Exterior Components› Body Panels and Components

Sun Coast Converters

Suncoast Converters 3-4 Relay O-Ringed End Plug Kit 77964-08K

$65.92

SKU: S02K 77964-08K

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INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Suncoast Converters 3-4 Relay O-Ringed End Plug Kit 77964-08K

MIA's Description

The Sun Coast Converters 3-4 Relay O-Ringed End Plug Kit is designed to restore hydraulic integrity in GM 4L60-E, 4L65-E, and 4L70-E transmissions. The kit replaces worn OE end plugs that can cause a loss of 4th signal and/or D3 oil due to the hammering effect of the 3-4 relay and shift valves.

Featuring end plugs with O-rings for a positive seal, this kit helps prevent the loss of critical 4th signal and D3 oil. Each unit includes 5 end plugs and 5 O-rings, with 3 extras of each. The symptoms of worn plugs can include loss of D3 oil, loss of 4th signal oil, no 4th gear, or dropping out of 4th gear.

Fitment

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Specifications

BrandSun Coast Converters
Part NumberS02K 77964-08K

Videos

4L60E Valve body build Sonnax Performance Pack 1of 2

4L60E Valve body build Sonnax Performance Pack 1of 2

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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