Dating cj3a

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What does this mean? How could there be less bodies than vehicles? Early in the model year Willys began to build their own bodies. Starters and Generators Starter and generator numbers are found on a tag that is riveted to their housings. Three different starters were used. The first vehicles used the Autolite MZ In mid the starter was changed to MZ, according to Autolite manuals.

Willys Service Bulletin lists a change in the starter and starter push rod at vehicle serial number CJ-3A which is in the model year. The first two starters are very similar, are activated by a foot pedal linkage, open nosed, and use a tooth flywheel. The third starter is Autolite MCH This starter is key activated with a solenoid mounted to the top of the starter and is the closed nose type. It uses a tooth flywheel.

The Universal Service Manual states that the third starter was put into production with vehicle serial number and, on a different page, engine serial number By adding the prefixes GB1 to the vehicle serial number and 3J to the engine number, the result is vehicle GB1 with engine 3J These are credible numbers for a CJ-3A and this data fits perfectly into the information collected from existing vehicles.

The engine block change to the larger rear flange also occurred at this serial number. Service Bulletin states a different engine front plate was implemented at engine 3J for the new type generator and the new generator actually entered production at vehicle number CJ-3A Then in at vehicle serial number GB1 the generator and regulators were changed again to provide a greater output.

According to Service Bulletin this generator provided a nominal 45 amp output. Thanks to Bill Norris for a copy of the Bulletin. Axles and Driveshafts One of the common improvements associated with the CJ-3A is the model 44 rear axle. The model 41 axle was actually used in the 3A until the end of the model year. The Master Parts List copyright lists this change at vehicle serial number CJ-3A very late model year.

The rear axle can be identified by the shape of the differential cover see photos at left. The model 41 axle uses a round differential cover while the model 44 cover has straight sides. A larger diameter rear driveshaft appeared at about the same time as the rear axle change. I have not been able to pinpoint when the change was made because during the model year I am seeing both small and large diameter driveshafts randomly.

By all driveshafts are large diameter. Colors The first CJ-3A windshield frames were painted the body color. Most original vehicles after mid seem to have black windshield frames instead of body color windshield frames. This is consistent with the CJ-3B, which had black windshield frames.

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This change appears at about vehicle serial number GB1 Painted Black - Revise Paint Spec. This indicates that the early s had body colored fuel tanks. The change to black fuel tanks may have occurred at about the same time as the body serial number tag was eliminated. I would like to thank everyone who has helped by providing information.

Willys CJ3A

There are far too many people to name. All the people who took the time to provide data about their CJ-3A deserve credit as this couldn't be done without them. Special thanks to Harold West for help with the data and ideas about how to analyze the information.

All comments are welcome Bob Westerman Click here for contact information. What is the model year of the Jeep? What is the original body color? What is the original color of the windshield frame? What is the original color of the wheels? What is the original color of the gas tank? Original soft top color, bow color and window size? Are the hood blocks located equal distance from the hood center seam? Does the tailgate top flange have cutouts?

Thanks to Bill Norris for copies of the Bulletins. Axles and Driveshafts One of the common improvements associated with the CJ-3A is the model 44 rear axle. The model 41 axle was actually used in the 3A until the end of the model year. The parts book copyright lists this change at vehicle serial number very late model year.

The rear axle can be identified by the shape of the differential cover see photos at left.

The model 41 axle uses a round differential cover while the model 44 cover has straight sides. A larger diameter rear driveshaft appeared at about the same time as the rear axle change. I have not been able to pinpoint when the change was made because during the model year I am seeing both small and large diameter driveshafts randomly. By all driveshafts are large diameter. The bottom of this radiator was bolted to the frame crossmember and had a rod that extended between the bracket on the radiator top tank and the firewall.

The side mount radiator was bolted to the grill on both sides instead of the frame, and lacked the top connecting rod. The change to a side mounted radiator, according to the Master Parts list copyright , was after CJ-3A Keith Buckley also added that the Air Deflector portion of the grille changed from 22 gage to 18 gage at this time. This logically was done to support the extra weight of the radiator. Hood The early CJ-3As had short hood blocks and they were not equidistant from the hood center seam.

In late to early the hood blocks changed to the taller type associated with the 3A and their location was equal distance from the hood centerline. This change appears roughly before serial number GB1 Horn Button Horn buttons change from the button inside the steering wheel nut to the rubber cover over the nut type.

Willys CJ3A

This change is appearing at approximately the same time as the to model year change. The part book lists this change at vehicle serial number Surveys of actual vehicles show that both types of buttons were used into The rubber cover is often missing from the late style. The parts book copyright states there is a "New front top kit with larger curtain lights and eliminating window frames.

New door assemblies and side curtains may be serviced for the old type with smaller windows in pairs only. The Metal door frames were also changed to make room for the larger windows. This was done by relocating the diagonal brace below the door handle. The CJ-3B continued to use the larger window type top. Colors The first CJ-3A windshield frames were painted the body color. Most original vehicles after mid seem to have black windshield frames instead of body color windshield frames. This is consistent with the CJ-3B, which had black windshield frames. This change appears at about vehicle serial number GB1 It seems that most CJ-3As have been repainted since they left the factory.

Original body color paint can often be found in areas where the re-painter missed. Look under the dash, behind bolted on components like the serial number plate, and low on the firewall where it is oily. Horizon Blue is also listed only for the Farm Jeep.

Ditzler has Hampshire Green and Horizon Blue. With all this conflicting information it is hard to decide what colors were actually used. Original wheel colors are difficult to find. The wheels on many vehicles have been replaced since wheels are easily exchanged. Did the last 3As use just black or white wheels like the later CJs? Painted Black - Revise Paint Spec.

This indicates that the early s had body colored fuel tanks. The change to black fuel tanks may have occurred at about the same time as the body serial number tag was eliminated.

More data is needed to confirm these findings. Much of this information does not seem to be written down anywhere so your input is very important to document the changes. If you own a CJ-3A, or have any information about the 3As, please fill out the following survey and e-mail it to 52cj3a warwick.

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