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Ring, A55 Sun Gear

Ring, A55 Sun Gear — Part # 12178A
Part # 12178A
Type:
Clutch, drum, gear, ring
Transmissions:
30RH, 32RH, 40RH, 42RE, 42RH, 44RE, A998
Data as of:
2026-10-17

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Cross-reference numbers

NumberSystemStatus
1323593OEM✓✓ confirmed by 2 sources
12178AWIT✓ catalog
35749-22010OEM✓ catalog
2823KPrecision? unverified
71002518TransTec? unverified
B20012TransTec? unverified

Where it fits

DiagramPositionTransmission page
30RH178—
42RE17842RE
Other parts in 30RH position 178:
  • 12178B Ring, A904/A500 Rear Clutch Drum (Forward) (1.560”OD) (Metal) 1978-Up
  • 12178BT Ring, A904/A500 Rear Clutch Drum (Forward)(1.560”OD)(Teflon) 1978-Up
Other parts in 42RE position 178:
  • 12178B Ring, A904/A500 Rear Clutch Drum (Forward) (1.560”OD) (Metal) 1978-Up
  • 12178BT Ring, A904/A500 Rear Clutch Drum (Forward)(1.560”OD)(Teflon) 1978-Up
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