Replace erratic throttle response and dead pedal problems on your VP44-powered Cummins with the Alliant Power AP63428 Accelerator Pedal Position Sensor Assembly. This direct-fit APPS and bellcrank unit is built to OE specs for 1998.5–2002 Dodge Ram 5.9L Cummins trucks with automatic transmissions, delivering smooth, consistent accelerator input to the ECM.
Direct-fit APPS/bellcrank for 98.5–02 Ram 2500/3500 5.9L Cummins A/T.
Corrects dead pedal, surging, and hanging idle complaints.
Pre-calibrated assembly for quick bolt-on installation.
Designed for VP44-equipped 24V engines with bellcrank linkage.
OE-style connector and mounting for reliable long-term operation.
Backed by Alliant Power warranty and technical support.
Alliant Power’s AP63428 APPS assembly is engineered as a complete throttle position solution for late 2nd-gen Cummins trucks using the VP44 injection pump and automatic transmission. The unit combines the accelerator pedal position sensor and bellcrank linkage, converting pedal movement into an accurate electronic signal for the engine control module. This eliminates common wear and drift issues found in aging factory sensors that lead to inconsistent throttle feel. The assembly reuses factory-style mounting points and connectors, making it an ideal choice for high-mileage work trucks, tow rigs, and daily drivers that need dependable, repeatable throttle control under load.
1998.5–2002 Dodge Ram 2500 5.9L Cummins, automatic transmission only.
1998.5–2002 Dodge Ram 3500 5.9L Cummins, automatic transmission only.
Improved drivability with smoother, more linear throttle response.
Restores proper communication between accelerator pedal and ECM on VP44 systems.
Helps prevent unsafe hesitation when merging, towing, or pulling grades.
Reduces nuisance troubleshooting versus trying to recalibrate a failing OE sensor.
Common signs your AP63428-type APPS is failing include:
Intermittent or complete “dead pedal” (no throttle response).
Surging, jerky acceleration, or random high idle.
Cruise control dropping out unexpectedly.
Check engine light with APPS/TPS-related DTCs such as P0121, P0122, P0123, or similar throttle position circuit codes (may vary by truck).
Alliant Power typically backs AP63428 with a 2 year limited warranty against defects in material and workmanship; term and coverage are determined by Alliant’s current policy and your installer or reseller. Standard shop practice is to require professional installation and to deny coverage for damage from mis-installation, contamination, or wiring modifications.
Q: Will AP63428 fit manual-transmission trucks?
A: No, AP63428 is specified for automatic transmission VP44 trucks only; manual-transmission trucks use a different APPS setup and linkage.
Q: Does this part require calibration after install?
A: The assembly is supplied pre-calibrated to OE spec, but some technicians still verify APPS voltage and idle validation with a scan tool or ECM relearn as good practice.
Q: Is this a genuine Alliant Power part or a universal sensor?
A: AP63428 is an Alliant Power direct-replacement assembly designed specifically for 98.5–02 Dodge 5.9L Cummins with automatic transmissions, including bellcrank and sensor.
Q: Can a bad APPS damage my VP44 pump?
A: While a failing APPS typically causes drivability and safety concerns rather than direct pump damage, inaccurate throttle signals can contribute to poor performance and should be addressed promptly.
This product fits the following vehicle configurations:
| YEARS | VEHICLE MFG | ENGINE MFG | ENGINE | APPLICATION | NOTES | FOOTNOTESE | NGINE SERIAL NUNMBER(S) | OEM CROSS-REFERENCE |
|---|---|---|---|---|---|---|---|---|
| 1998-2003 | Dodge | Cummins | ISB | with VP44 | For use with automatic transmissions. | N/A | 3970084, 53031575AH |
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