551915 Dipstick Tube Plug Seal For GM TH350 TH400 700R4 4L60E 4L80E 0.6”1 PC

Dipstick Tube Plug Seal for GM

This 0.6-inch dipstick tube plug seal for GM transmissions prevents transmission fluid from leaking at the case entry, cross-referencing with part number 551915.

Overview

This dipstick tube plug seal for GM is an essential rubber seal designed to stop transmission fluid leaks. This dipstick tube plug seal fits tightly into the transmission case hole to lock out moisture and dirt. Professional transmission builders and DIY mechanics use this dipstick tube plug seal to ensure a leak-free repair during fluid service.

Built For Performance

• High-grade elastomer material designed to resist transmission fluids and heat
• 0.6-inch outer diameter engineered for a tight, leak-free case fit
• Ribbed sealing surface to provide multiple barriers against fluid leakage
• Single-piece construction for easy push-in installation

Fits These Machines

• for GM TH350 Transmissions
• for GM TH400 Transmissions
• for GM 700R4 Transmissions
• for GM 4L60E Transmissions
• for GM 4L80E Transmissions

On-The-Job Use

• Replacing hardened or cracked dipstick seals during transmission oil changes
• Preventing fluid drips on hot exhaust pipes to avoid smoke and fire hazards
• Sealing the transmission case during custom hot rod drivetrain builds

Specs At A Glance

Good To Know

Q: Can this seal be installed without removing the transmission? A: Yes, you can install it by pulling the dipstick tube out, replacing the seal in the case, and reinserting the tube.

Q: What causes the original dipstick seal to leak? A: Heat cycles and age cause the original rubber seal to shrink, harden, and crack, leading to fluid bypass.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.