Reference Guides

1941-1945 Willys MB, Ford GPW, G-503

4 Cylinder “L” Flat Head chain timed Engine; 6 Volt electrical system; No Tailgate; 2 Piece Split Windshield W/ Studs across the top for the top; Rear Mounted Spare Tire; Pass Side Glove Box (pictured); Center Dash Emergency Brake Handle; Rear Wheelhouse Tool Boxes; ax and shovel intentions on drivers side, Recessed Flip up headlights (Pictured), Two piece split rims. Dana 25 front and Dana 27 Rear axle, T-84 transmission. Steering bell crank located on front axle housing

Ford will have a channel front Cross Member (pictured). Willys will have a tube front cross member (pictured).

Exceptions to the standard MB GPW: Very early production will have either script Willys (block letters) or Script Ford (Cursive script pictured) on drivers side rear panel. First contract Willys MB will have a Metal Bar grill or Slat Grill(pictured)

1945-1948 Willys CJ2A

4 Cylinder “L” Flat Head Gear Timed (very early Chain timed); 6 Volt electric system; Tailgate; 2 Piece Split windshield W/ Studs for top mounting; Side Mounted Spare Tire; No Glove Box; Center Dash Emergency Brake Handle; Tool Box Under Passenger Seat; ID plates on passenger side fire wall under hood (pictured). Willys script in hood, windshield, Tailgate; Front bumper is attached with Gussets (Pictured). Draw bar on rear cross member (Pictured). Dana 25 front axle, Dana 41 or 44 rear axle, T90 transmission

Remember: 1948 is a transition year between the CJ2A and CJ3A.

1948-1952 Willys CJ3A

1948-1952 CJ3A

4 Cylinder “L” Flat Head gear timed engine; 6 Volt; Tailgate; One Piece Solid Windshield; Side Mounted Spare Tire; No Glove Box; Center Dash Emergency Brake Handle; Tool Box Under Passenger Seat; front bumper mounted directly to frame (CJ3A frame horn with raised portion for bumper pictured) , Draw bar on rear cross member (pictured); Willys script on hood and tailgate, Identification plates on passenger side fire wall under hood (pictured), Dana 25 front axle, Dana 41 or 44 rear axle, T-90 transmission

NOTE: Remember 1948 is a transition year between the CJ2A and CJ3A.

1950-1952 Willys M38 G-740 or MC

1950-1952 Willys M38 Military Jeep

4 Cylinder “L” Flat Head gear timed engine; 24 Volt; Tailgate; One Piece Windshield ; Rear Mounted Spare Tire; Passenger Side Glove Box; Emergency Brake Handle To Left Of Steering Column; Tool Box Under Passenger Seat; Bumper bolts directly to frame (pictured), small glove box on passenger side dash (pictured); Large mouth fuel tank; ax and shovel intentions on passenger side. Data plates on Dash, Single battery box on cowl (pictured); no Willys Scripts. This jeep is also known as the MC or G-740, T90 transmission, Dana 25 front axle, Dana 44 rear axle.

1952-1971 M38A1, M38A1CDN, MD or G758

4 Cylinder 134F overhead intake valve engine; 24 Volt; No Tailgate; One Piece Split Windshield ; Rear Mounted Spare Tire; Driver’s Side Glove Box; Emergency Brake Handle On Floor Between Seats; Tool Box Under Passenger Seat, no Willys scripts, Data plates on dash: large mouth fuel tank, large round indentation on passenger side front quarter Panel (pictured), Battery box for two batteries on cowl (pictured). Dana 25 front axle, Dana 44 rear axle, T90 transmission.

This has several different identifications, MD, G758, M38A1C (gun jeep) M38A1CDN (Ford built M38A1 for the Canadian army), USMC Contract M38A1 (built to USMC specs in the 60’s)

1952-1971 M38A1, M38A1CDN, MD or G758

4 Cylinder 134F overhead intake valve engine; 24 Volt; No Tailgate; One Piece Split Windshield ; Rear Mounted Spare Tire; Driver’s Side Glove Box; Emergency Brake Handle On Floor Between Seats; Tool Box Under Passenger Seat, no Willys scripts, Data plates on dash: large mouth fuel tank, large round indentation on passenger side front quarter Panel (pictured), Battery box for two batteries on cowl (pictured). Dana 25 front axle, Dana 44 rear axle, T90 transmission.

This has several different identifications, MD, G758, M38A1C (gun jeep) M38A1CDN (Ford built M38A1 for the Canadian army), USMC Contract M38A1 (built to USMC specs in the 60’s)

1952-64 Willys CJ3B High Hood

1952-1964 Willys CJ3B

4 Cylinder 134F overhead intake valve engine; 6 and 12 Volt; Tailgate; One Piece Solid Windshield ; Side Mounted Spare Tire; No Glove Box; Center Dash Emergency Brake Handle; Identification plates on passenger side fire wall under hood; Willys script on hood, tailgate, grill (early models); tall hood; Tool Box Under Passenger Seat, Dana 25 front axle, Dana 41 or 44 rear axle, T90 transmission, Draw bar on rear cross member (pictured)

1954-62 M170 Front Line Ambulance

1954-1962 Willys M170 Front Line Ambulance

Four cylinder 134F over head intake valve motor, Glove box on drivers side, Tool box under both driver and passenger seats, Driver and passenger seats fold up, Tool boxes on rear fender wells, elongated body and frame. Sway bars, Tire well on passenger side entrance (pictured), tailgate with cut out holes, Battery box for two batteries on cowl (pictured), large indentation on passenger side front quarter panel (pictured), one piece windshield. Dana 25 front axle, Positive traction Dana 44 rear axle, T90 transmission

1960-85 M151 Series Military Jeeps M.U.T.T. G-838

1960-85 Military Jeep M151 series

151 C.I. four cylinder overhead valve engine, Four wheel independent suspension (pictured), horizontal grill slats (pictured), 24 volt electrical, Uni-body construction, Four speed transmission.

There were a number of variants of the M151 manufactured or field modified:

Dana 27 Rear Axle Identification

The Dana 27 rear axle was the standard WWII jeep axle. (41-45) It is also seen on the very early column shift CJ2A Jeeps in late 45′ and early 46′. This axle has solid shafts with a flange cast on the ends. These look just like a miniature 3/4 ton truck rear hub where the axle hub sticks out. (see Picture) The housing is rather boxy looking and the cover plate is almost square but with rounded corners. The early cover plates were heavy cast metal and the late ones were stamped sheet metal.

Dana 41 Rear Axle Identification

The Dana 41 rear axle was the standard production axle on the CJ2A, CJ3A, and CJ3B. This axle is what the basic jeep package came with unless it was upgraded by the dealer. This particular axle has a tall oval shaped housing with a large raised vertical portion in the cover for the ring gear. It will have the number 41 cast into the lower right support wing when facing the axle from the rear. see pictures

Dana 44 rear Axle Identification

The Dana 44 rear axle is the heavy duty axle used by the Military and as a civilian option after 1945. The 44 was used on the stock M38, M38A1, and M170 military jeeps. On the CJ2A, CJ3A, CJ3B, and early CJ5 the Dana 44 was a dealer option or upgrade. The 44 is an off center axle with a very large center chunk with a distinct shape. It will have the numbers 44 cast into the lower right support fin facing the axle from the rear. (see Pictures)

Engine 134F Four Cylinder Over Head Intake Valve

Engine 134F Four Cylinder Over Head Intake (Over head Valve) Hurricane

This engine produced a gross output of 75 hp (56 kW; 76 PS) at 4000 rpm and 114 lb·ft (155 N·m) of torque at 2000 rpm with a 7.5:1 compression ratio. It has four exhaust valves in the block and four intake valves in the head. This started production in 195o in the Willys pickup and later in the M38A1 military jeep in 1952 and CJ3B 1n 1953.

Applications:

Engine 134L Four Cylinder Flat Head

Willys 134L Four Cylinder Flat Head The engine displacement was 134.2 cu in (2,199 cc) with a 3.125 in (79.4 mm) bore and 4.375 in (111.1 mm) stroke, a very under square design. It was an L-head design, with valves parallel to the cylinders. Initial power output was 60 hp (45 kW; 61 PS) at 4000 rpm and 105 lb·ft (142 N·m) of torque at 2000 rpm with 6.48:1 compression. The L134 was phased out by the F-head or 134F beginning in 1952. There are two different styles of the 134L. The early engine in the jeeps is a chain timed motor (Approx. 1941-1946) The later 134L was a gear timed. See Pictures. To know if you have a chain timed or gear timed motor is normally pretty simple. The chain timed motor will have a short boss or flat plate molded into the casting just above the water pump (see picture of red engine) It will also have a large boss or flat casting on the passenger side of the motor just under where the oil filter is located. This is where the serial number is stamped. (also see red motor picture) The Gear timed motor will normally have a large boss or flat plate cast into the block just above the water pump this will have the serial number stamped into it. (see first black motor picture). Most of the time on the gear timed motors there will be a nickel size round boss under where the oil filter is located. (see second black motor picture) There is the rare occasion where there is a long boss under the oil filter on a gear timed motor, This is a military replacement engine or military aftermarket motor made post WWII.