YJ Installation Page 2

The YJ Wrangler was manufactured from 1987 to 1996. In those 9 years of production, Chrysler used several different transmissions. The overall length of the transmissions (the output shaft spline lengths and tooth counts) varied. We have researched several vehicles, each with a different transmission application. The information in this section is based on those applications. We have not seen every combination Chrysler offered; therefore, some additional modifications may be needed for your vehicle but not noted.

Shift Indicator Switch

The Atlas is designed to accept the stock YJ shift indicator/modulator switch. This switch not only indicates the dashboard 4WD lights, but also activates the vacuum actuated solenoid for front axle engagement. When installing this switch into the Atlas, you must utilize the white nylon washer to obtain the proper spacing of this switch. (The .090" washer is installed with the indictor plug on the Atlas shifter housing). If your vehicle has a custom front axle, this switch can still be used - but for dashboard lights only. If you wish to omit this switch altogether, just make sure the indicator plug is secured in the shift indicator hole.

Shifter Installation

The Atlas twin stick is designed as a universal application. We recommend P/N 303000L or P/N 344000 for the correct shifter configuration. This shifter protrudes from the face of the Atlas 5-1/2", but is easily shortened to other lengths. Both handles on the shifter are straight and fit in the vehicle side-by-side. As long as your YJ is not equipped with an aftermarket console, these shifter handles should have adequate clearance.

The reduction portion of the Atlas 4 speed can be either a cable linkage or an electric shift unit. P/N 344020 is the cable linkage and P/N 344021 is the electric.

Crossmember & Body Modifications

The stock skid pan of the Jeep Wrangler may need some modifications to allow proper clearance for the Atlas. These modifications will vary depending on the transmission length and the degree of rotation you install the Atlas. Modifications are normally done to allow the transfer case skid pan to fasten directly to the frame rails without spacers. The stock rubber mount should be retained in the stock location. By placing the skid pan into position, inspect for necessary clearance. The Atlas may interfere with certain portions of the skid pan. Mark these locations, remove the skid pan and modify the pan were necessary. We also use a drain plug which is located on the inspection cover of the Atlas. You may want to open a location on the skid pan to access this plug.

With the many rotation options available with the Atlas, most offroad enthusiasts desire more ground clearance. To obtain this additional ground clearance, the Atlas is usually installed in a shallower than stock rotation. Body modifications will normally be required. To avoid these modifications, a body lift can be used. These photos show an Atlas installed with the least degree of rotation without a body lift. NOTE: The shallower rotation may provide the needed clearance on the crossmember to avoid crossmember modifications.