Eaton Fuller 8LL Transmission for Sale | 8-Speed Manual with Low-Low Deep Reduction Split | Vocational / Heavy-Haul Class 8 Manual

$2,499.00

Product Overview & Specifications

In Stock, Eaton Fuller 8LL Transmissions Available
Free Shipping to All 50 States via Freight Pallet, 5 to 10 Business Days
Model Designation Confirmed (8LL Variant)
Donor Vocational Truck Confirmed (Construction, Logging, Mining, Heavy-Haul, Military)
All 8 Forward Gears Tested
Low-Low Deep Reduction Function Verified Specifically
High Range Position Function Confirmed
Air-Actuated Range Valve Operation Verified
Reverse Gear Tested
Clutch Brake and Bell Housing Bolt Pattern Confirmed
100% Inspection Before Every Order Ships
No Core Charge, Keep Your Old Transmission

100% Fitment Assistance

15 Days Replacement Warranty

Free & Fast Shipping

Category: Transmission

Description
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Affordable 8LL Transmission for Sale

An 8LL transmission is known for its versatility and strength, ideal for heavy-duty applications such as construction, logging, mining, heavy hauling, and severe-duty vocational work. This 8LL Transmission for Sale at our store offers a wide range of gear options including the critical low-low deep reduction first gear (12.64:1), making it suitable for various challenging driving conditions, from starting heavy loads on steep job-site grades to highway cruising in the High Range overdrive gears.

About the Eaton Fuller 8LL Transmission

The Eaton Fuller 8LL transmission is a robust, heavy-duty manual transmission renowned for its versatility across vocational and heavy-haul Class 8 truck applications. Designed to handle the toughest conditions, these transmissions are an excellent choice for both on-road and severe-duty off-road vehicles. Our 8LL transmissions for sale are carefully selected, inspected, and certified to ensure they meet the highest standards of quality and reliability.

What Makes the 8LL Different: The Low-Low Deep Reduction Split

The defining feature of the 8LL is the low-low deep reduction gear split that adds an ultra-low 12.64:1 first gear. This is significantly deeper than the lowest gear in standard road transmissions like the Eaton RTLO-18918 18-speed (lowest gear 14.66:1 but with much closer ratio spacing for highway use). The 8LL’s deep Low Range allows:

Loaded dump truck start on 15%+ grade: Critical for construction site operations

Concrete mixer drum rotation under power while creeping: Allows controlled discharge on grades

Logging truck pull-out from forest road: Heavy timber loads on poor surfaces

Mining haul truck operation: Sustained low-speed high-torque applications

Heavy-haul tractor start with oversize/overweight loads: Specialized hauling

Features of the 8LL Transmission

Versatility: Designed for heavy-duty vocational and severe-duty trucks, the 8LL offers versatility in handling different conditions, from urban construction sites to rugged off-road and severe-duty terrain.

Gear Range: Provides a wide range of gears with the deep-reduction Low-Low, allowing precise control and efficient power delivery across both starting and cruising conditions.

Durability: Built on the proven Eaton Fuller twin-countershaft architecture, the 8LL transmission is known for its durability and reliability in demanding applications like construction, logging, and heavy hauling.

Shift Patterns: Employs a double H-shift pattern (sometimes called the “low-low shift pattern” or “8LL pattern”) that allows easy shifting between Low Range deep-reduction gears and High Range road gears via the air-actuated range selector.

Power Handling: Capable of handling high torque and horsepower outputs (1,400 to 2,050 lb-ft), making it suitable for the heaviest commercial loads and severe-duty applications.

Efficiency: Designed to maximize mechanical efficiency through direct manual power delivery while supporting the deep-reduction starting needed for heavy loads.

Compatibility: Available in various configurations to suit different truck models and engine setups, ensuring compatibility with vocational and heavy-haul applications across major Class 8 manufacturers.

Maintenance: Designed for ease of maintenance with accessible components and service points to minimize downtime in vocational and fleet applications.

8LL Transmission Fits

Vehicles by Application Category:

Construction: Mack Granite, Peterbilt 567, Kenworth T880

Logging and Forestry: Western Star 4900, Freightliner 122SD, Volvo VHD

Mining: Caterpillar 770G Off-Highway Truck, Komatsu 830E Electric Drive Mining Truck, Terex MT4400AC Mining Truck

Heavy Hauling: Kenworth W990, Peterbilt 389, Volvo VNL (heavy-haul applications)

Off-Road Applications: Oshkosh Defense HEMTT (Heavy Expanded Mobility Tactical Truck), BAE Systems RG33 MRAP (Mine-Resistant Ambush Protected vehicle), Navistar MaxxPro MRAP

Long-Haul Transportation: Freightliner Cascadia (vocational variants), Volvo VNL (vocational), International LT Series

Compatible Engines:

Cummins Engines: Cummins ISX15, Cummins ISM, Cummins L9

Caterpillar Engines: Caterpillar C13, Caterpillar C15, Caterpillar 3406 (older)

Detroit Diesel Engines: Detroit Diesel Series 60 (older), Detroit Diesel DD13, Detroit Diesel DD15

PACCAR Engines: PACCAR MX-13, PACCAR MX-11

International Engines: International A26, International N13

Volvo Engines: Volvo D13, Volvo D11

Mack Engines: Mack MP8, Mack MP7

bellhousing-to-tailshaft-length	36 inches
fluid-capacity	30 liters
gear-ratios	0.87, 4.17. High range: 1.00, 6.07, 8.72, Low range: 12.64
overall-length	47 inches
torque-rating	050 lb-ft, 1, 400 lb-ft to 2
weight	500 lbs
type	8LL Transmission
Model	8LL (RTLO-14908LL typical)
maker	Eaton Fuller
speeds	8 forward gears, low-low gear split
shift-pattern	Double H-shift (low-low) pattern
compatibility	Multiple vocational/heavy-haul truck applications
price	$2, 499.00

FAQs

What is the inspection process for these used 8LL transmissions?

Every 8LL transmission is thoroughly inspected by our technicians and tested through both Low Range (deep reduction) and High Range (road) positions to verify all 8 forward gears engage cleanly. The Low-Low deep reduction function is specifically verified since this is the defining 8LL feature. Air system operation and clutch brake function are also tested.

What does the “LL” in 8LL mean?

The “LL” stands for “Low-Low”, referring to the deep reduction Low Range gear set that’s split from the High Range road gears via the air-actuated range selector. The 8LL has 4 Low Range deep-reduction gears (12.64, 8.72, 6.07, 4.17) for starting heavy loads on grades, and 2 High Range road gears (1.00 direct, 0.87 overdrive) for cruising.

What maintenance is required for an 8LL transmission?

Regular maintenance is essential to ensure the longevity and performance of an 8LL transmission. This includes checking and replacing transmission fluid (Eaton-approved Roadranger CD-50 synthetic typically every 250,000 to 500,000 miles), inspecting clutch components, ensuring proper air pressure to the range selector valve, and verifying clutch brake function.

Can an 8LL transmission be rebuilt or repaired?

Yes, like most Eaton Fuller manual transmissions, the 8LL can be rebuilt or repaired by skilled Eaton-certified technicians and independent transmission specialists. Rebuilding may involve replacing worn-out components such as gears, bearings, seals, and the air range valve, to restore the transmission to like-new condition. Many 8LL transmissions deliver 800,000+ miles between major rebuilds in vocational service.

Is an 8LL transmission fuel-efficient compared to other types of transmissions?

The fuel efficiency of an 8LL transmission can vary depending on driving conditions, load, and how well it is matched to the vehicle’s engine and application. For vocational and severe-duty applications, the 8LL is well-matched: the deep Low Range allows efficient starting under heavy loads (reducing clutch slippage and fuel waste), and the High Range overdrive (0.87) provides reasonable highway fuel efficiency for vocational trucks. For pure long-haul highway service, however, the 13-speed or 18-speed transmissions with multiple overdrive gears deliver better fuel economy.

What applications is the 8LL designed for?

The 8LL is specifically designed for: – Construction: Dump trucks, mixer trucks, articulated dump trucks on steep job sites – Logging / Forestry: Heavy timber haulers on forest roads – Mining: Off-highway haul trucks and mining service vehicles – Heavy Hauling: Oversize/overweight specialized hauling – Military: Heavy-haul tactical and MRAP vehicles – Severe-Duty Vocational: Oilfield service, fire trucks, refuse, utility