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 Sonnax O-ringed end plugs to prevent loss of critical 4th signal and/or D3 oil.
n GM 4L60-E, 4L65-E and 4L70-E units, 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 Sonnax 3-4 relay O-ringed end plug kit 77964-08K to restore hydraulic integrity and prevent loss of critical 4th signal and/or D3 oil.
Symptoms:
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 Sonnax O-ringed end plugs to prevent loss of critical 4th signal and/or D3 oil.
n GM 4L60-E, 4L65-E and 4L70-E units, 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 Sonnax 3-4 relay O-ringed end plug kit 77964-08K to restore hydraulic integrity and prevent loss of critical 4th signal and/or D3 oil.
Note: Each unit requires 2 end plugs and O-rings.
Contents:
SONNAX Installation Instructions