In 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.

O-Rings on the end plugs provide a positive seal
Restores hydraulic integrity at the end plug

More From This Category

Sonnax Ratcheting End Plug, 096, 097, 098, 01M, 01N, 01P, Each

Sonnax Ratcheting End Plug, 096, 097, 098, 01M, 01N, 01P, Each

$63.28

Sonnax Vacuum Test Plate Kit, Ford, ZF6Hp19/26/32, 6R60/75/80, Each

Sonnax Vacuum Test Plate Kit, Ford, ZF6Hp19/26/32, 6R60/75/80, Each

$743.61

TCI Automatic Transmission Rebuild Kit, Racing, For Chevrolet, Powerglide, Kit

TCI Automatic Transmission Rebuild Kit, Racing, For Chevrolet, Powerglide, Kit

$121.23

Sonnax Zip Kit®, A340E/F ('00-Later V6 & V8), Each

Sonnax Zip Kit®, A340E/F ('00-Later V6 & V8), Each

$345.80

Manley Wrist Pin Bushing, Each

Manley Wrist Pin Bushing, Each

$22.80