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Symptoms:

Cause:

The only way to check for leaks is while the drum is in the case

Correction:

This drum test tool allows bench checking for drum leaks without having to disassemble and reassemble the transmission for leak testing.

G4A-EL

3-4 Drum Test Kit
Part No. 71828-TL

View Instructions

It is often both difficult and time consuming to accurately air check for internal 3-4 drum leakage in vehicles with F4A-EL or G4A-EL transmissions. If the drum leaks, the proper amount of fluid pressure is not applying the clutch piston, resulting in burned clutches, slips or no 2-3 shifts. Currently the only way to air check this drum is while it is in the case. This leakage can often be the result of a poor or cracked weld at the back of the 3-4 drum or worn seals. The weld and seals assist in separating the apply pressure fluid passage from the lubrication circuit. Thus if the weld and seals are not sound, cross-leakage occurs. Sonnax offers a drum test tool for both the F4A-EL and G4A-EL transmissions that will aid in quickly determining if the 3-4 drum leaks.

  • These tools, 71828-TL for the G4A-EL and 74828-TL for the F4A-EL, allow the drums to be checked at the bench, without the need to continually disassemble and reassemble the transmission for testing.
  • These test tools allow air pressure to be forced into the clutch apply circuit to test for leakage.
  • Both tools are made from high-quality aluminum and equipped with O-rings to separate the oil circuits.
  • Test Tool
  • Cap
  • Screw
  • O-Rings (2)
  • 71828 tl combo
  • 71828 tl