Moroso Automatic Transmission Oil Pan Gasket
Moroso Perm-Align Transmission Oil Pan Gaskets: Race-Proven Sealing for Automatic Transmissions
When it comes to keeping automatic transmission fluid where it belongs, few solutions are as well-engineered as Moroso's lineup of automatic transmission oil pan gaskets. Marketed under the Perm-Align name, these gaskets represent a substantial engineering leap beyond the cork and rubber composite gaskets that have frustrated mechanics and enthusiasts for decades.
Steel-Core Rubber Construction
The secret behind Moroso's transmission pan gaskets is their unique composite construction. Moroso transmission pan gaskets are manufactured from 40 Durometer rubber that is molded over and vulcanized to a rigid steel frame. This vulcanization process creates a permanent molecular bond between the rubber and steel, resulting in a gasket that maintains its shape under the mechanical stress and thermal cycling that automatic transmissions routinely produce.
The extra-strength Moroso transmission pan gaskets will not leak, blow out, or get sucked in like stock or inferior-quality aftermarket gaskets. At a full 3/16 in., the Moroso transmission pan gaskets are guaranteed to outlast cork or rubber composite designs. That 3/16" profile is a critical detail — it provides consistent compression across the entire sealing surface, compensating for minor imperfections that would cause thinner gaskets to fail.
No Sealant Required
One of the most practical advantages of the Perm-Align design is its installation simplicity. They allow for the quick removal and installation of transmission pans, requiring no removal of sealant, making them cleaner and easier to use. For anyone who has ever spent 45 minutes scraping RTV silicone off a transmission pan rail, this is a meaningful benefit. The rigid steel core also keeps the gasket aligned with the bolt holes during installation — no shifting, bunching, or wrestling the pan into place.
Transmission Coverage
Moroso offers Perm-Align gaskets across a broad range of classic and modern GM automatic transmissions. Coverage includes the GM Turbo 350 (TH350), GM Turbo 400 (TH400 / 3L80), 4L60E / 700R4, and 4L80E — transmissions found in everything from vintage muscle cars and hot rods to late-model trucks and performance builds. The gasket is 3/16 in. thick and designed to be used with Moroso's aluminum transmission pans that have a flat, machined surface. This tight integration with Moroso's own aluminum pan lineup means the gasket and pan are engineered as a system, eliminating the guesswork that comes with mixing and matching components.
Built for Performance and Street Use Alike
Designed to be used with performance racing vehicles, the rubber used in the component has been reinforced with a steel core to add durability. That said, the Perm-Align gasket is equally at home on a weekend cruiser or a daily driver — anywhere a leak-free, long-lasting transmission seal is a priority. The rubber/steel gasket outlasts cork composites to provide years of dependable service.
Whether you're performing routine transmission maintenance or building a high-performance drivetrain from the ground up, Moroso's automatic transmission oil pan gaskets deliver the kind of reliability that the brand has built its reputation on. Browse the full selection of automatic transmission oil pan gaskets or explore the complete Moroso catalog for complementary transmission pans and drivetrain accessories.