66RFE PERFORMANCE TRANSMISSION 450 HP 12-18
$5,650.00
The RedLine "450" 66RFE is engineered for truck owners who expect uncompromising strength and performance. Whether you’re towing heavy loads, daily driving, or putting extra horsepower through your truck, this build is designed to handle the pressure. Each transmission is fully disassembled, thoroughly cleaned, precision-machined, and carefully reassembled with upgraded components that correct factory weak points. The end result is a 66RFE that runs cooler, lasts longer, and delivers the confidence you need for both work and play.
Horsepower Rating: 450 Rear Wheel
Warranty: 12 Month Craftsmanship Warranty
This transmission build includes:
- New Torque Converter with Billet Cover
- 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
- 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.
Quantity
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.
Warranty
This transmission build includes a 12 month, unlimited-mile craftsmanship warranty to the original purchaser. To view our full warranty click here.
Warranty
This transmission build includes a 12 month, unlimited-mile craftsmanship warranty to the original purchaser. To view our full warranty click here.
In-House Installation
Allow our team of professionals to install your transmission. We offer In-house installation which includes removal and replacement of your transmission, cleaning the contamination of the cooler and lines with our hot flush machine, proper installation and adjustment of all components, transmission reset and relearn, and a final test drive to make sure the transmission is functioning as expected.
Round Trip Shipping
We can handle round-trip shipping to and from your local shop, delivering your rebuilt transmission and returning your core via a prepaid shipping label for a simple, stress-free process.
If you would like to avoid the core deposit, you have the option to send us your transmission to be rebuilt. Our team will send you the appropriate paperwork and arrange the carrier to pick up your transmission. Once it’s built, it will be on its way back to you.
RedLine Refresh Program
Your transmission is built to last, but once the warranty is up, when it needs service, the RedLine Refresh Program is here. We inspect and refresh your transmission at a lower cost than a full rebuild, helping you keep your truck on the road long term.
