|Date of first acceptance||1957|
|Height over cupola||109.0"
|Width over track shrouds||128.5"
|Ground pressure, zero penetration||9.2psi
|4.2" Mortar M30||8731738 in rear hull;
Ground Mount M24A1 stowed on rear hull
(25° left and right;
|+45° to +59°
|.50cal TTHB MG||M13 cupola||2205 rounds||360°
|Infrared periscope M19 for driver|
|Rolled and cast homogeneous steel|
|Location||Thickness||Angle from vertical|
|Engine||Twin GMC Model 302; 6 cylinder, 4 cycle, inline gasoline|
|Torque||Net: 508 ft-lb@1800rpm
Gross: 530 ft-lb@1800rpm
|Transmission||Twin Hydramatic Model 301MG, 4 speeds forward, 1 reverse|
|Steering||Controlled differential, steering levers|
|Type||Road wheels||Track return rollers|
|Torsion bar||5 individually sprung dual/track||3 dual/track|
|Drive sprockets||Idlers||Shock absorbers||12-tooth front drive||Dual compensating at rear of track||On first and last road wheels/track|
|Center guide, single pin, steel with detachable rubber pad|
|Shoes/track||72||Ground contact length||121.25"
|Max level road speed||27mph
|Max water speed||3.5mph
|Max vertical obstacle||18"
|Min turning diameter||30'
|Max fording depth||Floats||Cruising range||~100mi, roads
The M84 mortar carrier was based on the M59 armored personnel carrier. The mortar was mounted in the passenger compartment, facing the rear, and the rear roof hatches were reconfigured to include front, center, and rear hinged hatches, all of which folded to the front when the mortar was in use. The escape hatch in the rear ramp was relocated from the left to the right side, and the mortar ground mount was then stowed on the left of the ramp. Because it weighed substantially more than the M59, the M84's air intake and exhaust grilles were provided with collapsible snorkels for use when swimming.