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  • Switch codes
  • Low cooler flow
  • Low pump volume
  • Pump noise
  • Pump seal leakage
  • Loss of prime
  • TCC codes


Pump body bores vary in diameter. Standard replacement bushings often result in excessive hub-to-bushing clearance.


This improved fit replacement bushing restores proper hub-to-bushing clearance.

40TE, 40TES, 41AE, 41TE, 41TES, 42LE, 42RE, 42RH, 42RLE, 62TE, A670, A904

Pump Bushing
Part No. 12502-01


Package Quantity: 5

View Instructions

Excessive torque converter hub-to-pump bushing clearance is a root cause of code 38, TCC slip codes, front seal leakage, loss of prime code 35, and pump noise. The OE bushing is machined in place, allowing a wide tolerance on pump housing bore diameters. Bore diameters can vary by more than .003". This wide tolerance is a problem when using standard replacement bushings. Standard replacement bushings will often have .008" or more hub-to-bushing clearance with an average 10 times more oil loss than the Sonnax improved fit bushing. The Sonnax improved fit pump bushing 12502-01 will restore the clearance necessary for proper operation. The Sonnax bushings should be used when the housing diameter is greater than 1.6175", which will be in most cases.

  • Allows precision clearances with wide tolerance pump bushings.
  • Does not require machining to restore correct clearance.
  • Bushing Style: Precision
  • Material: Steel-backed bimetal
  • Width: 0.535"
  • Shaft Dia.: 1.498"
  • Housing Bore: 1.619"

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

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  • 12502 01 combo
  • 12502 01