BD DIESEL 1604721 SHIFT KIT SILVERADO/SIERRA 6.6L DURAMAX ALLISON 1000 2006-2008 6 SPEED

Product Description

The BD DIESEL 1604721 Shift Kit is built for drivers who want stronger, cleaner shifting and improved clutch durability from the 6-speed Allison 1000 behind the 6.6L Duramax. This kit targets common valve body and clutch-control issues that show up under towing, heavy throttle, and higher power levels—helping reduce unwanted shift flare, “neutraling” under load, and premature clutch wear.

BD Diesel 1604721, Allison 1000 6-speed shift kit, Duramax transmission shift kit, Silverado Sierra 2006 2007 2008 Allison 1000, smart trim clutch control valves, crisp smooth upshifts, reduces 3-4 slip, prevents neutral under load, C2 clutch durability upgrade

This shift kit includes BD’s Smart Trim / Clutch Control valve assemblies and components designed to improve pressure control and clutch apply characteristics. The result is short, crisp, smooth upshifts and kickdowns, better consistency under load, and a durability-focused update aimed at the C2/C3 clutch concerns seen in these applications.

Fitment

• 2006 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax – Allison 1000 6-Speed
• 2007 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax – Allison 1000 6-Speed
• 2008 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax – Allison 1000 6-Speed
• 2006 GMC Sierra 2500HD / 3500HD 6.6L Duramax – Allison 1000 6-Speed
• 2007 GMC Sierra 2500HD / 3500HD 6.6L Duramax – Allison 1000 6-Speed
• 2008 GMC Sierra 2500HD / 3500HD 6.6L Duramax – Allison 1000 6-Speed

Install Note: Experienced technician installation is recommended (valve body work and calibration-sensitive components).

Cross-Reference / Compatible BD DIESEL Products

• BD DIESEL 1030472 ALLISON EXCHANGE VALVE BODY – 2006–2010 GM DURAMAX LBZ/LMM 6-SPEED
• BD DIESEL 1064041 TRANSMISSION FILTER SERVICE KIT – 2001–2016 DURAMAX ALLISON 1000
• BD DIESEL 1071240 PROFORCE 3D TORQUE CONVERTER – 2001–2016 DURAMAX ALLISON 1000

FAQ

What does the BD shift kit improve?

It improves pressure control and clutch apply behavior for firmer, more consistent shifting—especially under load—while addressing common issues like 3-4 slip and neutraling.

Is this recommended for towing?

Yes. More consistent clutch apply and improved shift control are beneficial under sustained load and heat, which is common during towing.

Do I need a professional to install this?

Yes. This kit involves valve body work and is best installed by an experienced technician to ensure correct function and cleanliness during assembly.

Specifications for BD DIESEL PRODUCTS 1604721