Transmission Speed Sensor Replacement 😅🚚
Honestly… when your speedometer starts acting like it’s doing interpretive dance, it’s usually not “just one of those days.” This replacement sensor is designed to restore the shaft speed signal your system expects.
What you’re looking at
This is a Transmission Speed Sensor Replacement for Eaton Fuller Heavy Duty Trucks, intended as a direct factory replacement for OEM part number FULK4149. It’s built for a plug-and-play swap, with the matching mounting bracket and waterproof-style electrical connection.
2-pin orange waterproof plug
Plug-and-play
Heavy duty class 8 compatible (as listed)
Quick reality check: always match your current sensor’s part number and connector style. Even “close enough” can turn into a weekend project you didn’t plan.
Product Explanation
The biggest appeal here is that it’s intended to provide an accurate shaft speed signal for the vehicle speedometer and the transmission control module. When a transmission speed sensor fails, you can see symptoms like a dead/jumpy speedometer, cruise control issues, rough shifting, an illuminated check engine light, and diagnostic trouble codes such as P0501 and P0502.
This replacement is described as using a high-temperature resistant ABS housing, a corrosion-proof steel mounting tab, EPDM rubber waterproof sealing, and a braided anti-abrasion cable sleeve—materials chosen to handle road mud, water splash, vibration, and wide temperature swings.
Key Features
- Direct factory replacement with cross-referenced OE numbers including FULK4149, K4149, K-3938, 3088-K-4149, and S-28764.
- Matches original mounting bracket and is described as requiring no modification for installation.
- 2-pin orange waterproof plug, with the cable length and thread size stated as matching the original.
- Designed to support accurate shaft speed signal output for speedometer and transmission control.
- Weather/vibration resistant construction: ABS housing, corrosion-proof steel mounting tab, EPDM waterproof sealing, and braided anti-abrasion cable sleeve.
- Plug-and-play assembly with integrated bracket for a faster DIY-style swap (no professional tools noted).
Why This Product Exists
This one’s basically for people who are tired of chasing shifting gremlins and guessing games. When a transmission speed sensor goes bad, it can throw off vehicle speed readings and cause related control issues. This replacement is intended to bring the speed signal back to where the system can use it normally.
Best Fit For
This speed sensor replacement is described as fitting Eaton Fuller manual transmissions and being compatible with a range of heavy duty semi trucks, including brands/models such as Kenworth, Peterbilt, Freightliner, Mack, and Navistar International—as well as “most class 8 heavy duty semi trucks,” per the listing details.
It’s also a good match if you’re specifically trying to replace a sensor that uses the FULK4149 part number (and the same style connector/bracket) and you want an installation that’s described as straightforward.
Final Verdict
If your Eaton Fuller setup is dealing with speed signal problems, this FULK4149 transmission speed sensor replacement is a practical option because it’s described as a direct OEM-style swap with matching bracket and waterproof plug. It’s best viewed as a replacement part intended to restore the speed signal—not a “mystery fix.”
For the exact current listing details and availability, hit the button below and double-check the part number match.
Affiliate Disclosure: I may earn a commission if you purchase through the Amazon link(s) in this post.
AI Image Disclaimer: This post does not include images.
AI Content Disclaimer: This content is for informational purposes and is based on the product details provided.
Electrical/Battery Disclaimer: This is an automotive sensor replacement. Follow the vehicle manufacturer’s guidance and safety practices. Disconnect power/negative battery terminal where appropriate before installation.
Tool Safety Disclaimer: Use proper tools and wear appropriate safety gear. If you’re unsure about compatibility or installation, consult a qualified technician.