Late M38 and mid CJ-3A visual differences (early 1952)
Please contact me if you notice any errors or have any additions for this list. Click here for contact information. Thanks, BobW.
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M38 |
CJ-3A |
Engine |
Cylinder head has outlet for coolant bypass hose |
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PCV system has 2 valves to pressurize crankcase for deep water fording |
Common PCV system |
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Oil filter, Cuno non-replaceable cleanable element |
Canister with replaceable cartridge element |
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Bellhousing sealed |
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All pulleys have 2 grooves for 2 belts |
Single wide belt |
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Lifting rings bolted to head |
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Intake manifold has 2 plugs for optional primer jets |
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Engine numbers MCxxxxx |
Engine numbers 3Jxxxxx |
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Clutch |
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Fuel |
Houdaille Hershey Corp., Oakes Products Div. air filter has fittings for deep-water vent system |
Donaldson air filter |
Fuel tank filler is large, filler has retractable extension with filter screen, fuel outlet is on top, tank has vent line to the air filter, tank holds 13 gallons |
Fuel tank outlet is on bottom, tank holds 10-1/2 gallons |
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Waterproof Carter YS carburetor |
Carter WO carburetor |
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Exhaust |
Exhaust pipes are connected with flanges, bolts and gaskets. |
Slip fit exhaust pipe connections with clamps |
Provision for deep water fording pipe. |
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Cooling |
Larger radiator is frame mounted on the bottom with a rod to the firewall on the top. It also has 2 links connecting to the motor mounts for powerplant removal. |
Radiator is bolted to the grille on the sides |
Grille is hinged at bottom to fold down |
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Electrical |
24 volt, all components and wiring is waterproof including ignition system |
6 volt conventional |
Large frame mounted voltage regulator |
Conventional fender mounted voltage regulator |
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Trailer plug receptacle on left rear |
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Both 12v. batteries are mounted inside battery boxes |
Single 6v. battery without a box |
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Blackout driving light on left front fender |
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Ignition switch doesn't require a key |
Keyed ignition switch |
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Headlights "bulge out" from grille and have a guard over them |
Headlights are more flush with grille and have chrome trim rings |
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Military lighting system with blackout lighting |
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3 circuit breakers behind dash |
Single circuit breaker, part of headlight switch |
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Horn switch on steering box actuated by long rod from button |
Horn contacts on steering wheel nut |
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Instruments |
Gauges are mounted on a removable panel |
Gauges are mounted in the dash |
Transmission |
The top cover/shifter has improved sealing, shifter is removeable from the top |
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Transfer Case |
Has vent line to engine crankcase at fuel pump |
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Propeller Shaft |
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Front Axle |
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Rear Axle |
Rear axle vent is a valve mounted in differential cover |
Rear axle vent is a hole drilled in the left axle tube |
Steering |
Steering wheel green |
Steering wheel black |
Brakes |
Emergency brake handle left of steering column |
Emergency brake handle right of gauges |
Master cylinder cap has vent line to air filter |
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Brake drums are mounted outboard of hubs |
Brake drums are mounted inboard of hubs |
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Wheels |
1/8" hole drilled near one lug nut hole |
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Lug nuts 3/4" across flats |
Lug nuts 13/16" across flats |
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Extra raised area behind tire bead similar to more modern rims."safety bead" |
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Frame |
Tie down points bolted to frame |
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License plate holes in left rear |
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4 lifting eyes, 2 front, 2 rear |
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Large M stamped on frame at front inboard reinforcements between bumper and round x-member. Also on mounting plate for underhood battery box and other locations. Military specific parts??? |
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Reinforcements inside frame at rear axle rubber bump stop locations |
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Clutch/brake shaft pivot mount is bolted to the frame |
Clutch/brake shaft pivot mount is riveted to the frame |
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Underhood battery mounting plate surface is closer to the frame. |
Taller battery mounting plate |
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4 holes in center of frame for rear pintle hook |
6 holes in frame |
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Frame is boxed at the front and provides mounting points for a winch |
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Springs and Shocks |
No grease fitting on spring pivot bolts |
Grease fitting on spring pivot bolts |
Shocks are retained by nuts |
Shocks are retained by cotter pins |
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Heavy duty springs |
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Bumpers |
2 bumperettes on rear |
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Front bumper attached with bolts |
Front bumper attached with rivets |
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Wood filler inside front bumper |
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Fenders |
Right front fender has formed area at the rear inner fenderwell for an accessory |
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Hood |
Right side cutout for auxiliary power receptacle and fording intake pipe |
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Drain gutter bolted on with hood hinge |
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Not stamped Willys |
Stamped WILLYS both sides |
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Body |
2 wiper motors have large manual hand actuators, each motor has 2 hoses vacuum and vent. |
Driver side motor only with 1 vacuum hose. Passenger side no motor, manual wiper |
Glove box passenger side dash |
No glove box |
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Rear seat mounting plates welded to floor at indentations |
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Body side reinforcement at fuel filler is located rearward to clear larger filler |
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Windshield vent bolted on, doesn't open |
Windshield vent hinged and opens |
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Tailgate is reinforced and spare tire and gas can carrier is bolted to it. The tailgate is bolted closed. Not stamped Willys |
The tailgate opens and has WILLYS stamping. The spare tire is mounted to the passenger side of the body near the rear |
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2 top bow brackets are bolted to body |
4 top bow brackets are welded to the body |
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Front marker lights and rear taillights are recessed into body |
Front marker light housings are part of the grille, taillight is bolted to the outside of the body |
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Notches in body side and mounting points for a shovel and axe on the passenger side |
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Battery box and lid in right side cowl between the firewall and dash |
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Soft top rear of door vertical rod locates in body hole |
Rear of door vertical rod bolts to body |
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Reinforcement welded to each rear corner of body near the top |
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Large square hole with cover plate where wiring harness passes through the firewall on left side |
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Removable plate in passenger toe board floor |
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Master cylinder access cover
retained by 1/4-20 bolts |
Master cylinder access cover
retained by sheet metal screws |
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Center of the floor over the transmission is removable |
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Dash has large rectangular hole for removable gauge panel and a round hole behind the data plates panel |
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Guard over fuel filler neck and guard over each headlight |
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VIN plate behind passenger seat on wheelwell |
VIN plate passenger side of engine compartment on firewall | |
Footman loops not installed for half cabs |
Holes drilled and footman loops installed for half cabs | |
Multiple data plates on dash |
Single data plate on dash | |
4 reflectors, 2 on rear sides and 2 on the back |
1 reflector right rear | |
Rifle holder mounting brackets on windshield frame |
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4 round drain holes in floor, 2 each side, with covers |
2 oval drain holes, 1 in each side of the body | |
R/F drivers seat leg is behind PTO lever hole in floor |
R/F drivers seat leg is forward of the PTO lever hole in floor |
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Mount bracket for radio power receptacle to the right of passenger seat on body side |
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Special Equipment and Accessories |
Twist lock tool compartment lid |
Spring catch tool compartment lid |
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Folding rear seat is mounted on the sides to the wheel wells. |
Non-folding rear seat is mounted to the floor |