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Sonnax 4L60E Transmission Forward & Reverse Abuse Bore Plug 77754-21

by Sonnax
SKU S74741G-6
Original price $8.40 - Original price $8.40
Original price
$8.40
$8.40 - $8.40
Current price $8.40
Availability:
in stock, ready to be shipped

Delivery time

You will receive your package in 2–5 business days within the contiguous U.S.

Brand: Sonnax

Type: Valve Body Component

Interchange Part Number: S74741G-6

Manufacturer Warranty: Yes

Items Included: Abuse Valve Bore Plug

Manufacturer Part Number: 77754-21

Universal Fitment: Yes

Vintage Part: No

Performance Part: No

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

Forward & Reverse Abuse Bore Plug
Part No. 77754-21

Fits in either of two locations

The bore plug in GM 4L60-E, 4L65-E and 4L70-E units is held loosely in place with a coiled spring pin, allowing the opposing spring and oil pressure forces to stroke it within the bore.

This constant oscillation causes the plug to wear and allows PR oil at the low overrun valve and 3-4 clutch oil at the 3-2 downshift valve to exhaust at the abuse valves. This excessive oil loss can result in delayed apply of the Low/Reverse clutch and a tie-up of the 3-4 clutch and 2-4 band. Sonnax Forward and Reverse abuse bore plug 77754-21 resolves these problems.

This plug is used in two locations in the valve body: to separate the forward abuse and low overrun valves, and to separate the reverse abuse and 3-2 downshift valves.

  • The Sonnax plug has an increased diameter to restore proper valve body clearance in the circuits
  • The plug has a smaller retaining pin hole to reduce plug movement that results in wear
  • No tooling is required for this bore plug

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