Building The Ultimate Dana 300 - Transfer Case Beef

Increase the strength of your T-case

Harry WagnerPhotographer, Writer

The Dana 300 is arguably the best factory transfer case offered in a 4-wheel drive. Yes, an NP205 is stronger and is available in either left- or right-hand drop, but it is also heavier and larger and only offers a 1.96:1 low range. Like the NP205, the Dana 300 uses a cast iron case and helical-cut gears, but boasts a 2.62:1 low range from the factory and was available only with a passenger front output.

“The company that makes the mightiest aftermarket transfer case can also make your Dana 300 better”

As great as it is, these is still room for improvement with the Dana 300. It makes sense that the company that makes the mightiest of aftermarket transfer cases can also make your Dana 300 even better. That’s right, Advance Adapters, the people who brought you the Atlas II, have everything you need to make your Dana 300 live behind big power and turn even the largest of tires on the trail.

We did one-stop shopping with Advance Adapters to make our Dana 300 stronger and more functional. These upgrades included 4:1 low range gears for more torque multiplication on the trail and a heavy-duty (NP205 sized) 13⁄8-inch, 32-spline output shaft to replace the factory 11⁄8-inch, 26-spline output. We also added the Advance Adapters twin stick kit, which includes rod ends for all linkages and new shift rails that allow front wheel drive in low range. “Front digging” with the rear output disconnected can be extremely useful on tight technical trails, which is exactly where we plan to head after stabbing this Dana 300 back in to our latest project vehicle.

Dana 300 Specs
Case: Nodular cast iron
Internals: Helical-cut gears
Input: 23-spline (female)
Outputs: 26-spline
Gear Ratio: 2.62:1
Bolt Pattern: Round 6-bolt (most common)
Weight (lb): 85
Length (in): 11 1⁄2
Width (in): 16
Found In: ’80-’86 Jeep CJs, ’80 International Scouts (Texas pattern)

When Should You Consider an Advance Adapters Atlas?
As good as the Dana 300 is, we put $1,400 worth of parts into making our transfer case as strong as possible. Of course, you don’t have to perform all of the upgrades at the same time; you can pull out your transfer case and upgrade components as your budget allows. We performed the labor ourselves and already had a Dana 300 to start with, but if you needed to pay labor and didn’t have a core, you could easily get into an Advance Adapters Atlas transfer case territory. Two-speed Atlas II cases start around $2,400 and offer strength that surpasses even our beefed Dana 300.