Chevy GMC - Allison Transmission

Allison 1000 Series automatic transmission, manufactured in October 2001

Came out a running and driving Chevy 2500 Diesel with 100.000 miles

Serial No.: 6320013313 built at the *Baltimore plant*.

Application & Context

Primary Use: Light-to-medium duty on-highway vehicles, paired with GM Duramax 6.6L diesel engines* (LB7 generation, 2001–2004 model years) in trucks like:

• Chevrolet Silverado 2500HD/3500HD
• GMC Sierra 2500HD/3500HD`

It is a 5-speed transmission). It includes a park pawl.

Rated for roughly up to ~300–400 hp and ~500–680+ lb-ft torque in stock form, depending on exact configuration and vehicle GVWR (typically up to ~19,850 lbs for 1000 Series).

It’s known for solid durability in stock form but has common upgrade paths for higher power (e.g., in diesel performance builds).

Ask about this part to check availability and arrange a purchase.