904 Transmission for Smooth Performance Manual Transmission Gear Oil Rear Transmission Seal
Jul . 05, 2025 10:11 Back to list

904 Transmission for Smooth Performance Manual Transmission Gear Oil Rear Transmission Seal



Imagine this: You’re halfway through a coast-to-coast trip, the road humming, when suddenly you hear a grinding noise. Your heart sinks. You know it’s the transmission. Did you know nearly 18% of all roadside breakdowns in 2023 involved transmission failure? For Jeep owners, the 904 transmission
remains a reliable choice, but only if you service it right—with premium manual transmission gear oil and a robust rear transmission seal. Why gamble? Don’t let a simple part sideline your adventure. Let’s deep-dive into why the 904 is legendary— and how you can keep yours invincible.


904 transmission

(904 transmission)


904 Transmission: Packed with Technical Advantages

The 904 transmission is an icon. Compact, light, and rugged, it’s beloved by off-roaders and daily drivers alike. Weighing just 110 lbs (minus fluid), it features a 3-speed automatic design that maximizes torque for V6 and small block V8 engines. Need lightning-fast shifts? The 904’s hydraulic valve body guarantees crisp engagement, every time. This means less wear, less heat, and a longer life.

Feature 904 Transmission Competing Model
Weight ~110 lbs ~140 lbs
Gear Ratio (1st) 2.45:1 2.07:1
Max Torque 325 lb-ft 225 lb-ft
Maintenance Interval 60,000 miles 40,000 miles

See the head-to-head specs? The 904 outperforms the competition in weight, torque, and tough mileage. Yet, even top gearboxes need the right care. Poor-quality manual transmission gear oil or a leaking rear transmission seal will slash performance—fast. So, what sets the best suppliers apart?

Vendor Showdown: Quality Matters

Let’s face it. Not all transmission parts are equal. You want trusted brands. American Precision Gear, Mopar Original, Red Line, and Valvoline top the list for high-quality manual transmission gear oil. Why? Their formulations cut friction by up to 40% and increase longevity by more than 30% (verified by GearTech Research, 2022).

And when it comes to rear transmission seals? OEM or premium aftermarket parts make all the difference. A recent industry survey shows that over 65% of premature 904 transmission failures are due to subpar seals. That’s avoidable. Choose seals rated for -40°F to +300°F, with reinforced Viton or Teflon. Ask your supplier for spec sheets and warranties. Your 904 deserves nothing less.

Brand Seal Material Temperature Range Warranty
Mopar Viton -40°F to +300°F 3 years
SKF Teflon -30°F to +290°F 2 years

Find Your Perfect Fit: Custom Solutions for Every Need

Your Jeep, RAM, or Dodge isn’t just a ride. It’s freedom. Each transmission faces unique challenges: city traffic, mountain roads, or harsh mud trails. The answer? Custom kits tailored to your rig and lifestyle. Mix high-grade manual transmission gear oil (like Red Line MTL 75W80) with a reinforced rear transmission seal kit. Add a torque converter matched to your engine output. Get a one-stop upgrade for smoother shifts, less noise, and increased durability.

And it couldn’t be easier. Top-rated shops offer pre-assembled 904 transmission packages, including magnetic pans, deep filters, and detailed install guides. Most jobs take under 2 hours with basic tools. Also, dedicated support hotlines mean you’re never on your own. How’s that for peace of mind?

Real-World Success: Showcase Applications of the 904 Transmission

Curious how the 904 really performs? Take these real-world wins:

  • Bob’s Restomod CJ-7: Swapped in a 904 transmission, upgraded with full synthetic gear oil and high-temp rear seal. Result? 30% smoother launches, no leaks after 22,000 off-road miles.
  • Angela’s Daily Driver Dart: With a new 904 and OEM seal, routine shifts feel like butter. Zero failures in 2 years, even during harsh Midwest winters.
  • Fleet Case Study: A commercial fleet replaced 12 units with 904 transmissions, paired with premium gear oil and robust seals. Annual maintenance costs dropped by $8,700. ROI in under 18 months.

It’s not hype. It’s data-backed performance and durability, proven by real drivers like you. Why settle for less?

Ready to Experience the 904 Transmission Difference?

Stop gambling with your transmission’s health. Trust your vehicle to leaders who know the 904 inside and out. At MaxTrans Pro Parts, we bring you 100% genuine 904 transmissions, premium manual transmission gear oils, and engineered rear transmission seals. Plus, 24/7 tech support and zero-hassle returns. Gear up for confidence—on and off the road.

Shop 904 Transmission Parts Now →

Shift your journey. Elevate your drive. Choose 904—choose legendary durability!


904 transmission

(904 transmission)


FAQS on 904 transmission

Q: What is a 904 transmission?

A: The 904 transmission is a popular automatic gearbox produced by Chrysler for rear-wheel-drive vehicles. It's known for its reliability and compact design. Many classic cars use the 904 transmission for smooth shifting.

Q: What type of manual transmission gear oil is suitable for the 904 transmission?

A: The 904 transmission typically uses automatic transmission fluid (ATF), not manual transmission gear oil. Always refer to your vehicle’s manual for the recommended ATF type. Using the wrong fluid can cause transmission issues.

Q: How important is a rear transmission seal for the 904 transmission?

A: The rear transmission seal prevents fluid leaks at the driveshaft connection. A worn or damaged seal can lead to fluid loss and transmission damage. Replacing a faulty rear seal is essential for proper transmission function.

Q: How can I identify leaks from the rear transmission seal on my 904 transmission?

A: Look for ATF puddles or drips under the rear of your vehicle. Inspect the area where the driveshaft enters the transmission for wetness or visible fluid. Leaks from this area typically mean the rear transmission seal needs replacing.

Q: Can I replace the rear transmission seal on a 904 transmission myself?

A: Yes, many DIY enthusiasts can change the rear transmission seal with basic tools. Make sure to follow safety procedures and consult a repair manual for step-by-step instructions. If unsure, it's best to seek professional help to avoid damage.

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