QK4904 Replacement Vacuum Motor Kit for Dana CAD Front Axles

QK4904 Replacement Vacuum Motor Kit for Dana CAD Front Axles in 1989-2002 Dodge Dana 44, Dana 60 and Jeep 4x4s for most Dana axles with Vacuum Controlled Central Axle Disconnect (CAD). This also fits some Jeeps with CAD.  Each Vacuum Shift Motor is tested for leaks before shipping out!

Kit includes new QU42203 Replacement Vacuum Actuator, QU40090 gasket, 1 QU40162 C-clip for outboard shaft groove, 1 QU40223 Motor retaining E-Clip, 2 QU40156 shift fork pads, 1 QU50048 hose clamp, QU40272 Motor to Housing O-ring, bolts, lock washers, & S9978 Threadlocker. Imported. (Beware of cheap imported substitutes! We tested some motors that were from China but none of them would hold vacuum in our quality control testing!)

Need More Info? Use the handy Links below to access over 40 years of Dan's product and vehicle specific Tech Notes to easily get the information you need for your vehicle's repair, maintenance, or upgrade project!

Dan the Gear Man® Tech Notes:
Troubleshooting
CAD Engagement Issues
While your Truck is Apart
Matching Parts
Applications

Tech Note 1: Troubleshooting
Troubleshooting axle disconnect problems can be tough if you do not have patience, a vacuum pump and vacuum gauge. Quite often, by the time you decide you can not live with erratic shift performance, the original issue has caused one or more further difficulties. Shifting problems can be vacuum, mechanical, or both. To help you understand the vacuum system, TSB4903 color coded vacuum schematic will soon be available. We are also working on Tech Service Bulletin 4904 Diagnosing Vacuum Controlled Disconnect Problems on Dodge and Jeep Vehicles to help you troubleshoot the many possible sources of shifting problems. TSB4904 will be released as soon as I can get it done, but in the mean time, I am semi-retired, so unfortunately, I am no longer available to help you troubleshoot your CAD system over the phone or via e-mail.

Tech Note 2: CAD Engagement Issues
If you are having Central Axle Disconnect engagement problems, there are usually multiple causes. Some of the most common issues that need to be checked are (and part numbers for most Dodge applications):
Vacuum Shift Motor Leak: Unit will not hold steady vacuum. Replacement is required.
Bent Vacuum Motor Shift Rod: Replacement is required.
Worn Axle Shaft Bushings: Replacement is required, see QK4625, QK4646, QK4626.
Differential Output Shaft Splines Worn: Replacement is required, see QU40300, QU10943.
Stud on End of Differential Output Shaft Worn Undersize: Replacement is required, see QU40300, QU10943.
Tips of Shift Collar Splines Worn: Replacement is required, see QU40246, QU40274.
Shift Fork Bent or Pads Missing: Replacement is required, see QU40156, QA4628, QA4760.
Vacuum Line Leak (VERY common on these older trucks): See QU11061, QU10942, and QU11062
Transfer Case Vacuum Switch Bad: Replacement is required, see QU10569

Tech Note 3: While your Truck is Apart
Given the era of trucks this Kit fits, if you need to remove the axle shafts, it is recommended you replace the inner axle seals which can become hard and brittle with age. Some available Kits with Installation Tools and Seals include:
QK4620 for 1988 to 1999 Dodge Ram with CAD
QK4621 for 2000 to 2002 Dodge Ram with CAD
QK4601 for most 1984-1987.5 Jeeps with CAD
QK4624 for most 1987-1996 Jeeps with CAD

Tech Note 4: Matching Parts
QA4628 CAD Shift Fork Kit
QU40317 CAD Shift Housing
QU11062 Frame to Axle Vacuum Line Kit 1994-2002 Dodge Ram all with CAD
QU10942 Main Vacuum Harness, 1994-1997 Dodge Ram all with CAD
QU11061 Main Vacuum Harness, 1998-2002 Dodge Ram all with CAD
QU10569 Transfer Case mounted Control Switch for Front Axle CAD
QU40246 CAD Axle Shaft Shift Collar 1994-1999 Ram 2500, Ram 3500, 1994-2001 Ram 1500
QU40274 CAD Axle Shaft Shift Collar 2000-2002 Ram 2500, Ram 3500
QK4627 CAD Small Parts Kit
QU40333 Differential Output Shaft 1994-2001 Dana 44 with CAD, 30 splines inboard x 15 splines outboard
QU40300 Differential Output Shaft 1994-1999 Dana 60 with CAD, 30 splines inboard x 15 splines outboard
QU10943 Differential Output Shaft 2000-2002.5 Dana 60 with CAD, 32 splines inboard x 18 splines outboard
QK4620 Inner Axle Shaft Seal Kit with Installation Tools for 1988 to 1999 Dodge Ram with CAD
QK4621 Inner Axle Shaft Seal Kit with Installation Tools for 2000 to 2002 Dodge Ram with CAD
QK4601 Inner Axle Shaft Seal Kit with Installation Tools for most 1984-1987.5 Jeeps with CAD
QK4624 Inner Axle Shaft Seal Kit with Installation Tools for most 1987-1996 Jeeps with CAD
QK4732 Outer Axle Shaft Nut and Washer Kit for Dodge Ram
QU40236 Dana Original Equipment Model 30 Differential Cover Pan Gasket
QU42027 Dana Reusable Model 30 Differential Cover Pan Gasket
QU40214 Dana Original Equipment Model 44 Differential Cover Pan Gasket
QU42028 Dana Reusable Model 44 Differential Cover Pan Gasket
QU40367 Dana Original Equipment Model 60/70 Differential Cover Pan Gasket
QU42029 Dana Reusable Model 60 Differential Cover Pan Gasket

Applications:
DODGE:
Ram 1500: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
Ram 2500 and Ram 3500: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
Ram 2500 and Ram 3500 with CAD Axle: 2002

JEEP:
Cherokee (XJ): 1991, 1992
Wrangler (YJ): 1991, 1992, 1993, 1994, 1995