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Frame change from 2A to 3A style?
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athawk11 View Drop Down
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    Posted: 19 July 2021 at 1:37pm
Oldpappy,
I agree that the difference between the late 2A frame and the 3A frame is the offset motor mounts, but to keep things clear...

There are some distinct differences between the 3A frame and the M38 frame.  Your response appears to suggest that they are the same.
1- 1946 CJ2A   
2- 1949 CJ3A
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Oldpappy View Drop Down
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I have had two 48 CJ2As which were built on the 3A style frames. I assume both were late 48 production. Both of these Jeeps had the later style steering box and cross member.

The only difference I found between these frames and the ones used for the 3A / M38 is the engine stands are not offset as they are on the ones used for the later engine plate.

 
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Bit late on this thread but mine is 221047 and it’s a later frame
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Hamhog View Drop Down
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Another question.

In regard to the rivets that fasten the bumper to the frame...there are 4 on each side. 1 on the top, 1 on the front, and 2 on the bottom. So an original bumper should only have those holes and the 2 for the front ag weight and the hand crank hole...correct? I see reproduction bumpers with what looks like 4 extra holes. Can anybody post a pic of an unmolested, original late-style 2A bumper?

Thanks in advance.
Dave
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Thanks guys.
Dave
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I just realized Bob W post was 9 yrs. ago, man I hate being such a "rookie" Joe
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Originally posted by wadoyado wadoyado wrote:

Originally posted by Bob W Bob W wrote:

<FONT face=Arial>

I have been saving frame information from the web when I see a photo and serial number posted together. Now I added Russ and Allen to the list. Some of you will probably recognize your serial numbers.


Here is what I have so far.


195513 early frame


199079 change to inverted bell crank 6/11/48 per Bulletin 48-43 (still early type frame)


206711 early frame


209949 early frame


215648 change to late style frame 9/20/1948 per Bulletin 48-60


217424 late frame


219579 late frame


219635 late frame


219719 late frame


222638 late frame


223579 late frame


224206 late frame


From this data it looks like serial number 215648 is actually the frame change point. I would not be surprised if there were a few frames that fall outside of this range. If anyone has a 1948 or 49 CJ-2A please let us know your serial number and what type frame you have.[/P

The later Parts Manuals complicate deciphering the frame change point because late style frames, plus the additional components necessary to retrofit them, quickly superceded the 2 early frames.


There really isn't much in common between early and late frame types. Here are a few differences that stand right out. The front bumper attachment, transmission crossmember attachment, clutch and brake pedal shaft bracket, and shock mounts. Here are some photos of the late type frame.



Passenger side front bumper attachment

 

 

 


Transmission crossmember, body mount, and pedal bracket.


 

 


Shock mounts.

    Thought I'd add to the confusion a little. My late 48 208783 owned since 1950 is definetly a 3a frame. I think the change was more likely around 199079, a clue I think is in the master cly. The large hole iron MC are wider apart and need 3/8 threaded mounts on the frame. My frame looks like the one pictured, different bell crank, master cyl. crossmember ect. Thanks Joe Wadoyado
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Originally posted by Bob W Bob W wrote:

<FONT face=Arial>

I have been saving frame information from the web when I see a photo and serial number posted together. Now I added Russ and Allen to the list. Some of you will probably recognize your serial numbers.


Here is what I have so far.


195513 early frame


199079 change to inverted bell crank 6/11/48 per Bulletin 48-43 (still early type frame)


206711 early frame


209949 early frame


215648 change to late style frame 9/20/1948 per Bulletin 48-60


217424 late frame


219579 late frame


219635 late frame


219719 late frame


222638 late frame


223579 late frame


224206 late frame


From this data it looks like serial number 215648 is actually the frame change point. I would not be surprised if there were a few frames that fall outside of this range. If anyone has a 1948 or 49 CJ-2A please let us know your serial number and what type frame you have.


The later Parts Manuals complicate deciphering the frame change point because late style frames, plus the additional components necessary to retrofit them, quickly superceded the 2 early frames.


There really isn't much in common between early and late frame types. Here are a few differences that stand right out. The front bumper attachment, transmission crossmember attachment, clutch and brake pedal shaft bracket, and shock mounts. Here are some photos of the late type frame.



Passenger side front bumper attachment

 

 

 


Transmission crossmember, body mount, and pedal bracket.


 

 


Shock mounts.
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jpet View Drop Down
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Originally posted by Hamhog Hamhog wrote:

Yes. On the later style frame, the bumper is riveted directly to the frame. So the frame flared at the end? Top and bottom? Do you know how much?
I don't have an exact measurement, but it's about 3-3:4" tall to fit the inside of the bumper.
CJ2A #29110 "General Willys"
MB #204827 "BAM BAM"

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Originally posted by Hamhog Hamhog wrote:

Anybody got a picture of the frame, as it should be, with the bumper off?
CJ2A #29110 "General Willys"
MB #204827 "BAM BAM"

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anybody know if there is a stamped serial number on the frame or tub??
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Hamhog View Drop Down
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Anybody got a picture of the frame, as it should be, with the bumper off?
Dave
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captianpattson View Drop Down
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I can't figure out how to post pictures from my phone. But I measured it and it's 3.75 inches tall
'49 CJ2A in fewer pieces than before
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Hamhog View Drop Down
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Yes. On the later style frame, the bumper is riveted directly to the frame. So the frame flared at the end? Top and bottom? Do you know how much?
Dave
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When you say without bumper gusset do you mean without separate ones? They flared out the end of the frame to incorporate a gussety effect...
'49 CJ2A in fewer pieces than before
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Hamhog View Drop Down
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Does anybody know if the late frame without bumper gussets, still have the single hole on the top of the frame, that looks to be about 6-8 inches back?
Dave
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Originally posted by russnj russnj wrote:

Nice! Thanks A lot Bob!
It seems mine falls in the late range 219635 is my serial number, 211728 is my body number. What would the changes to look out for to be sure? I have always been skeptical of both of my tags since they are pop riveted onto the body.

WFB: Mule and my 2A are only 84 numbers apart! If my tags are correct that is.
They must have been made within a few days of each other.

Russ

Russ,

I know this is an old thread but our Jeeps are only 72 Jeeps apart!  I've got an emerald green CJ2A:

Serial Number 219707
Body Number 212772
Engine Number J249019

Dave
1949 CJ2A #219707
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Motor mounts changed perhaps, but it would be much more obvious if the motor mount bracket was replaced, the factory bracket was riveted in. Here's my 49 frame showing the brackets parallel.
There was also no strapping on my frame, they are all one piece
'49 CJ2A in fewer pieces than before
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