66RFE PERFORMANCE TRANSMISSION 550 HP 12-18
$6,650.00
RedLine engineers the “550” 66RFE for truck owners who demand more than reliability. We build this transmission with serious upgrades, including a reinforced overdrive drum, to deliver uncompromising strength and performance. Whether you tow heavy, daily drive, or push extra horsepower through your truck, this build handles the pressure with ease.
Our team completely disassembles each transmission, cleans every component, machines critical parts to exact tolerances, and reassembles the unit with premium upgrades that correct factory weak points. We add the reinforced overdrive drum to increase durability where the 66RFE needs it most, giving you more holding power and confidence under extreme loads.
The result: a cooler-running, longer-lasting 66RFE that gives you the confidence to tackle both work and play without compromise.
Horsepower Rating: 550 Rear Wheel
Warranty: 18 Month Craftsmanship Warranty
This transmission build includes:
- New Torque Converter with Billet Cover
Billet Overdrive Drum (Adds 40% more clutch material to the drum)
- RedLine Transmissions Custom Built High-Pressure Billet Valvebody
- Blueprint Hard Parts Inspection
- Precision Assembly
- RedLine Modified Front Pump
- Billet accumulators and Upgraded Retainer Plate
- Cleaning of Case and all internal components
- New Bonded Pistons
- New MOPAR Filters
- Clutches and Steels (Increase holding capacity with additional clutches in OD & 2C
- All New Bearings
- Gaskets and Seals
- Upgraded Solenoid Pack
- Deep Aluminum Transmission Pan
- Bead Blasted Transmission Case
- Painted in High-Quality Enamel Paint
2012–2018: 66RFE is found in Ram 2500/3500 trucks with the 6.4L HEMI.
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About Our Build
Professional Foundation
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Professional Disassembly, Cleaning, and Bead-Blast Case
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Removes all contamination and restores the housing to like-new condition, ensuring reliability and preventing early wear.
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Precision Assembly of Clutches, Steels, and Clearances
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Guarantees correct tolerances for smooth shifting and long-term durability.
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Enhanced Internal Components
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New Bonded Pistons, Clutches, Steels, Gaskets, Seals, and Bearings
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Replaces all wear items with brand-new parts for a fresh, stronger-than-stock foundation.
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Additional Clutches in Overdrive and 2C
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Increases holding power in critical gears, preventing slippage under heavy load or high horsepower.
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Control & Pressure Upgrades
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Upgraded Solenoid Pack
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Provides improved electronic control for more consistent and reliable shifting.
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RedLine High-Pressure Precision-Machined & Assembled Front Pump
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Maintains stable line pressure, reducing heat and clutch failure under stress.
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RedLine Precision-Machined & Assembled Valvebody with Upgraded SSV Valve
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Eliminates factory valvebody issues, ensures crisp shifts, and extends transmission life.
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Billet Accumulators & Upgraded Retainer Plate
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Reinforces high-stress areas, preventing failures in heavy-duty and performance use.
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Torque Handling & Cooling
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New Torque Converter with Billet Cover
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Stronger lock-up, reduced heat, and greater torque transfer efficiency compared to stock.
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Deep Aluminum Transmission Pan
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Increases fluid capacity for cooler operating temperatures and longer fluid life, plus added strength against warping or leaks.
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Installation
Installation Available by our Team of Experts.
At RedLine Transmissions, we specialize in transmission installs for Dodge RAM Cummins. With over 2,000 installations completed, our expert team brings unmatched experience and craftsmanship to every build—driven by precision, pride, and meticulous attention to detail.
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