Atlas 4 Speed Transfer Case, by Advance Adapters Inc.

Atlas 4 Speed Transfer Case

Advance Adapters has built upon the proven design of the Atlas 2, to create the revolutionary Atlas 4sp. No other transfer case on the market today has 3 separate low range ratios built into a single unit. This transfer case was designed for the off road enthusiast that likes to tackle a large variety of terrain with one vehicle. Selecting one low range ratio that works well for mud, sand and rock crawling, is a compromise but the Atlas 4sp overcomes this limitation. One transfer case that is perfectly suited to any terrain that you may want to conquer.

The Atlas 4sp is offered with two different low range ratio sets. The first configuration has low ranges of 2.0:1, 2.72:1, and 5.44:1. The second configuration has low ranges of 2.72:1, 3.8:1 and 10.3:1. The Atlas is available for both left and right hand vehicle applications with centered rear differentials. The solid, one-piece case design is manufactured from 356-T6 heat-treated aluminum alloy. This material is also used for the structural access cover and all other exterior components. The massive gears are helical cut and synchro-equipped for quiet performance and "shift-on-the-fly" capability. These gears are supported by needle bearing elements, precision matched to strong alloy steel shafts. The ruggedly designed output shafts are amply supported by large tapered roller bearing sets. The Atlas 4sp also features a unique triple stick design to deliver crisp, quiet operation.

Since every Atlas transfer case is custom built to order, the unit will be customized to your vehicle. Please browse this site or give us a call to determine how to configure the ultimate transfer case, and have us build you one for your vehicle.

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CASE:
Material: 356-T6 Heat Treated Aluminum
Weight: 125 lbs. (dry)

INTERNAL COMPONENTS:
Gears: Helical Cut
Planetary Gears: 6 Gears Helical Cut
Bearings: Needle & Taper Rollers
Synchronizers: Borg Warner
Available Input Shaft Splines: 21, 23, 27, 29, 31, 32, 34
Tail Shaft H.D., 32 Spline,
Front Output 32 Spline

RATIOS:
Low Range: (2.0:1, 2.72:1, & 5.44:1) or (2.72:1, 3.8:1, & 10.34:1)
High Range 1:1

LUBRICATION:
Quarts: 2.5
Liters: 2.36

We are currently shipping Amsoil GL4 with all new Atlas units, this along with the other lubricants that are printed in our Atlas Installation Guide are the recommended fluids for the Atlas.

LENGTH COMPARISON:
*Atlas Short tail 15" NP 231, 20.5"
*Atlas Long tail 17" NP241 Rock Trac T/C, 15-1/4" Dana 300, 12"