The rounded hull on this vehicle indicates it's an M32B1, and the HVS suspension more specifically identifies it as an M32A1B1. This vehicle lacks the 81mm mortar, and its A-frame boom still uses the lifting boom on the right strut. This vehicle's lifting boom has three connections, rather than the two of earlier production models. The top and bottom connections were for upward and downward slopes, respectively, while the center was for raising the boom on level ground. A lifting drum is attached to the right drive sprocket, the bow machine gun is retained, and leads for the winch are visible on the hull front. The nonrotating turret includes curved plates, which is indicative of a later production vehicle. The tracks on this TRV are the rubber block T84.
The engine access doors can be seen on the lower hull, and the engine air cleaners are outboard of these doors, protected by additions to the hull rear armor. A towing pintle is mounted below the engine doors, and a stowage box is on the rear deck. The A-frame that locks the crane boom in the stowed position is attached to the upper hull rear plate.
A horizontal volute spring suspension bogie is highlighted here. The spring is centrally mounted below the shock absorber. The single and dual track return rollers are visible, and the change to dual road wheels is obvious. HVSS allowed the use of wider track and improved the performance compared to the earlier vertical volute spring suspension, and it was authorized for producion on all models of the Sherman tank in March 1944.
The boom is raised on this vehicle. Note the stowage of sprocket rings on the turret. (Picture from Catalogue of Standard Ordnance Items, 2nd edition 1944, volume 1.)
The boom is stowed on this vehicle, attached to the rear A-frame. Stowage boxes are placed around the rear deck, and the loop on the left rear upper hull was a catch for stowing a towing bar. Road wheels are kept on the rear hull, and sprocket rings are now placed on the fenders. (Picture from Tank Data, vol. 2.)
The mannequin on this vehicle is shown loading the 81mm mortar on the front hull plate. (Picture courtesy Dackelone.)