If your goal is crisper shifts and reliable air flow from the shift knob to the transmission, these shifter air line extension kits are worth considering. The top picks below are designed for Eaton Fuller 13, 15, and 18-speed transmissions and help restore or improve shifting performance. They’re best for fleet maintenance managers, mechanics performing preventive maintenance, and drivers seeking smoother, more reliable gear changes. This guide highlights five options, with quick comparisons to help you choose.
| Product | Best For | Why It Stands Out | Limitations |
|---|---|---|---|
| Talspity Air Line Kit | Maintenance pros, shift knob replacements | 4-color TPU lines, secure fittings, 13 ft length | DIY installation; compatible mainly with Eaton Fuller 13/15/18 |
| Foruly Air Line Kit | High air volume needs, preventive maintenance | 4-color lines, new fittings, faster shifting potential | Knob-to-valve kit; check compatibility for older setups |
| WOTUPHJI Air Line Kit | Direct replacements, long service life | 4-color TPU lines, push-in fittings, leak-free | Brass fittings may require careful seating |
| Auxazalux Shift Knobs Air Line Kit | Plug-and-play upgrades | 4 pieces 12 ft lines, 3×90° and 5x straight fittings | Longer hoses may need manual trimming for fit |
| Dazakoot 15FT Air Brake Line Kit | Extended length needs | 13-15 ft design with spring joint, color-coded | Brake-line style; ensure use is appropriate for non-brake systems |
The following sections dive into each selected product. For clarity, sections use buyer-oriented language like best for, better for, and choose this if to help you compare quickly.
Talspity Air Line Kit For Eaton Fuller
Best for: Maintenance environments where a reliable, multi-color line set helps differentiate airflow paths. The Talspity kit uses 13 ft of TPU lines in four colors and includes nine push-in brass fittings. It fits Eaton Fuller 13, 15, and 18-speed transmissions, making it a solid choice for shift knob replacements or preventive maintenance. The kit’s design aims to prevent leaks and preserve maximum air volume to the shift valve. Caution: ensure the fittings seat properly to avoid micro-leaks in high-vibration conditions.
Foruly 13/15/18 Eaton Fuller Air Line Kit
Best for: Upgrading air flow with a new set of lines and fittings to support faster, more reliable shifts. This kit includes four 12″ lines, nine push-in fittings, and four color-coded lines. It emphasizes increased air volume to the shift valve, which can reduce wear on synchronizers and improve gear changes. Consider this if you need a complete rework from shift knob to transmission. Caution: verify that the included fittings match your truck’s specific push-in sizes before installation.
WOTUPHJI Air Line Kit 13/15/18 Speed
Best for: Replacement of aging air lines with a durable TPU set. The 13-foot, four-color line kit uses brass push-in fittings for a secure, leak-free connection that preserves full line diameter. It’s designed to restore factory-like shifting performance and prevent flow restrictions. Choose this if you want a straightforward, reliable upgrade. Caution: ensure the color-coding aligns with your existing system to avoid routing confusion during assembly.
Auxazalux Shift Knobs Air Line Kit
Best for: Do-it-yourself upgrades that emphasize plug-and-play functionality. This kit includes four 12-foot lines, three 90-degree fittings, and five straight fittings. The lines are described as high-pressure-resistant PU lines that can be cut to length, offering flexibility for fitment. Caution: ensure you press the connection points correctly to release or install without damaging the fittings, especially when working in tight engine compartments.
Dazakoot 15FT Air Brake Line Kit
Best for: Vehicles needing extended air line length with robust protection. Although marketed as an air brake line kit, its 15 ft length and color-coded design provide a longer extension path that can suit certain shifter line routing needs. It features a dual-braided design for flexibility and twist resistance and is built to meet several standard specifications. Caution: confirm that the kit’s components are suitable for non-brake, transmission-shift line use in your setup to avoid misapplication.
Buying Guide: Shifter Air Line Extensions
Key considerations help you select the right kit for your Eaton Fuller transmission and operation style.
- Compatibility: Confirm the transmission model (13/15/18 speed) and gear-shift system you maintain or upgrade.
- Line material and flexibility: TPU lines offer durability and elasticity; PU lines provide flexible routing with high resistance to wear.
- Color-coding and fittings: Four-color lines and brass push-in fittings aid installation and leak resistance.
- Length: Choose between 12 ft, 13 ft, or 15 ft based on your routing path and space constraints under the cab.
- Installation approach: Push-in fittings support quick, secure connections without over-tightening, preserving line diameter.
- Maintenance impact: Upgraded lines can reduce shifting delays and synchronizer wear, especially after shift knob replacements or system overhauls.
What should I consider before buying?
- System condition: If lines are aged or damaged, a complete replacement with a high-quality kit is often more effective than patching.
- Installation environment: Consider heat exposure, abrasion risk, and vibration when choosing line material and length.
- Future upgrades: If you plan additional modifications, choose a kit that fits easily with future components and avoids rework.
How do I install these kits?
Most kits use push-in brass fittings and color-coded lines. To install, cut lines to required length, clean fittings, push lines into fittings until seated, and verify the inner diameter remains unobstructed. After installation, test for leaks with the engine off and air system pressurized at a safe level.
Quick comparison at a glance
- Best overall for Eaton Fuller 13/15/18: Talspity
- Best for air volume and faster shifts: Foruly
- Best for plug-and-play simplicity: Auxazalux
- Best extended length: Dazakoot
- Best balance of cost and durability: WOTUPHJI
FAQ
- Q: Are these kits universal for all Eaton Fuller models? A: They target 13, 15, and 18-speed Fuller transmissions; confirm your exact model before purchasing.
- Q: Do these kits include necessary tools for installation? A: They include lines and fittings; you may need common hand tools to trim lines and secure fittings.
- Q: Will upgrading lines improve shifting speed? A: Higher air volume and proper sealing can reduce lag and gear-change wear, leading to crisper shifts.
- Q: Can I install these myself? A: Yes, many buyers perform installation with basic mechanical tools, following kit instructions and safety precautions.
- Q: Do these kits come with warranties? A: Warranties vary by seller; review product pages for details before purchasing.
- Q: Should I replace all lines or just worn ones? A: If several lines show wear or aging, replacing the full kit is often more reliable than selective replacements.