M201, Willys MB and Ford GPW Differences

At a quick glance, the Willys MB and Hotchkiss M201 look very similar, more alike than the Ford GPW. M201's were built from the same drawings and tools as the MB, so of course there is a close similarity, but over the life of the assembly line, small visual changes were introduced in addition to those which cannot easily be seen. Not all the changes were made from the beginning of the production run, and many Jeeps were upgraded when they returned to the factory for rebuild. The more outward changes are listed below in no particular order.

Hotchkiss M201

Willys MB

Ford GPW

Chassis Number
The Hotchkiss chassis number is stamped on the top of the left chassis rail, just ahead of the brake pipe fitting. The Willys chassis number is a tag of the left frame member.
 
The Ford chassis number is stamped on the top of the left chassis rail, just ahead of the brake pipe fitting.
The French Army chassis number is the one stamped on the top right chassis member. It places the vehicle exactly in the manufacturing order.
No equivalent Army number on the MB No equivalent Army number on the GPW
The chassis and army numbers are different from the frame number which is shown here, stamped on the side of the right frame. This number is just a unique identity given to the frame when it was made. Frames weren't used in order and so it cannot be used to identify age. M201 chassis were also made from a slightly thicker gauge steel than the MB's.
No equivalent frame number on the MB No equivalent frame number on the GPW
Body Number
On the M201, the body number was just above the fuel filter. On the MB, it was stamped onto the front edge of the left toe board gusset. On the GPW, it is stamped onto the front edge of the left toe board gusset.
 
Chassis Leg Reinforcing
M201's had a 'U' channel welded into the front chassis leg as a reinforcing piece. The radiator bracket was welded to the chassis. MB's and GPW's weren't built with the reinforcing, but some had it added post war in French Army rebuilds of Jeeps. The radiator bracket is just riveted.
 
Data Plates
The French data plate was one piece, and of course, written in French. The smaller red plate was the ERGM rebuild plate fitted when the vehicle returned to the factory for a major rework. The Willys and Ford data plate set comprise of three pieces, with details of the transmission, and transfer case positions, chassis number, date of delivery and speed restrictions in each gear amongst other info. The material varied from brass to steel and aluminium.
 
   
Instruments
Metric instruments were also fitted to French jeeps. The kph Speedo also features a reset button. Imperial instruments were fitted to the Willys MB and Ford GPW with the temperature gauge marked in Farenheit and the oil pressure in pounds per square inch.
 
The Radiator Grill

While initially looking the same, the Hotchkiss grill is different to the MB and GPW. 

The Hotchkiss grill is has a shallower depth of pressings, around 1/4 inch at the top and bottom curves.  The Willys grill is about 1/2 inch deep where the metal is folded into the curve of the vent. Early Grills were welded steel flat bar, known as Slat Grills.
 
The Ford grill is the same as the Willys, but is stamped on top with the Ford script 'f'. Early Grills were welded steel flat bar, known as Slat Grills.
 
   
The Hood Hinge
The hinge on the hood of the M201 is made from 13 segments.
 
The Willys MB is 9 segments.
 
 
On the Ford GPW, it is 11 segments, the hinge is stamped with the script 'f' on the inside ( circled in the inset picture ).
Headlights
The lights on the M201 look similar to the wartime lamp, but were designed with a one piece lens and reflector, with a separate yellow bulb which clipped into the back. The MB lights were sealed beam units, where the whole lens and reflector were the bulb, with the element sealed inside.
 

 The GPW lights were also sealed beam, and also have an 'f' stamp on the bottom of the light bowl and an embossed 'f'  on the end of the bowl mounting bolt ( see insets ).

Instrument Panel Notch
There is no notch on the M201 panel and the are more spot welds which are more pronounced. On the Willys MB and Ford GPW, there is a small rectangle notch in the top of the instrument panel, where the fairing folds over the panel.
 

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