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AVAILABILITY NOTE
We often have more units in stock than what is listed. If you need multiple sensors, send us a message — we can usually supply additional OEM units quickly.
STOCK GUARANTEE
All parts we sell are either:
Brand New, Fresh OEM Stock, or
Factory Remanufactured OEM Parts
We do not sell used or take-offs. Every order ships within 1 business day.
This listing is for a Genuine Eaton Fuller K4148 Transmission Speed Sensor, used across a wide range of Eaton Fuller heavy-duty transmissions. This OEM sensor provides correct signal output, reliable performance, and long service life. If your truck is experiencing intermittent speed readings, cruise control issues, incorrect shifting (auto/manual), or check-engine faults related to vehicle speed input, replacing the K4148 sensor is the OEM-recommended repair.
Small family-owned business
Fast 1-business-day shipping
Fresh, high-quality OEM stock
30-day free returns — seller pays return shipping
Trusted by shops, fleets, and owner-operators nationwide
Fitment support before and after purchase
GENUINE Eaton Fuller OEM speed sensor
Direct, exact replacement — not aftermarket
Ensures proper shifting performance
Accurate speed signal output
Long-life OEM internal components
Required for many Eaton auto-shift & manual transmissions
Ideal for preventative maintenance or troubleshooting speed-signal faults
Part Number: K4148
Brand: Eaton Fuller (OEM)
Cross References: Common reference numbers: K-4148, K4148, K4148- **
Application: Heavy-duty Eaton Fuller transmissions requiring OEM speed sensors
Weight: ~2–3 lb packaged
Function: Provides speed signal to ECM/TCCU for shift strategy, cruise control, and diagnostic monitoring
Construction: OEM electronics and housing — sealed for durability
| Specification | Detail |
|---|---|
| Brand | Eaton Fuller (OEM) |
| Part Number | K4148 |
| Cross Refs | K-4148, K4148- |
| Type | Transmission Speed Sensor |
| Compatible Systems | Eaton Fuller heavy-duty transmissions |
| Condition | New |
| Material | OEM electronic sensor |
| Weight | ~2–3 lb packaged |
| Warranty | Handled directly through Eaton/Fuller dealers |
| Seller Warranty | Seller does not handle warranty claims |
Common applications include:
Eaton Fuller FS-series transmissions
Eaton Fuller RT, RTO, RTOF, RTOX, and RTX series
Eaton automatic & manual heavy-duty transmissions
Used by Kenworth, Peterbilt, Freightliner, International, Mack, Volvo, Western Star as equipped with Eaton Fuller gearboxes
If your truck uses an Eaton Fuller transmission and has external speed input, this K4148 sensor is a common OEM part.
If you're not sure about the part number you need, to better assist you in finding the correct part please provide:
Year
Make
Model
Last 8 digits of VIN
OR
ESN (Engine Serial Number)
We will confirm compatibility quickly and accurately.
Brand new and unused OEM part.
Items may be packed in OEM packaging or repackaged for secure shipping.
Fast shipping — ships within 1 business day
Carefully packaged for protection
30-day free returns — seller pays return shipping
Questions? We respond quickly.
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