Transmission Front Sun Gear for Dodge Ram A518 A618 46RH 46RE 47RH 47RE Not 48RE

Front Sun Gear for Dodge A518 / A618 Transmissions (1990-2002)

New replacement front sun gear for the Dodge A518 (46RH, 46RE) and A618 (47RH, 47RE) four-speed automatic transmissions. The sun gear is the central gear of the planetary assembly — when its teeth chip, wear, or overheat, the entire gearset suffers. Replace it during your rebuild and eliminate a common source of noise and repeat failure.

Replaces OEM Part Number

• Cross-references Mopar 2801311
• Thin-shell, no-groove design (1990-2002 style)

Symptoms of a Worn or Damaged Sun Gear

• Gear whine or grinding noise in forward gears or reverse
• Delayed or harsh engagement
• Metal shavings or debris in the pan and filter
• Bluing or heat discoloration on gear teeth found during teardown
• Repeat planetary failure after a previous rebuild

Vehicle Fitment

Does NOT Fit: 48RE transmissions (2003 and later diesel trucks). The 48RE uses a thicker sun shell with wider groove spacing and a different matching sun gear. This gear will not work with the 48RE-style thick sun shell. Verify your transmission model and sun shell style before ordering.

Installation Notes

• Transmission disassembly required — professional installation recommended
• Inspect the sun shell, planetary carriers, and thrust washers during replacement
• Never reuse a gear showing heat discoloration or tooth damage

Complete the Job: Add Lubegard Platinum ATF Protectant to your fluid fill after the rebuild — it helps reduce heat and friction so your fresh transmission stays that way.