1989–1998 DODGE RAM 250/350 · 2500/3500 · 5.9L 12-VALVE CUMMINS
12-valve 5.9 Cummins upgrades in Tucson: more power that lasts.
The 12-valve loves fuel and air, but the transmission and cooling need to keep up. We build it in the right order, all installed at your location.
- 160–215 hp400–440 lb-ft stock
- VE or P7100mechanical pumps
- Auto · NV4500transmissions
- We come to youTucson & nearby
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KNOW YOUR TRUCK
First gen or second gen?
The injection pump changed in 1994, and that changes almost every fuel-system part. Your year tells us which you have.
First gen (VE pump)
- 160 hp / 400 lb-ft
- Bosch VE rotary injection pump
- Intercooler added mid-1991
- Ram 250/350
Second gen (P7100)
- 160–215 hp / 400–440 lb-ft (manuals rated higher)
- Bosch P7100 inline “P-pump”
- Ram 2500/3500
- Replaced by the 24-valve in mid-1998
PERFORMANCE UPGRADES
More power that lasts.
The 12-valve makes good power with more fuel and air, but the automatic transmission and cooling system have to keep up. We secure the fuel supply, airflow and cooling first, then upgrade the drivetrain. Gains depend on your truck.
Daily driver & light towing
- FASS fuel system (1994–1998)
- Banks Ram-Air intake (1994–1998)
- Gauges for exhaust temp and boost
- Deeper transmission pan
Typical result: better throttle response and cooler exhaust temps.
Call nowRequest a quoteSerious towing
- Everything in Stage 1
- Rebuilt automatic with heavy-duty parts, or a heavy-duty clutch on manuals
- aFe Dana 80 rear cover
- Fresh cooling system
- Front end rebuilt with heavy-duty parts
Typical result: 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 12-valve 5.9 Cummins. Every truck is different, so call or request a quote for yours.
FASS fuel system
On 1994–1998 trucks, FASS replaces the factory mechanical lift pump and adds filtration.
Parts we install
- FASS Titanium Signature SeriesOur pickComplete replacement for the factory mechanical lift pump, made for 1994–1998 12-valve trucks.
Banks Ram-Air intake
A better intake lowers exhaust temps and helps the turbo.
Parts we install
- Banks Ram-Air intakeEnclosed cold air intake made for 1994–2002 5.9 Cummins trucks.
Transmission & differential
More fluid and better cooling are the first steps for the automatic and rear axle.
Parts we install
- aFe deep transmission panStart hereCast aluminum pan for 1994–2007 Dodge automatics (727, 518, 618 families), 3–4 quarts over stock.
- PPE deep transmission panHeavy-duty cast aluminum pan for 47RH, 47RE and 48RE transmissions.
- aFe Dana 80 rear coverTowingFor 1994–2002 trucks with the Dana 80; holds about 5 quarts versus about 4 stock.
KDP fix & reliability
The KDP fix is cheap insurance on every 12-valve.
Parts we install
- KDP tab kitOur pickLocks the dowel pin in place, done with a new front seal and gasket.
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 rebuildDeath wobbleTrack bar, tie rods, ball joints and steering box with heavy-duty parts.
RELIABILITY FIRST
Known weak points come first.
Before adding power, we make sure the 12-valve 5.9 Cummins’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 FASS, Banks, aFe, PPE and Bilstein.
See all the brands we install →OWNER QUESTIONS
12-valve 5.9 Cummins performance questions, answered.
How much power can a 12-valve make?
A lot, but the transmission and cooling system decide how much you can use. We’ll recommend a build that matches how you use the truck.
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.