Allison transmissions
Allison’s commercial-vehicle range includes fully automatic transmission families for different vehicle duties. A family number such as 3000 or 4000 does not identify every rating, control generation or vocation package. Start with the exact model and serial number. Compare the complete truck, including cooling, engine approval and auxiliary equipment, before treating one transmission family as a direct substitute for another.
Compare the model families
| Model / family | Application | Overview | Model notes |
|---|---|---|---|
| 1000 and 2000 Series | Light and medium-duty automatic families | Allison groups its 1000 and 2000 Series for light- and medium-duty commercial vehicles. Its product directory lists family capability up to 365 hp and 700 lb-ft. Those upper figures do not mean every model or installed transmission has the same rating. | Read the profile → |
| 3000 Series | Medium-duty automatic family | Allison describes the 3000 Series as a commercial-vehicle transmission family developed for medium-duty applications. It is a separate family from the lighter 1000/2000 and heavier 4000 offerings. The full model and application suffix determine what a particular unit supports. | Read the profile → |
| 4000 Series | Heavy-duty automatic family | Allison positions the 4000 Series for heavy-duty vehicles. Its product catalogue lists a wider upper capability than the 3000 Series, but an individual 4000-series model still has application-specific limits. The family label is not a blanket approval for any engine or gross weight. | Read the profile → |
Bring the exact specification.
The family name helps organize your search. The build sheet, serial number and relevant manufacturer documentation identify what is installed. Compare like-for-like applications and request evidence for cost or performance claims.
Manufacturer references support the model facts. Our examples and comparisons are editorial interpretation prepared with AI assistance, not road tests or an expert inspection.
Check the year, market and exact build before applying a specification. This guide does not authorize parts fitment, repairs, modifications or loading.
Allison manufacturer reference ↗Independent editorial resource. Brand names identify equipment; they do not imply a partnership or endorsement.