BD DIESEL 1604720 SHIFT KIT FOR CHEVY/GMC ALLISON 1000 (5-SPEED) 2001–2005

Product Description

The BD DIESEL 1604720 Shift Kit is a performance and durability upgrade for the Allison 1000 5-speed found behind 2001–2005 Chevy/GMC Duramax applications. This kit is designed to correct common Allison valve body issues while improving pressure control and shift feel—delivering the kind of short, crisp, smooth upshifts and kickdowns that reduce heat, slip, and clutch wear under towing and load.

BD Diesel 1604720 shift kit, Allison 1000 5 speed shift kit 2001-2005, Duramax valve body shift kit, increase line pressure Allison 1000, fix 3-4 slip, prevent neutral under load, clutch control valve assemblies, towing shift kit, transmission durability upgrade

This kit targets real-world failures like 3/4 slip, going to neutral under load, burned clutch packs, and sluggish/erratic shift behavior. BD’s updated valve assemblies help restore consistent apply pressure and improve hydraulic control so the transmission can hold power more reliably—especially on tuned trucks, work trucks, and heavy tow rigs.

Fitment

• 2001–2005 Chevy Silverado 2500HD/3500HD – 6.6L Duramax with Allison 1000 (5-speed)
• 2001–2005 GMC Sierra 2500HD/3500HD – 6.6L Duramax with Allison 1000 (5-speed)

Install Note: This kit includes internal components and requires transmission removal for installation of internal parts. Professional/experienced installation is strongly recommended.

Cross-Reference / Compatible BD DIESEL Products

• BD DIESEL 1604721 SHIFT KIT – ALLISON 1000 6-SPEED (2006–2008)
• BD DIESEL 1061650 DEEP SUMP ALLISON 1000 TRANSMISSION PAN (2001–2018)

FAQ

What problems does the BD 1604720 shift kit help correct?

It’s built to address common Allison 1000 issues like 3-4 slip, neutral-out under load, inconsistent pressure control, and clutch wear that results from heat and hydraulic leakage.

Will this make my shifts harsh?

The goal is not harsh shifting—it's controlled, firmer, cleaner shifts with improved apply pressure and better clutch protection, especially under throttle and towing.

Is professional installation required?

It’s strongly recommended. This kit requires removal of the transmission to install internal components and is best handled by an experienced technician.

Specifications for BD DIESEL PRODUCTS 1604720