RTLO-18918B | Eaton Fuller 18-Speed Roadranger Transmission — Remanufactured by DPX (Double Overdrive)
The Eaton Fuller RTLO-18918B is a heavy-duty 18-speed with double overdrive (0.86 & 0.73) and 4 reverse ranges. Remanufactured in Mansfield, Ohio by Discount Parts Exchange - DPX. Every unit is torn down, cleaned, inspected, and rebuilt with new bearings, seals, and synchros.
Call DPX to confirm: 419-522-3320.
Summary
18-speed double-overdrive transmission with air-actuated range & splitter. Rated to 1,850 lb-ft. Internal oil pump. Dry weight ~716 lb. Case length 33.1 in. Sold on exchange by Discount Parts Exchange - DPX.
Highlights
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Model: RTLO-18918B
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Gears: 18 forward / 4 reverse
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Final Overdrive: 0.73 (double OD: 0.86 and 0.73)
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Torque Rating: 1,850 lb-ft
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Dry Weight: ~716 lb
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Length: 33.1 in
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Internal Oil Pump: Yes
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Shift System: Manual main; air range & splitter (aux section)
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Applications: Long-haul / heavy OTR, grades, high-gross combinations
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Common Service Parts: Output shaft nut K-4122 | Seal kit K-2918
Gear Ratios — Forward (RTLO-18918B)
RTLO-18918B Forward Ratios
| Gear |
Ratio |
| 8th High (OD2) |
0.73 |
| 8th Low (OD1) |
0.86 |
| 7th High |
1.00 |
| 7th Low |
1.17 |
| 6th High |
1.38 |
| 6th Low |
1.62 |
| 5th High |
1.95 |
| 5th Low |
2.29 |
| 4th High |
2.73 |
| 4th Low |
3.20 |
| 3rd High |
3.74 |
| 3rd Low |
4.38 |
| 2nd High |
5.16 |
| 2nd Low |
6.05 |
| 1st High |
7.30 |
| 1st Low |
8.56 |
| Low High |
12.29 |
| Low Low |
14.40 |
Gear Ratios — Reverse (RTLO-18918B)
RTLO-18918B Reverse Ratios
| Range |
Ratio |
| Reverse High-High |
3.43 |
| Reverse High-Low |
4.03 |
| Reverse Low-High |
12.85 |
| Reverse Low-Low |
15.06 |
Overall ratio coverage: 19.7:1
Low Inertia Concept
“L” = Low Inertia. Fuller’s patented design uses a mainshaft not splined to the auxiliary drive gear, reducing rotating mass and drag for quicker, smoother upshifts — especially when moving range and splitter together.
What’s Included
- Remanufactured Eaton Fuller RTLO-18918B transmission rebuilt to factory spec by Discount Parts Exchange - DPX
- 12-month, unlimited-mileage parts-only warranty
- Inspected for correct gear mesh and shift quality
Optional Services
- Shift tower rebuild (Fuller S-2129)
- PTO rebuilding and setup
Recommended Lubricant
Use Eaton PS-386 approved synthetic SAE 50 manual transmission fluid (e.g., Roadranger SAE 50). Do not use engine oil. Maintain proper level and service intervals per Eaton guidelines.
Core Exchange Policy
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Sold on exchange: Returned core must be like-for-like, complete, and rebuildable
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Deductions may apply for: Cracked housings, burnt/missing internals, low-lube or water damage, or non-matching cores
Shipping
- Ships via LTL motor freight to verified commercial addresses only
- Forklift or dock required (liftgate available upon request)
- No residential delivery
Warranty
12 months, unlimited mileage against material/workmanship defects (parts only; no labor). Claims subject to inspection. Improper lubrication or installation voids warranty.
Order & Support
Call Discount Parts Exchange - DPX for pricing and availability: 419-522-3320
Curious What a Ratio Change Will Do for Your Truck?
Use our free Road Speed Calculator to plug in your tire size, current ratio, and target speed/RPM. See exactly what a 3.55, 3.73, or 4.10 would do before you buy.
Open Road Speed Calculator →
Reference Documentation
For detailed exploded-view diagrams, part numbers, and component identification, download the official Eaton® Fuller RTLO-18918B Transmission Illustrated Parts List (EN-US version).
📄 Download Eaton Fuller RTLO-18918B Transmission Illustrated Parts List (PDF)
DPX — Ohio’s Premier Heavy-Duty Drivetrain Rebuilder | Built to Perform. Trusted to Last.
