Fits: 2001-2005 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY Duramax Diesel with 5 Speed Transmission

This item has to be programmed to your VIN, please allow 3-5 business days before shipment.

Improve your LB7 or LLY's reliability by utilizing our in-house designed and tested kit coupled with our established transmission tuning. We calibrate firmness and timing of shifts, so you’ll be guaranteed to feel the smoothness and better shift quality missing on the 5 speed Allison. If you’re like the rest of us here at the DmaxStore, using our trucks as daily drivers, the added gear helps take wear and tear off your engine while cruising at high speeds. It keeps your RPMs at the most efficient curve of the rev range, giving it the best ride possible!

In addition to helping keep your truck on the road longer, something you will notice is the added bump in fuel economy. This is especially true for those of us logging long commutes via highway. Less RPMs, the better your fuel economy. Picking up just a little bit goes a long way while putting on the commuting miles. You’ll also notice how much quieter your ride will be when adding our kit to your truck. NVH(Noise, vibration, and harshness) will decrease drastically, giving you a much more enjoyable ride. 

Take your '01-'05 Allison to a whole 'other level by adding a sixth gear!

• Custom TCM tuned for your specific truck

• Double Overdrive = 14% RPM reduction

• All new valve body with shift kit provisions already installed, wiring harness, and solenoids

• Lowered road noise

• Gear indicator works on Edge CTS monitor

• Works with high idle, retro fit tap shifters

DmaxStore Note:

• If a standard sump pan is being used, a 2006-2019 internal filter will need to be used.

•  will not work with 8.1L gas engine vehicles with Allison transmission.

*THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT IS NOT LEGAL IN CALIFORNIA.*

*Core Charge is for the TCM (Transmission Control Module)*