Eaton Fuller 8LL Transmission for Sale | OEM Used 8-Speed Manual with Low-Low Deep Reduction Split | Vocational / Heavy-Haul Class 8 Manual
$3,400.00
At a Glance
- Condition: OEM used, all 8 forward gears tested with Low-Low function verified
- Availability: In stock, Eaton Fuller 8LL transmissions available
- Shipping: 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 required
- Backed by a 15 day replacement warranty against internal defects
Description
About the Eaton Fuller 8LL Transmission
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 Part Nests 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.
The Eaton Fuller Heavy-Duty Manual Family Position
The 8LL occupies the vocational and severe-duty position in the Eaton Fuller heavy-duty manual transmission family. For buyers researching across the family: the 18-speed Roadranger (RTLO-18918 / RTLO-22918, our vaz130 listing) is optimized for long-haul highway use with closer ratio spacing and overdrive cruising; the 8LL (this listing) is optimized for vocational and severe-duty operations requiring deep-reduction low gears. The two are different transmissions for different duty cycles, not interchangeable. Highway fleet owner-operators typically choose the 18-speed; vocational operators (concrete mixers, dump trucks, logging trucks, mining haulers) typically choose the 8LL for the deep Low-Low gear that the 18-speed lacks.
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 Low Range allows:
- Loaded dump truck start on 15-plus percent 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 (our vaz85 listing), 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 (our vaz120 listing), Volvo D11
- Mack Engines: Mack MP8, Mack MP7
Condition of Products
Our 8LL transmissions for sale are all used, but they undergo rigorous inspection and certification processes. We ensure that every transmission is in excellent working condition, with good gears, verified Low-Low deep reduction function, and verified High Range road gear operation.
Vehicle Compatibility
| Vehicle | Compatibility |
|---|---|
| Construction | Mack Granite, Peterbilt 567, Kenworth T880 |
| Logging / Forestry | Western Star 4900, Freightliner 122SD, Volvo VHD |
| Mining | CAT 770G, Komatsu 830E, Terex MT4400AC |
| Heavy Hauling | Kenworth W990, Peterbilt 389, Volvo VNL |
| Off-Road / Military | Oshkosh HEMTT, BAE RG33 MRAP, Navistar MaxxPro MRAP |
| Vocational Long-Haul | Freightliner Cascadia, Volvo VNL, International LT |
Inspection Workflow
- Model designation confirmed (8LL variant identification)
- Donor vocational/severe-duty truck confirmed (construction, logging, mining, heavy-haul, military)
- Engine pairing confirmed
- All 8 forward gears tested through both Low Range (deep reduction) and High Range (road) positions
- Low-Low deep reduction function verified specifically (the defining 8LL feature)
- High Range road gear operation confirmed
- Air-actuated range selector valve verified
- Reverse tested
- Clutch brake function verified
- Bell housing bolt pattern confirmed
- Output yoke and spline count verified
Why Buy From Part Nests
- 8LL model designation confirmed
- Donor truck and application type confirmed
- All 8 forward gears tested
- Low-Low deep reduction verified specifically (the defining 8LL feature)
- High Range road gears verified
- Air system operation confirmed
- Free freight pallet delivery to all 50 states
- 15 day replacement warranty on internal defects
- Vocational/heavy-haul-experienced support team
- Call (240) 306-7051 to confirm 8LL model designation (vocational / severe-duty Low-Low deep reduction, NOT the 18-speed Roadranger highway transmission per our vaz130 listing), donor vocational truck application (construction, logging, mining, heavy-haul, military), and engine pairing before ordering
15 Day Replacement Warranty
Every used Eaton Fuller 8LL transmission purchased through Part Nests carries a 15 day replacement warranty starting on the delivery date.
What Is Covered
- Internal defects already present when the transmission arrives
- Gear or shaft failures within 15 days from installation
- Loss of any of the 8 forward gears or reverse within 15 days from installation
- Low-Low deep reduction failures within 15 days from installation (where Low-Low was documented as functional at shipping)
- Range selector air valve failures within 15 days from installation
- Internal bearing failures within 15 days from installation
- Case crack failures not disclosed at shipping
- Incorrect model designation shipped (8LL vs 18-speed Roadranger) due to an error on our end
What Is Not Covered
- Damage caused during installation
- Damage from operating with incorrect gear oil (use Eaton-approved synthetic transmission lubricant only; consult Eaton spec sheet)
- Damage from neglected fluid maintenance
- Damage from operating beyond the torque rating (1,400 to 2,050 lb-ft depending on specific 8LL configuration; aggressive aftermarket engine tuning beyond these ratings stresses the transmission beyond design limits)
- Damage from incorrect clutch hardware or pilot bearing
- Damage from operating with low or contaminated air supply (the range selector system requires clean dry compressed air per Eaton specifications)
- Damage from incorrect bell housing alignment or clutch brake adjustment
- External components (driveshaft, transmission mount, shift lever, air lines and valves, clutch hardware, flywheel) unless itemized
- Labor expenses of any kind
To start a warranty claim, reach us within 15 days of delivery at (855) 634-4447.
- 8LL Model Designation Confirmed: Vocational / severe-duty Low-Low (NOT the 18-speed Roadranger per vaz130)
- All 8 Forward Gears Tested: Through both Low Range and High Range positions plus reverse
- Low-Low Deep Reduction Verified: 12.64:1 first gear specifically tested (the defining 8LL feature)
- Range Selector Air Valve Verified: Air-actuated range system operation confirmed
- Donor Vocational Truck Confirmed: Construction, logging, mining, heavy-haul, or military origin documented
- 15 Day Replacement Cover: Internal defects protected from delivery onward
Additional information
| bellhousing-to-tailshaft-length | 36 inches |
|---|---|
| fluid-capacity | 30 liters |
| gear-ratios | Low range: 12.64, 8.72, 6.07, 4.17. High range: 1.00, 0.87 |
| overall-length | 47 inches |
| torque-rating | 1, 400 lb-ft to 2, 050 lb-ft |
| weight | 500 lbs |
| type | 8LL Transmission |
12.64:1 ultra-low first gear for severe-duty starts. 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 highway transmissions like the Eaton RTLO-18918 18-speed (our vaz130 listing, lowest gear 14.66:1 but with much closer ratio spacing for highway use). The Low-Low allows: loaded dump truck start on 15-plus percent grades (construction site operations), concrete mixer drum rotation under power while creeping (controlled discharge on grades), logging truck pull-out from forest roads (heavy timber loads on poor surfaces), mining haul truck operation (sustained low-speed high-torque), heavy-haul tractor start with oversize / overweight loads (specialized hauling). The Low-Low is the reason vocational operators choose the 8LL over the 18-speed.
Vocational / severe-duty vs highway. The 8LL (this listing) is optimized for vocational and severe-duty operations: construction, logging, mining, heavy-haul, refuse, and similar applications requiring deep-reduction Low-Low for heavy starts on grades. The 18-speed Roadranger RTLO-18918 / RTLO-22918 (our vaz130 listing) is optimized for long-haul highway use with closer ratio spacing for sustained highway speeds and an overdrive 9th gear (3.42:1) for fuel-efficient cruising. The 18-speed has more total gears (18 vs 8) but the 8LL has the deeper Low Range that some vocational operations require. Construction trucks, dump trucks, concrete mixers, logging trucks, and mining haulers typically choose the 8LL; line-haul tractors typically choose the 18-speed.
8LL-specific shifter pattern allowing range shifts. The 8LL uses a double H-shift pattern (sometimes called the low-low shift pattern or 8LL pattern) that arranges the 4 main gear positions in two H patterns: one H pattern for Low Range deep-reduction gears (Low-Low, 1L, 2L, 3L), and one H pattern for High Range road gears (1H, 2H, 3H, 4H). The driver shifts between the two H patterns via the air-actuated range selector (typically a button or switch on the shift knob). The double H pattern provides quick access to both the deep-reduction starting gears and the highway cruising gears without complex multi-button operation. Experienced 8LL drivers learn to anticipate range shifts before the gear change.
Construction, logging, mining, heavy-haul, military, refuse. Construction trucks: Mack Granite (dump trucks, concrete mixers, vocational), Peterbilt 567 (vocational), Kenworth T880 (vocational), Freightliner 122SD (severe-duty). Logging and forestry: Western Star 4900, Volvo VHD vocational, log trucks across major OEMs. Mining: Caterpillar 770G off-highway truck, Komatsu 830E electric drive mining truck, Terex MT4400AC mining truck (the 8LL is used in articulated mining haulers under approximately 100 tons; larger mining haulers use specialty transmissions). Heavy hauling: Kenworth W990, Peterbilt 389, Volvo VNL (heavy-haul calibrations). Off-Road / Military: Oshkosh Defense HEMTT, BAE Systems RG33 MRAP, Navistar MaxxPro MRAP. Refuse: front-loader and side-loader refuse trucks in vocational configurations.
Heavy-duty Class 8 diesels across all major manufacturers. Cummins ISX15, ISM, L9. Caterpillar C13, C15 (our vaz85 listing), 3406 (older Cat). Detroit Diesel Series 60 (older), DD13, DD15. PACCAR MX-13, MX-11. International A26, N13. Volvo D13 (our vaz120 listing), D11. Mack MP7, MP8 (the MP8 is the same engine family as the Volvo D13 per our vaz120 listing). The bell housing pattern is SAE #1 Class 8 standard, the same as used with the 18-speed Roadranger per our vaz130 listing. We confirm the engine pairing on every order; the engine determines the bell housing pattern variant and the appropriate Low-Low ratio specification (some 8LL variants have different Low-Low ratios optimized for different engine torque outputs).
1,400 to 2,050 lb-ft depending on configuration. The 8LL is available in multiple torque ratings to match various engine outputs. Base 8LL variants handle 1,400 lb-ft for medium-duty vocational applications. Higher-rated 8LL variants handle 2,050 lb-ft for severe-duty heavy-haul and mining applications. The torque rating is determined by internal hard parts specifications (gear material strength, shaft diameter, bearing capacity, case reinforcement). For engines producing the highest torque outputs (Cummins X15 high-output, Cat C15 high-output per vaz85, Volvo D16), the higher-rated 8LL variant is required. We document the torque rating on every 8LL we ship; over-torquing the transmission beyond its rating causes accelerated gear and shaft wear.
Yes, the 8LL uses the same synchronizer-free architecture as the 18-speed. Like the Eaton 18-speed Roadranger (our vaz130 listing), the 8LL is constructed without synchronizers on the main gear engagement. This makes it durable but requires the driver to either traditional double-clutch (pressing the clutch twice for each shift) or float-shift (matching engine RPM to road speed precisely and shifting without the clutch). Float-shifting is the technique experienced Class 8 drivers prefer for vocational operation; it reduces driver fatigue and extends clutch life. The 8LL has an additional consideration: the Low-Low gear is engaged from a stop using the clutch brake (similar to starting from 1L on the 18-speed), so the clutch brake function and adjustment are critical for clean Low-Low engagement.
No. There is no core return required.
Maximilian D. –
Got an 8LL for a Mack Granite dump truck replacement. Model designation correctly identified as 8LL (vocational / severe-duty, NOT the 18-speed Roadranger highway transmission per vaz130), all 8 forward gears tested, Low-Low deep reduction function specifically verified clean (12.64:1 first gear). Honest pre-purchase information about the Eaton family choice between 8LL (vocational, this listing) and 18-speed Roadranger (highway per vaz130) and the double H-shift pattern.
Theodora N. –
Sourced an 8LL for a logging truck replacement. Donor application correctly identified as vocational / logging, range selector air valve verified, Low-Low function tested specifically. Honest pre-purchase information about the engine pairing options (Cummins ISX15, Cat C15 per vaz85, Volvo D13 per vaz120) and the torque rating variants (1,400 to 2,050 lb-ft depending on 8LL configuration). Foundation for the logging operation continuing service.