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Atlas 31, 28, 34, 25 spline input (Ford)

FORD 31 SPLINE:

The 31 spline Atlas was designed to fit the 4WD Full Size Ford transmissions. The stock transmissions used in these vehicles were normally coupled to either a NP205, NP208 or Borg Warner 1356. The bolt pattern on these transmission tailhousing adapters is identical to a stock Jeep. Ford used various output shaft stickout lengths. Caution should be used in order to avoid the spline portion of the shaft from "bottoming out" in the Atlas input shaft. Some applications that have an output shaft stickout past the tailhousing will require a 1" spacer adapter, P/N AS-0404. Late model full size Fords with the Borg Warner 4406 transfer case and the vacuum activated electric lock front axle will require a low range switch on the Atlas shift housing and some electrical work for the front axle.

Ford ZF 5 speeds work fine and are equiped with a 31 spline output; however, the 6 speed ZF diesel will not since Ford used a 24 spline on this transmission.

Ford 6R80 and 10R80, we make a new adapter to fit these transmissions to the Atlas. This combination does require a shorter 31 spline input on the Atlas whick is

P/N A31S

31 Spline Input For: Part Number: Transmission Shaft Stick out Length:

Atlas 2 Left & Right Drop:A31 .325

Atlas 4 Left & Right Drop: A431 .500

Stick out length is the length that the shaft protrudes from the rear of the transmission with the adapter installed. The measurement is the length that the Atlas will accept.

FORD 28 SPLINE:

The 28 spline Atlas was designed to fit only the 1966-77 Broncos. The stock transmissions used in these vehicles were normally coupled to a Dana 20 transfer case. The bolt pattern on the face of the Dana 20 is a 6-bolt hex pattern, which we mirror on the Atlas transfer case. The rotation options of the Atlas into these vehicles are 42 degrees (which is stock), 35 degrees (for additional ground clearance), and 28 degrees (requires some internal frame modifications). NOTE: When bolting the Atlas up to an automatic C4 transmission, we offer a shorter Atlas input shaft to avoid spline run-out. When using a NP435 or T18 transmission (with one of our adapter housings), the threaded portion of the transmission output shaft must be removed.

The Atlas 2 speed is the only unit available for these transmissions: (A body lift is recommended)

Left Side Front Driveshaft Atlas 2 Speed: P/N A28

Atlas 4 Speed can be used with a C4 transmission. The C4 must be equiped with a new kit PN50-8100. This is the adapter that is used for the Jeeps and comes with a new 23 spline output shaft. The adapter is 6.25" long and would require a new crossmember to be used. The Atlas 4 Speed would be an A423.

FORD 34 SPLINE:

The 34 spline Atlas was designed to fit the 2004 & newer 5R110 (Torqueshift) transmission. This 4WD transmission has the speed sensor in the transmission tailhousing; so when ordering the Atlas tailhousing, a speedometer hole plug is required. The 2003-2009 5R110 torqueshift is a 5 speed automatic that was used in the E250-350 and F250-450 6.0 & 6.4 Diesels. The gear ratios are 3.09, 2.20, 1.538, 1.096, 1.00, .712 & R2.88. To install an Atlas using the stock 4WD tailhousing, you will be required to use a 1" spacer, PNAS-0402.

34 Spline Input For: Part Number: Transmission Shaft Stick out Length:

Atlas 2 Left & Right Drop: A34 .325"

Atlas 4 Left & Right Drop: A434 .250"

Stick out length is the length that the shaft protrudes from the rear of the transmission with the adapter installed. The measurement is the length that the Atlas will accept.

FORD 25 SPLINE:

The 25 spline Atlas was designed to fit only the Bronco IIs, Ford Rangers, and Explorers. The stock transmissions used in these vehicles were normally coupled to a Borg Warner 1350 transfer case. The bolt pattern on the face of the B/W 1350 is a 5-bolt pattern which we mirror on the Atlas transfer case. Fitting an Atlas into these vehicles will require either a body lift (such as the Daystar mounts we offer on Page 4) or modifications to the stock crossmember. The rotation of the Atlas is identical to stock. The Atlas 2 speed is the only unit available for these transmissions:

Atlas 2 Speed: P/N A25

All Ford V6 Explorers, Rangers, and Bronco lls have the same bolt pattern and splines when coupled to a 1350 transfer case. The adapters we manufacture for these vehicles to fit the C4 and AOD would also have this same pattern.