2001–2004 CHEVY SILVERADO / GMC SIERRA HD · 6.6L DURAMAX LB7
LB7 Duramax upgrades in Tucson: more power that lasts.
The LB7 has no factory lift pump and a transmission that doesn’t love big power. We upgrade it in the right order, fuel and cooling first, all installed at your location.
- 300 hp520 lb-ft stock
- Common railBosch CP3 pump
- Allison 10005-speed automatic
- We come to youTucson & nearby
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KNOW YOUR TRUCK
Is it an LB7? It changes the parts.
GM switched from the LB7 to the LLY partway through 2004. The 8th digit of your VIN tells us which one you have.
LB7 (VIN 8th digit “1”)
- 300 hp / 520 lb-ft
- Injectors under the valve covers
- Fixed-geometry turbo
- No EGR, no DPF
- Allison 1000 5-speed or ZF6 manual
LLY (VIN 8th digit “2”)
- 310 hp / 605 lb-ft
- Injectors moved outside the valve covers
- Variable-geometry turbo
- Different intercooler, intake and injectors
- See the LLY & LBZ guide →
PERFORMANCE UPGRADES
More power that lasts.
The LB7 makes big power easily, but fuel supply and the Allison are the limits. We add fuel and cooling first, then air and tuning with the transmission in mind. Gains depend on your truck.
Daily driver & light towing
- FASS lift pump
- Banks Ram-Air intake
- Gauges for exhaust temp and transmission temp
- PPE deep Allison pan
- Banks Ram-Air differential cover
Typical result: steadier fuel, cooler temps and better pulling.
Call nowRequest a quoteSerious towing
- Everything in Stage 1
- Mishimoto intercooler and radiator
- Emissions-legal Edge tuning matched to your transmission
- Allison rebuilt with heavy-duty parts
- Front end rebuilt with heavy-duty parts
Typical result: strong, steady towing with temperatures under control.
Call nowRequest a quoteUPGRADES BY CATEGORY
Pick a category to see the parts we install.
Tap a tile to see what it does and the parts we install on the LB7 Duramax. Every truck is different, so call or request a quote for yours.
FASS lift pump
The LB7 has no factory lift pump. A FASS pushes clean, steady fuel to the CP3 and protects the injectors.
Parts we install
- FASS Titanium Signature SeriesStart hereLift pump with water separation and filtration, made for 2001–2010 Duramax LB7 through LMM, preset at 8–10 psi.
Banks Ram-Air & intercooler
A better intake and intercooler lower exhaust temps and help the turbo.
Parts we install
- Banks Ram-Air intakeEnclosed cold air intake made for the 2001–2004 LB7, oiled or dry filter.
- Mishimoto intercooler kitBar-and-plate intercooler with pipes for 2002–2004 LB7 trucks, lifetime warranty.
Tuning
On an LB7, tuning should match the Allison. We confirm what’s available and legal for your truck.
Parts we install
- Edge Evolution CTS350-state legalFlash tuner and touchscreen monitor for 2001–2016 Duramax trucks (CARB EO D-802-13).
- Edge Juice with Attitude CTS3Plug-in tuner and touchscreen monitor made for the 2001–2004 LB7, with exhaust temp safety backdowns.
Radiator & transmission cooler
Fresh cooling parts are the cheapest way to keep an LB7 healthy in the heat.
Parts we install
- Mishimoto aluminum radiatorDirect-fit radiator for 2001–2005 Duramax trucks, lifetime warranty.
- Mishimoto transmission coolerTowingMade for 2003–2005 LB7 and LLY trucks.
Transmission & differential
More fluid and better cooling are the first steps for the Allison 1000.
Parts we install
- PPE deep Allison panStart hereCast aluminum pan that holds about 4 extra quarts, with cooling fins and a magnetic drain plug.
- Banks Ram-Air differential coverTowingRear cover for the AAM 11.5-inch axle with air scoops and cooling fins.
Shocks & front end
We don’t do wheel or tire work.
Parts we install
- Bilstein 5100 shocksFirmer, more controlled ride loaded or empty.
- Front-end rebuildIdler arm, pitman arm, tie rods and ball joints with heavy-duty parts.
RELIABILITY FIRST
Known weak points come first.
Before adding power, we make sure the LB7 Duramax’s known weak points are handled, so the upgrade lasts.
How mobile service worksTell us your truck and where it is, we diagnose on site, you approve a written estimate, and we fix it where it sits.
See how it works →Name-brand partsWe install proven brands like Banks, FASS, Mishimoto, Edge, PPE and Bilstein.
See all the brands we install →OWNER QUESTIONS
LB7 Duramax performance questions, answered.
Will more power hurt my Allison?
It can. The stock Allison has limits. We match power to the transmission and add cooling, or rebuild it with heavy-duty parts if you want more.
Are your upgrades street legal?
We install emissions-compliant parts and don’t do deletes.
Do you install at my location?
Most upgrades, yes. We come to your home, shop or job site around Tucson.
LET’S TALK ABOUT YOUR TRUCK
Call, text or request a quote.
Tell us your year, mileage and what you want done. We’ll recommend the right build, quote it and come to you.