Best TH350 Pan Gaskets

We researched and compared the top TH350 pan gaskets based on manufacturer specifications, published industry standards, and aggregated owner feedback. Our evaluation covers materials, sealing performance, and ease of installation to help you choose the right gasket for your transmission.

1. ATP Automotive A-115 Automatic Transmission Pan Gasket: Best Overall

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In our evaluation, the ATP A-115 stands out as the best overall TH350 pan gasket. Its cork-rubber composite material provides a conformable seal that adapts to minor irregularities in the pan or transmission housing. Based on owner feedback and the spec sheets, this gasket consistently delivers leak-free performance when installed with the recommended torque sequence.

However, cork gaskets can shrink or become brittle if exposed to extreme temperature cycles or if stored in dry conditions for long periods. This gasket is best for standard rebuilds or replacements where the pan surface is in good condition. Skip it if you need a reusable gasket for frequent service or if your pan has deep scratches.

• Cork-rubber blend for excellent conformability and oil resistance
• Pre-cut holes align perfectly with TH350 pan bolts
• Includes installation instructions and torque specs

Pros: Reliable leak-free seal when torqued correctly; Affordable and widely available
Cons: Cork can dry out over time if not stored properly

2. Fel-Pro TOS 18798 Oil Pan Gasket Set: Best Reusable

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For those who frequently service their TH350, the Fel-Pro TOS 18798 is the top reusable option. Its steel-reinforced rubber design prevents over-compression and maintains its shape after removal. We compared its material specifications to other reusable gaskets and found it offers superior resistance to tearing and oil absorption.

The main drawback is the price, which is significantly higher than cork alternatives. Also, some users report that the rubber can be stiff in cold weather, requiring careful positioning. This gasket is ideal for DIY enthusiasts who plan multiple pan removals, but skip it if you want a low-cost one-time fix.

• Steel-reinforced rubber construction resists crushing and tearing
• Reusable multiple times if handled carefully
• Includes separate filter adapter gasket for complete seal

Pros: Extremely durable and resistant to oil degradation; Can be reused after cleaning
Cons: Higher cost compared to cork gaskets

3. Dorman 265-981 Automatic Transmission Pan Gasket: Best Budget

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The Dorman 265-981 is our budget pick for TH350 pan gaskets. It is a straightforward cork gasket that meets the basic sealing requirements at a low price point. In our research, owner feedback indicates it works well when installed with care and proper torque.

However, cork gaskets are less forgiving of surface imperfections and can leak if the pan bolts are tightened unevenly. This gasket is suitable for a quick, cost-effective repair on a clean pan. Skip it if you need a high-performance seal for a modified transmission or if you prefer a reusable gasket.

• Direct replacement for TH350 pan gasket
• Low-cost option for basic repairs
• Includes correct bolt hole alignment

Pros: Very affordable; Simple installation with no special tools
Cons: Cork may leak if over-torqued

4. Mahle Original 31033 Automatic Transmission Pan Gasket: Best Premium

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The Mahle Original 31033 is a premium gasket designed for demanding applications. Its nitrile rubber compound offers superior resistance to transmission fluid and high temperatures, making it a favorite among performance enthusiasts. We evaluated its material data sheet and found it exceeds OEM specifications for durability.

The main downside is the cost, which can be several times that of a cork gasket. Additionally, some users note that the steel carrier can be slightly rigid, requiring careful alignment to avoid leaks. This gasket is best for high-mileage vehicles or those used in towing or racing. Skip it if you are on a tight budget or need a gasket for a simple fluid change.

• Nitrile rubber material resists transmission fluid and heat
• Steel carrier prevents gasket from shifting during installation
• Precision-molded for exact fit

Pros: Excellent resistance to fluid and temperature extremes; Steel carrier makes alignment easy
Cons: Higher price than many competitors

5. TransGo SK4T350 Shift Kit and Gasket Combo: Best Shift Kit Combo

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The TransGo SK4T350 is a combination shift kit and pan gasket set aimed at improving TH350 shift performance. In our evaluation, the included cork gasket meets basic requirements but is not the standout feature. The shift kit itself is well-regarded for firmer shifts and better clutch life.

However, the gasket is a standard cork type that may not provide the same longevity as dedicated premium gaskets. Also, installation of the shift kit requires mechanical experience. This product is best for those already planning a shift kit upgrade and want a gasket included. Skip it if you only need a gasket replacement and do not want to modify shift characteristics.

• Includes a pan gasket plus shift kit components
• Designed to improve shift firmness and response
• Cork gasket is suitable for standard applications

Pros: All-in-one solution for performance upgrade; Enhances transmission shift quality
Cons: Gasket quality is average; may not suit all needs

6. ACDelco 24204010 GM Original Equipment Transmission Pan Gasket: Best OEM

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The ACDelco 24204010 is the genuine GM original equipment gasket for TH350 transmissions. In our research, it offers a precise fit and consistent cork thickness that meets OEM standards. Owner feedback indicates reliable sealing when installed properly.

However, it is a cork gasket sold at a premium price, often costing more than aftermarket alternatives with similar performance. It also shares the typical cork limitations: potential for shrinkage and sensitivity to over-torquing. This gasket is ideal for restorations or those who insist on OEM parts. Skip it if you want better value or a reusable gasket.

• Genuine GM part for exact fit
• Cork material with consistent thickness
• Includes installation instructions

Pros: Exact OEM fit and quality; Trusted brand with quality control
Cons: Premium price for a cork gasket

7. Mr. Gasket 5875G Automatic Transmission Pan Gasket: Best for Racing

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The Mr. Gasket 5875G is marketed for racing and high-performance use. Its cork-rubber blend includes additives to resist higher temperatures, which we confirmed from the manufacturer’s technical data. Owner feedback from racing forums notes it holds up well under track conditions.

However, it is still a single-use gasket and can be prone to leaks if the pan or transmission surface is not perfectly clean. Also, its price is higher than standard cork gaskets without offering reusability. This gasket is best for occasional racing or high-heat street use. Skip it if you need a gasket for daily driving or frequent service.

• Cork-rubber blend with high-temperature additives
• Designed for high-performance and racing applications
• Fits TH350 and TH400 pans

Pros: Resists high transmission temperatures; Good conformability to uneven surfaces
Cons: Not reusable; single-use only

Frequently Asked Questions

What is the best material for a TH350 pan gasket?

The best material depends on your needs. Cork-rubber composites offer good conformability and are affordable, while rubber with steel cores provide reusability and durability. For high-heat applications, nitrile rubber is recommended. We found that cork is suitable for standard rebuilds, but reusable rubber gaskets are better for frequent service.

Can I reuse a TH350 pan gasket?

Only gaskets specifically designed for reuse, such as the Fel-Pro TOS 18798 with a steel-reinforced rubber core, can be reused. Most cork and cork-rubber gaskets are single-use because they compress and conform to the surfaces. Attempting to reuse them often leads to leaks.

How do I prevent a TH350 pan gasket from leaking?

Ensure the pan and transmission housing surfaces are clean and flat. Use the correct torque sequence and torque specification (typically 10-12 ft-lb for TH350). Avoid over-torquing, which can distort the pan and cause leaks. Some gaskets require a thin layer of sealant, but many are designed to be used dry. Always follow the manufacturer’s instructions.

Do I need to use sealant with a TH350 pan gasket?

Most modern gaskets, especially rubber or composite types, are designed to seal without additional sealant. However, some cork gaskets may benefit from a thin coat of sealant on the pan side to prevent wicking. Check the gasket’s instructions. In our research, using sealant is not necessary for most quality gaskets and can sometimes cause leaks if over-applied.

Will a TH350 pan gasket fit other transmissions?

Some TH350 pan gaskets also fit TH400 and 700R4 transmissions due to similar pan shapes, but it is not universal. Always verify the part number compatibility. For example, the ATP A-115 fits TH350, TH400, and 700R4, while the ACDelco 24204010 is specific to TH350. Check the product specifications before purchase.

Our Verdict

After researching and comparing the top TH350 pan gaskets, we recommend the ATP Automotive A-115 as the best overall for its reliable cork-rubber seal and value. For those seeking a reusable option, the Fel-Pro TOS 18798 is our runner-up, offering excellent durability for frequent service.

Video Guide

Video: Related tutorial from YouTube