105mm Howitzer Motor Carriage M371-3

M37: General
Date of first acceptance September 1945 Total acceptances 150
Manufacturers
  • American Car & Foundry Co.
  • Cadillac Motor Car Division of General Motors Corp.
Crew 7 men
M37: Dimensions
Combat weight 46,000lbs
21,000kg
Height over AAMG 112"
284cm
Length with rear stowage 216"
549cm
Howitzer overhang forward 0"
Width 118"
300cm
Tread 96"
240cm
Ground clearance 18"
46cm
Fire height 66"
170cm
Ground pressure, zero penetration with T72 tracks 11.6psi
.814kg/cm²
M37: Armament
Type Mount Ammunition Traverse Elevation
105mm Howitzer M4 M5 in front hull 126 rounds
(6 ready)
51.7°
(25.4° left and 26.3° right;
manual)
+42.8° to -10.5°
(manual)
.50cal M2HB MG Ring mount T107 at hull right front 990 rounds 360°
(manual)
Manual
M37: Armor
Assembly
Welding
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Upper front .5"
1.3cm
60°
Lower front .5"
1.3cm
45°
Fighting compartment front .5"
1.3cm
Front sides .5"
1.3cm
12°
Fighting compartment sides .5"
1.3cm
Upper rear .5"
1.3cm
Lower rear .5"
1.3cm
45°
Front top .5"
1.3cm
90°
Fighting compartment top Open
Front floor .5"
1.3cm
90°
Rear floor .375"
.953cm
90°
Howitzer shield .5"
1.3cm
0° to 38°
M37: Automotive
Engine Twin Cadillac Series 44T24; 16 cylinder (8/engine), 4 cycle, 90 vee gasoline
Horsepower Net: 220@3400rpm (110/engine)
Gross: 296@3200rpm (148/engine)
Torque Net: 480 ft-lb@1200rpm (240/engine)
Gross: 560 ft-lb@1200rpm (280/engine)
Fuel capacity 110gal
420L
Transmission Twin Hydramatic, 8 speeds forward, 4 reverse
Steering Controlled differential, steering levers
Brakes Mechanical, external contracting
M37: Suspension
Type Road wheels Track return rollers
Torsion bar 5 individually sprung dual/track 4 dual/track
Drive sprockets Idlers Shock absorbers
13-tooth front drive Dual compensating at rear of track On first 2 and last 2 road wheels/track
M37: Track
T72
Center guide, single pin, rubber bushed, steel, parallel grouser
Width 16"
41cm
Pitch 5.5"
14cm
Shoes/track 80 Ground contact length 124"
315cm
T85E1
Center guide, double pin, rubber bushed, rubber, chevron
Width 14"
(16.5" with extended end connectors)
36cm
(41.9cm with extended end connectors)
Pitch 5.5"
14cm
Shoes/track 80 Ground contact length 124"
315cm
M37: Performance
Max level road speed 35mph
56kph
Max trench 108"
274cm
Max grade 60% Max vertical obstacle 36"
91cm
Min turning diameter 46'
14m
Max fording depth 42"
107cm
Cruising range ~100mi, roads
~160km, roads

The 105mm HMC M37 was based on a lengthened chassis of the M24 Chaffee light tank, and the vehicle was modified much the same way as the 105mm HMC M7, which used the medium tank M3 or M4 chassis. The M4 105mm howitzer was the same as that used in the howitzer-armed Shermans, and was mounted on the M37 to the right of the carriage's centerline, replacing the assistant driver's position. The .50cal machine gun ring mount was to the right of the howitzer mount.

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References

  1. Hunnicutt, R.P. Stuart: A History of the American Light Tank, volume 1. Navato, CA: Presidio Press, 1992. Reprinted with permission from Stuart, R.P. Hunnicutt ©1992, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.
  2. Chamberlain, Peter, and Chris Ellis. British and American Tanks of World War Two. Frome, England: Cassell & Co., 2000.
  3. Siemers, Cary. "USA's M7, M7B1, M37 105 mm Self Propelled Howitzer." World War II Tanks & Vehicles and Advanced Squad Leader. 11 Feb 2001. 18 Feb 2001 <http://www.shadowsfolly.com/WWII/USA/M7_M37SelfPropelled.htm>.

Last updated 8 Mar 2008.
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© Copyright 2001-08 Chris Conners