Description
Fits 1979-1995 4cyl RF1A Gear Drive Transfer case only. Does not include any gaskets or seals. Gasket & seals available HERE.
Our XD Gears now feature a Total-Spline input oil pump that maintains constant
oiling for the Pocket Bearing and Dual Case Coupler! (depending on application)
Another industry first from the original 4.70:1 inventor, Marlin Crawler!As the inventor of the 4.70:1 Gear Ratio for use in Toyota transfer case products with 24-years experience with custom low range gear set manufacturing, our 4.70:1 XD gear set is packed with far more features than any other and is in a league all by itself. Take your truck to an unmatched new level of off-road confidence, performance, and reliability today!
The Marlin Crawler 4.70:1 XD gear kit will replace your truck's stock 2.28:1 low range ratio with our 4.70:1 ratio, giving you a 106% lower final drive ratio for manual applications, or when combined with a torque converter, an equivalent low range ratio of 9.4 to 11.75:1 based on ATF temperature for automatic applications. For a typical application with stock 4.11:1 ring and pinions, our low range gear set will take the stock 37:1 final drive to a new 76:1 final drive providing 2.1 times more control, 2.1 times more torque, 2.1 times less bouncing, and 2.1 times less drivetrain load.
Your truck will become easier to control, have a much greater ability to maintain traction, and will save critical components such as your clutch (if manual transmission) and your brakes (if automatic transmission). Additionally, your torque output will increase by more than double, which means you won't have to rev your engine to get power. You'll be able to go slower, control your vehicle, prevent bouncing and jerking, which will result in a safer trail ride with less risk of breaking parts.
Each Gear Kit includes the following:
- Total-Spline XD Input Gear, XD Countershaft Gear, and XD Low Speed Gear
- Japanese-made
OEM Input and Countershaft bearings, preinstalled
- Note: You must transfer all four of your original front snap rings during installation
- Complete Gasket Seal Kit , including...
- Oil pump seal
- Speedometer sender o-ring
- EcoSeal HD transmission output seal ($12.99 value)
- EcoSeal HD transfer case output seal ($9.99 value)
- Marlin Crawler Delrin Turtle Shift Knob ($15 value)
It has always been Marlin's philosophy that if you've got your t/case removed then you should also replace your transmission output seal while it is readily accessible, and for this reason we have always included a new transmission output seal since 1996!
Application: Any 1979-95 gear drive 4-cylinder transfer case.
Exploring the New 4.70:1 XD Technology
Marlin Crawler, the inventor of the 4.70:1 ratio in 1995, 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
- NEW: Input Pocket 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 design in July of 1995 and began producing them in 1999. 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.
- NEW! Now features the same oil pump as our countershaft! (see #8 below)
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. NEW: Input Pocket Bearing Oil Pump System
This is our new integrated input pocket bearing oil pump! Similar to the oil pump of our countershaft, as the input meshes with the countershaft, 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 pocket bearing of the input where it is needed.
This is specifically important for customers running Bobby Long (Longfield) output shafts that lack the important factory oil pump, as well as those who have a Chain Drive t/case positioned behind the 4.70:1 gear set. This means all 1988 and newer 6cyl and 1995 and newer 4cyl customers.
- The pocket bearing is the smallest bearing in the t/case or Crawl Box and we have the only solution to keep it properly oiled
- The only gear set in the world featuring an integrated Input 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.
9. 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.
10. 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.
11. 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. 