cycling); Allison 3500 handles it.
Common problems
Refuse duty cycle stresses solenoids and clutches faster than highway use. Fluid contamination from severe-duty operation — magnet inspection is critical.
Driver experience
Smooth shifting under heavy load. Designed for stop-and-go vocational, not optimized for highway use.
Pros and cons
✓ Pros
- • Heavy-duty version of proven 3000
- • Optimized for severe-duty
- • Strong refuse / dump market presence
⚠ Cons
- • Higher cost than 3000
- • Severe-duty service intervals tighter