BigMike

We redesigned our 4.70:1 gear kit back in 2009 and I never got the new features posted up here, so here goes!!

Exploring the New 4.70:1 XD Technology

Marlin Crawler, the inventor of the 4.70:1 ratio in 1997, unveils their new Xtreme Duty 4.70:1 Low Range Gear Set, further establishing their stronghold on the Toyota transfer case market as the world-leader in strength, reliability, performance, and design.
Twelve years since it's creation, the most successful and longest lasting Toyota low range gear set of all time has been reinvented. Please take a moment to explore the technology of the most feature-rich gear set in the world...



Features
AISI/SAE 8620 Steel Alloy Material
Total-Spline Input Technology
Wider Countershaft Teeth
Oversized Countershaft Shank
Slow Speed Oil Transfer System
Mainshaft Cage Bearing Oil Pump System
Countershaft Cage Bearing Oil Pump System
Tapered Shift Hub Lock System
Increased 63/32N Bearing Oiling
New Lighter-than-stock Design

1. AISI/SAE 8620 Steel Alloy Material
Our previous gear set was cut from 8620 steel alloy, and our new Xtreme Duty gears settle for nothing less. We only use material that is recognized by the American Iron and Steel Institute (AISI) and the Society of Automotive Engineers (ASE). Marlin Crawler means Quality.

• Excellent toughness, hardness, and wear properties far superior to OEM material.

2. Total-Spline Input Technology

Marlin Crawler invented the Total-Spline input back in 2000. Since then, the number of broken inputs and stripped out couplers have been drastically reduced. This same technology is featured in our new Xtreme Duty 4.70:1 Gears.

• The only gear set in the world with Total Splines.
• 65% Longer Splines - By far the longest lasting and the most difficult to strip.
• 15% Larger Diameter - Can handle much higher torque loads without failure.

3. Wider Countershaft Teeth

The weakest spot of the countershaft just became a whole lot stronger. The new Xtreme Duty Gear Set features extra wide teeth to spread the torque load where it matters the most.

• This is the weakest spot of the countershaft.
• 42% Wider Gear - Soaks up torque like a dry sponge.

4. Oversized Countershaft Shank

Just to make sure these Xtreme Duty gears can live up to their Marlin Crawler name, we increased the diameter of the countershaft shank. Marlin Crawler Gears are truly remarkable.

• Improved torque and shock loading.

5. Slow Speed Oil Transfer System

Our new Xtreme Duty gears are the first gears in the world to feature a specifically designed low speed oil transfer system. Think Crawling. Crawling slowly limits the amount of oil available to the mainshaft cage bearing. As the new Xtreme Duty low speed gear slowly rotates, oil is caught and lifted up where it is deposited right into our cage bearing oil pump system (described below).

• World's first low speed gear oil transfer system.
• Prevents oil starvation of mainshaft cage bearing and input pocket bearing while Crawling.

6. Mainshaft Cage Bearing Oil Pump System

This exclusive Marlin Crawler Oil Pump system is a revolutionary way of ensuring the mainshaft cage bearing keeps a maximum amount of gear oil under all driving conditions. Wether freeway driving or 1,372:1 Rock Crawling, it is important to keep all bearings lubricated.

• The only gear set in the world featuring an integrated Low Speed Gear Oil Pump.
• Increases oil to all mainshaft bearings including the 4WD idle gear cage bearing, low speed gear cage bearing, and the input pocket bearing.
• The most efficient gear set on the planet - ideal for mixed trail/highway use.

7. Countershaft Cage Bearing Oil Pump System

This all-new integrated countershaft cage bearing oil pump is truly amazing. When the countershaft gear meshes with the low speed gear, tremendous pressure is created between each tooth, and the surrounding gear oil is squished out of each bottom landing. What we have done is created two tunnels (180° apart) for this gear oil to be transferred straight to the cage bearing where it is needed.

• The only gear set in the world featuring an integrated Countershaft Oil Pump
• Extreme climates demand the Xtreme Duty Gear Set.
• Snow and Mud often prevent airflow around the transfer case - keep oil circulating when the air is not.
• The Xtreme Duty Gear Set is by far the coolest running low range gear set on the planet.

8. Tapered Shift Hub Lock System

Toyota wasn't playing around when they built a tapered shift hub lock on each and every low range gear set ever made: It prevents accidents and can even save lives. Imagine Crawling up a very steep incline. You get higher, and higher up, 30-, 40-, 50-feet and higher. Now imagine your transfer case suddenly pops into neutral! Don't let this happen to you! Other gear manufactures overlook this absolutely critical shifter locking feature and Marlin Crawler refuses to sell dangerous gear sets!

• It's a very serious issue that too many people take for granted. Protect your investment as well as your life.

9. Increased 63/32N Bearing Oiling

The countershaft is supported by two bearings, and we did not forget about the 63/32N ball bearing. The new Xtreme Duty Gear Set features a dished countershaft near the 63/32N bearing yielding a whopping 50-times more open space beneath the bearing. This allows for massive oil circulation around the bearing, which is important when the gears are used behind a restrictive dual case adapter in an Ultimate setup or when the oil is shifted away from the bearing on steep inclines or declines.

• Much faster heat transfer from the bearing to the oil.
• Much faster lubricating recovery when oil is shifted back to the front of the case.
• The first aftermarket gear set that allows for complete through oil cycling from one side of the bearing to the other.

10. New Lighter-than-stock Design

You read that right, the new XD gear set is lighter than the stock low range gear set! Amazingly isn't it? At just 15.1 pounds, we've added technology and removed fat. Less rotational mass improves acceleration while reducing the load on the bearings. The result is a more responsive gear set with longer lasting bearings.

• 8% weight reduction puts XD gear set lighter than stock gears - the lightest gear set on the planet!
• More responsive to RPM change - Less resistance, improved acceleration.

Conclusion
After examining the most feature rich and technologically advanced Toyota RF1A low range gear set in the world, we are certain you will agree that the new Marlin Crawler Xtreme Duty 4.70:1 Gear Set is on a completely different level far, far above all the rest. There simply is no comparing a Marlin Crawler with any other.

Click here to view our 4.70:1 XD gear set product page: http://www.marlincrawler.com/transfe...01-xd-gear-kit