As technology gets better, we see transmissions in trucks with more and more gears. Recently the Allison 6-speed was replaced with the 10-speed version. For older trucks, this can set them behind the competitors, both in terms of performance and fuel efficiency. A 6-speed conversion kit can take LB7 and LLY trucks to a whole new level of performance and drivability. 

If you are already in need of a valve body replacement due to slipping gears because of a weak or bad solenoid this kit is exactly what you'll want to swap in its place. The kit comes with an upgraded valve body combined with a 6-speed TCM. This upgraded TCM comes with updated shift schedules customized to your truck for the new gearing . Calibrated Power has been able to design one of the smoothest shifting 6-speed conversion kits there is. This kit will have your 15-year-old truck shifting like a 2018 model. It's also relatively simple to install and can easily be installed by someone who knows what they're doing in the shop or at home. Another option is to have Calibrated Power install it themselves in one of their upgraded transmissions (DT550, DT750, or DT1000), which is what you'll want if you're trying to make big power. 

If you're looking for any of these qualities out of your transmission then a 6-speed conversion is for you:

• Better MPG's
• Quieter Exhaust Drone On The Highway
• Smoother Shifting Transmission 
• Engine and Transmission Longevity
• Narrower Cruise Range to Meet Emissions Requirements

What's an RPO? Crucial Duramax Information!

This article will help you understand what an RPO is, how to find yours and when it will be needed.  An RPO or Regular Production Option is a GM-specific code, made up of 3 characters, that helps the manufacturer specify what configuration of options has been or needs to be applied to a vehicle. This can include anything from paint color to powertrain options. For Chevy/GMC Duramax trucks each type of engine can be signified by a different RPO code.

It’s common diesel knowledge that one of the weak points of the 2001-2004 Duramax diesel trucks is that the injectors will go bad. It’s something all of us LB7 drivers have had to deal with, the dreaded injector job. We’ve all been there or we are all about to get there.  First thing we will discuss is some of the issues you may experience when your LB7 injectors go bad.

The Six Speed Conversion Kit from duramaxtuner.com has been unleashed and it’s a proven winner.  The fifth gear days of yore have passed the world by and the 2001-2005 LB7 and LLY owners are loving how much more the extra gear brings them.  Large amounts R&D and testing has given 5 speeds a better shift schedule and the highest quality 5-6 and 6-5 shifts. The upgraded valve body with have your aging truck shifting like a new model.

What crashes an LB7 and LLY ECMs?:

If you have a 2001 - 2004 (LB7) or 2004.5 - 2005 (LLY) Duramax and have been thinking about tuning it, this article is for you. 

As you're probably aware, ECMs have some small risk of crashing during a tuning flash.  Browsing the forums online you definitely already picked up on the fact that the LB7 and LLY ECMs are more suscepitble to the issue.

To make sure you aren't stuck stranded somewhere far from home follow these tips: 

• Disconnect all aftermarket electronics
• Make sure your batteries are at a full charge
• Flash your truck at home or a local garage

6 Speed Conversion Kit for the LB7 & LLY 5 Speed Allison:

Your 2001-2005 Silverado/Sierra HD diesel is powered by either the LB7 (2001-2004) or LLY (2004.5-2005) Duramax.  That Duramax is tied to one of the most popular automatic transmissions, the Allison 1000.

While the Allison 1000 was a big step forward, it still needed improvement.  The LB7/LLY models came with 4 gears and Overdrive, or "5 speed".   In 2006 General Motors (GM) released the 6 Speed transmission for the new at the time LBZ model and other HD trucks. 

Without getting too technical about how automatic transmissions work, they did not actually add a physical gear.  The Allison works through a series of clutch packs being applied with hydraulic pressure to create different gear ratios.  What GM actually did was design a brand new valve body and improved tuning to achieve the 6 speed Allison 1000.

DuramaxTuner.com now has a 6 Speed Conversion Kit which includes a new valve body and custom tuned TCM that allows your truck to achieve 6th gear.  

Who Will The 6 Speed Conversion Kit Help?

• Owners wanting a quieter ride
• Drivers looking for a smoother shifting transmission
• Highway commuters

5 to 6 Speed Allison Conversion:

The Allison 1000 transmission equipped in the 2001-2005 HD Silverado and Sierra was considered to be revolutionary when it was released. 

Owners rave about the smoothness and reliability of the 5 speed Allison transmissions.  They're able to reliably handle the strain of towing heavy and still have reasonable street manners for commuting.  Duramaxtuner has recently invested considerable time into the AL5 controller to build out the shift shedule and quality of all the 5-6 and 6-5 shifts.  Matched with our upgraded valvebody this kit will have your 15 year old truck shifting like a 2018 model. 

As most technology has advanced over the last 12+ years, so has transmission technology.  You've probably noticed that just about everything on wheels has more gears these days.  Starting in 2006 all Duramax powered GM trucks were given an extra overdrive gear (.61).  Since then, they haven't looked back. 

Why is that?  Why does your truck need more gears? 

Benefits from more gears:

• MPG improvement 
• Noise Reduction
• Parts Longevity
• Narrower Cruise range to meet Emissions Requirements

We have lowered our MAP pricing on the Stealth 64 Turbo:

Calibrated Power, home of DuramaxTuner.com, has ramped up in-house production of the Stealth Turbo line.  This added capacity and volume of turbo production has provided an opportunity to lower MAP pricing on all Duramax models and allowed the Cummins 5.9L Stealth 64 to be a low price and top quality leader in it's category. 

Our Stealth 64 Turbo's are:

• Made in the USA!
• Upgraded, Drop-In Replacement!
• Quick Spooling with Big POWER!

640HP with this completely drop-in turbo:

The Drop-In turbo options for your 2001-2004 GM diesel Duramax are generally limited to about 600 RWHP.  Finally there is an option to take your truck that little bit extra without sacrificing drive-ability. 

The new Stealth 64 G2 is a direct replacement for your stock turbo.  It requires no additional hardware, pedestal, coolant line re-route or anything else.  Utilize your factory down pipe and retain a completely stock appearing turbo.

Stealth 64 G2 Unique Features:

• 640 RWHP capable
• Stock-like spool up
• Great for towing and performance

640HP with this completely drop-in turbo:

The Drop-In turbo options for your 2001-2004 GM diesel Duramax are generally limited to about 600 RWHP.  Finally there is an option to take your truck that little bit extra without sacrificing drive-ability. 

The new Stealth 64G2 is a direct replacement for your stock turbo.  It requires no additional hardware, pedestal or coolant line re-route.  Utilize your factory down-pipe and retain a completely stock appearing turbo while being able to make up to 640RWHP. 

Stealth 64 G2 Unique Features:

• 640 RWHP capable
• Stock-like spool up
• Great for towing and performance