Replacement CJ7 Locking Hubs

New Mile Marker 480 Locking Hub

Got off of a beautiful trail the other day and went to unlock my hubs only to find that the driver side was stuck.  I finally had to take a vice-grip to it in order to force the dial over to 2 wheel drive.

Upon inspection, I was shocked to find many plastic parts/gears and the dial itself...!  I also found one of the ring gears to be cracked which caused the bind.

I began scouring many sites on locking hubs only to find out that the Warn and SuperWench no longer make their much recommended locking hubs for any of the CJ7 models.  I did find that MileMarker does make a quality, all metal, replacement and is well reviewed.

CJ Universal (6-bolt 27 spline)    ’72-’86    Mile Marker #457    1 Pair

CJ Universal (5-bolt 27 spline)    ’80-’86    Mile Marker #470    1 Pair

AMC ran various combinations of axles so be sure to check bolt pattern.  Mine is a mid-year 1986 with the Dana 30 front axle and 5 bolt pattern.

Parts:

Mile Marker #470

10 each 3/8-16 x 1 1/2" Grade 5 zinc plated, hex head bolts

Gasket Maker (I used Permatex 25228 The Right Stuff)

Removal Procedure:

1. Put the front end on jack stands so that tires clear ground.
2. Remove cap from existing locking hubs.
3. Remove circlip from axle spindle.
4. Remove locking hub bolts and pull straight off.  I had to tap with a dead blow hammer.

Installation Procedure:

• Clean off spindle (could be a good time to inspect wheel bearings).
• Dress surface of wheel hub and address if necessary.
• Before removing locking hub cap, mark orientation of cap to hub with a piece of painters tape and don't rotate the dial after removing cap.
• Separate the locking hub cap from the locking hub.
• Wipe, with denatured alcohol, mating surfaces of wheel hub and locking hub.

• Note: I decided not to use the paper gaskets that came with the locking hubs.
• Create a bead of the gasket maker on the wheel hub only; allow 15 minutes to skin over.
• Then finger tight the locking hub to the wheel hub until there is squeeze out.  Clean up squeeze out.
• Wait the prescribed time, at least an hour, before torquing down to 30 ft-lbs.
• Reinstall circlip to spindle.  You may need to use a pry bar at the u-joint behind the wheel to push the spindle deeper into the wheel hub to expose the groove for the circlip.  Make sure the circlip is in the groove.

• Clean mating surfaces of locking hub and cap.
• Apply gasket maker on locking hub mating surface only; allow 15 minutes to skin over.

• While aligning the painters tape on the hub and the cap, finger tight the locking hub to the wheel hub until there is squeeze out.  Clean up squeeze out.
• Wait the prescribed time, at least an hour, before torquing down to 30 in-lbs.
• Once the cap is secured to the hub it is okay to turn the selector dial.

The Mile Marker locking hubs come also with a nifty little wrench that gives a little more leverage if needed... thoughtful.

Hope this helps,

Mike

Lift - Wheels - Tires

Body Mount

• Prothane: CJ7 80-86 Body Mount Bushings : 1-111-BL
• Installation Instructions

• 25 each Thickened 2" OD Stainless Washers (1/8" Thick x 2" OD x 3/8" ID)
• may have to drill out some to 1/2" ID (Jeeps of this era used a variety of bolt sizes.
• 3/4" Stainless Tubing (3/4" OD x 1/2" ID x 1/8" Wall)
• will have to cut to various lengths.
• Bolt Kit: 
• Fits Jeep CJ 76-86 Body Mount Bushing Bolts GRADE 8 CJ5 CJ7 Scrambler COMPLETE
• various sizes to cover multiple manufacturing discrepancies.

• Shackles • Front 1/2" Lift • Warrior 121
• Shackles • Rear 1/2" Lift • Warrior 120

Axles

• U-Bolts - Front: Pro Comp 50010
• U-Bolts - Rear:

Shocks

• Front: KYB GR-2/ Excel-G  #344087
• Rear: KYB GR-2/ Excel-G  #344085
• Stabilizer: Monroe Monro-Magnum  #SC2940

Wheels

• Make: American Racing
• Style: AR1725885B
• Size 15 x 8
• Bolt Pattern 5 on 5.5
• Backspace: 3.75"
• Offset: -19mm
• Bore: 4.25"
• Alloy
• Satin Black

Link

Tires

• Make: Kuhmo
• Model: Road Venture AT51
• Size: 31 x 10.50 R 109R

Link

Lug Set

• Make: DPAccessories
• Model: LCS3A2HC2CH04024
• Color: Chrome
• Size: 1/2"-20 Conical (24 each)
• Height: 1.35"
• Spline: 6/Tuner
• Key: 3/4" (OEM) and 13/16"

• 
  

Description

1986 Jeep CJ7 (Mid-Year)

• Engine: 258 cu in (4.2 L) AMC I6 99.4 PS (73 kW; 98 hp), 261 N·m (193 lb·ft)
• Transmission: Borg-Warner T-5 (5-speed with a Dana 300)
• Transfer Case: Dana 300
• Rear Axle: Dana 44 Wide Track (mid-year 1986)
• Front Axle: Dana 30 Wide Track
• Carburetor: Weber 32/36 DGEV
• Miles at Purchase: 144,000
• Current Mileage: 151,000

Regular Maintenance:

• Air Filter Element (Clean) • Redline • 99400.291 • 145,000 • 6/2017
• Brake Fluid Flush • Carquest  DOT3 • 145,000 • 6/2017
• Brake Job • Front • • xxx,xxx • xx/xxxx
• Brake Job • Rear • • xxx,xxx • xx/xxxx
• Dana 30 Gear Oil • Carquest 80w-90 • Fel-Pro RDS-55019 Gasket • 145,000 • 6/2017
• Dana 44 Gear Oil • Carquest 80w-90 • Fel-Pro RDS-6629 Gasket • 150,000 • 1/2019
• Grease Job • All Points • Valvoline SynPower Synthetic • xxx,xxx • xx/xxxx
• Fuel Filter • Napa • FIL 3040 • 144,000 • 11/2016
• Oil - Engine • Castrol GTX 10w-30 Conventional • 151,000 • 10/2019
• Oil Filter • Purolator ONE PL25288 • 151,000 • 10/2019
• Power Steering Fluid • Carquest • 144,000 • 11/2016
• Spark Plugs • Autolite Platinum AP45 (Gap .45) • 144,500 • 4/2017
• Tire Rotation • 144,000 • 11/2016
• Transmission (T5) Fluid • Valvoline Syncromesh MTF • 150,500 • 5/2019
• Transfer Case Gear Oil • Carquest  80w-90 • 144,500 • 4/2017

Replaced Parts:

• Air Filter • Redline • 99217.332S • 145,000 • 6/2017
• Axle U-Bolts • Rancho • Front RE2435 • xxx,xxx • xx/xxxx • Pending
• Axle U-Bolts • Rancho • Rear RE2445 • 150,000 • 1/2019
• Battery • Interstate MT-56 • 145,900 • 11/2017
• Belt - Fan • Napa XXXXXX • 144,000 • 11/2016
• Belt - Alternater • Napa 25-7430 • 149,000 • 10/2018
• Body Mounts/no lift • Prothane 1-103-BL • xxx,xxx • xx/xxxx • Pending
• Brake Master Cylinder • Napa NMC M2506 • 144,500 • 4/2017
• Bumpers (front/rear) • ProComp 66162/66167 •147,900 • 12/2017
• Clutch R & R • Napa 1101007 (LUK/Timken) • 145,000  • 7/2017
• Clutch Linkage • Rugged Ridge 16919.30 • xxx,xxx • xx/xxxx • Pending
• Coil • 144,000 • 11/2016
• Distributor • 144,000 • 11/2016
• Distributor Cap • BWD C193 • 144,500 • 4/2017
• Distributor Cap Adaptor • BWD C193A • 144,500 • 4/2017
• Distributor Rotor • BWD D219 • 144,500 • 4/2017
• Exhaust, Catalytic Converter, Muffler • Custom • 144,000 • 11/2016
• Fuel Pump • Mechanical • Napa NNP B0116P • xxx,xxx • xx/xxxx • Pending
• Fuel Sending Unit • MTS CJSU-20 • xxx,xxx • xx/xxxx • Pending
• Gauge • Oil Pressure-Mechanical • Auto Meter 2421 • xxx,xxx • xx/xxxx • Pending
• Gauge • Voltmeter • Auto Meter 2592  • xxx,xxx • xx/xxxx • Pending
• Headlights • Sylvania H6024 XV • 144,500 • 4/2017
• Hose • Fuel Tank Fill & Vent • MTS CJFHCJ7-20/CJVHCJ7-20 • 147,900 • 4/2018
• Hose • Water Pump Bypass • Gates 18763 • 144,000 • 11/2016
• Oil Pan Gasket • 144,000 • 11/2016
• Radiator • Carquest • 144,000 • 11/2016
• Rear Main Seal • 144,000 • 11/2016
• Seats (front) • Bestop TrailMax II Pro • Spice • 146,900 • 11/2017
• Seats Belts • SeatBeltsPlus • Q8291P • 147,900 • 02/2018
• Shackles • Front 1/2" Lift • Warrior 121 • xxx,xxx • xx/xxxx • Pending
• Shackles • Rear 1/2" Lift • Warrior 120 • 150,000 • 1/2019
• Shackle Bushings • Front • Prothane • 1-1002-BL/1-1003-BL • xxx/xxx • Pending
• Shackle Bushings • Rear • Prothane • 1-1003-BL • 150,000 • 1/2019
• Shocks Front • KYB GR-2/ Excel-G  #344087 • 144,000 • 11/2016
• Shocks Rear • KYB GR-2/ Excel-G  #344085 • 144,000 • 11/2016
• Spark Plug Wires • Motorcraft WR4050 • 144,500 • 4/2017
• Speedometer Cable • Crown J5752282 • 81" • xxx,xxx • xx/xxxx • Pending
• Spring Bushings • Front • Prothane • 1-1002-BL • xxx,xxx • xx/xxxx • Pending
• Spring Bushings • Rear • Prothane • 1-1003-BL • 150,000 • 1/2019
• Steering Stabilizer • Monroe Monroe-Magnum  #SC2940 • 144,000 • 11/2016
• Starter • 144,000 • 11/2016
• Starter Solenoid • 144,000 • 11/2016
• Steering Box Brace • M.O.R.E SB7686Z  • xxx,xxx • xx/xxxx • Pending
• Steering Column Lower Bearing • Wolffeng • M109SS • xxx,xxx • xx/xxxx • Pending
• Tailgate Seal • Metro Moulded TG 97 • 144,000 • 11/2016
• Tie/Connecting Rod Dust Seals • Prothane • 145,200 • 7/2017
• Timing Chain • 144,000 • 11/2016
• Tires • Kumho Road Venture AT51 • 31 x 10.50 R 109R • 144,000 • 11/2016
• Transfer Case Damper • 5358879 • 150,500 • 5/2019
• U-Joints • Front Drive Shaft (Dana 30) • Spicer 5-260 • xxx,xxx • xx/xxxx • Pending
• U-Joints • Rear Drive Shaft (Dana 44) • Spicer 5-153X • 144,000 • 11/2016
• Valve Cover & Gasket • Crown RT35005 • 144,000 • 11/2016
• Wheels • American Racing AR1725885B • 15 x 8 • 144,000 • 11/2016

Modified/Rebuilt/Added Parts:

• Bumpers (rear) Frame Tie-In Brackets • Custom •147,900 • 01/2018
• Heater Rebuild//Blower Motor Upgrade • 147,900 • 01/2018
• Seat Heaters • WATERCARBON STHKC100102 • xxx,xxx • xx/xxxx • Pending
• Storage Box • UWS 36 Footlocker • 144,500 • 4/2017
• Storage Box • UWS ATV 32 • 149,000 • 10/2018
• Tailpipe Hanger Bracket • Custom • 147,900 • 01/2018

* Denotes In Progress/Planned