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Symptoms:

  • Loss of D3 oil
  • Drops out of 4th
  • No 4th
  • Loss of 4th signal oil

Cause:

The hammering affect of the 3-4 relay and/or 3-4 shift valves can cause the soft aluminum end plugs to wear, resulting in loss of 4th signal and/or D3 oil.

Correction:

Replace the worn OE end plugs with the O-ringed Sonnax end plugs to prevent loss of critical 4th signal and/or D3 oil.

4L60-E, 4L65-E, 4L70-E

3-4 Relay O-Ringed End Plug Kit
Part No. 77964-08K

View Instructions

The hammering effect of the 3-4 relay and/or 3-4 shift valves can cause the end plugs to wear, resulting in loss of 4th signal and/or D3 oil. Replace the worn OE end plugs with the O-ringed Sonnax end plugs to restore hydraulic integrity and prevent loss of critical 4th signal and/or D3 oil.

  • O-rings on the end plugs provide a positive seal.
  • Restores hydraulic integrity at the end plug
  • End Plugs (5)
  • O-Rings (5)

January 21, 2013

GM 4L60-E Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission GM 4L60-E Transmission

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  • 77964 08k combo
  • 77964 08k