Jeep facts
This is a collection of random WWII jeep facts. Read and enjoy!
Bantam BRC   Ford GP        MA            MB            GPW            GPA
Wheelbase (in.)
Lenght (in.)
Width (in.)
Weight (lb.)
Engine, make
type
cyl.
cid.
output (bhp)
Transmission
Axle ratio (:1)
Tyres
Production
(approx.) 1941
              1942
              1943
              1944
              1945

Total:
Willys                             Ford
79,5
126
54
2100
Continental
L-head
4
111.7
45
3F1Rx2
4.88
6.00x16

2.600
-
-
-
-

2600
80
129
62
2150
own
L-head
4
119,5
45
3F1Rx2
4.88
6.00x16

4458
-
-
-
-

4458
80
133
62
2160
own
L-head
4
134.2
54
3F1Rx2
4.88
6.00x16

1.550
-
-
-
-

1550
80
132
62
2450
own
L-head
4
134.2
54
3F1Rx2
4.88
6.00x16
8.598
91.421
93.210
109.102
57.517

359.848
-
91.000
80.000
74.000
32.896

277.896
84
182
64
3660
own
L-head
4
134.2
54
3F1Rx2
4.88
6.00x16

-
5.179
7.600
-
-

12.779
The name "jeep"

There are a number of stories how the name "jeep" became connected to the 4x4 1/4 ton truck General Purpose. Two of them are best known. The first one claims it is slang for the letters GP, but I think this is doubtful because it would have been "geep" instead of "jeep". The second one claims that is was named after a cartoon figure that was introduced in the cartoon series of Popeye the Sailorman in 1940: Eugene the Jeep. Eugene was a creature that could travel through the 4th dimension, and it could well have been that a GI was remembered by this little creature when he saw the jeep going trough rough terrain. I consider this the most plausible explanation, but whatever one was right, the Truck, 1/4 ton 4x4 General Purpose was soon know as the "jeep" thoughout the Allied and even Axis armed forces. It is however enjoyable to see that the high brass refused to accept the name "jeep" and kept referring to it as Truck, 1/4 ton 4x4 GP in their (un)official documents till the bitter end.

There are however some other versions of what "jeep" stood for:
- Just Enough Essential Parts
- Justify Every Expense Please (wife's version)
- Jeneraly Easy Except Paint (colour)
- Just Empty Every Pocket                                                                                    
Casting numbers:
                                        
Block#                     Head#
MB        1941-45               
638632                    639660

GPW     1942-45                GPW6015                6050

CJ2A     1946-49                641145                   
640161

CJ3A     1950-53                641145                    640161     

M38      1950-52                641087                    800376, 804392 (this engine was used till # 74419)

M201    1957-66                80101                        ?

Willys 77    1937                630282                      ?  (pre-war Willys car engine)

These numbers were casted in raised or recessed characters (not stamped) on the parts and have nothing to do with (stamped) serialnumbers. Location: block# : on the right side, between the distributor and the oilpan; head# : on the top, right front corner. Info courtesy of Ren Bernier, Joe Potter, Alisdair Brass and Jon Rogers. To view an excellent article about MB (no GPW) engines and their castingdates etc.
click here.
Note: M201 Hotchkiss blocks are almost identical to WW2 Willys blocks except for the castingnumber and some differences in the casting of the rear end, near the bellhousing.
Chassisnumber to year (Willys):

Model      Year            Chassisnumber range                Production
MA:         1941            78401 - 79900                                1.500
                1941            85501 - 85550                                    50

MB:        1941              100001 - 108598                            8.598
               1942              108599 - 200022                          91.424
               1943              200023 - 293232                          93.210
               1944              293233 - 402334                        109.102
               1945              402335 - 459851                          57.517