Muncie A20A1007HX31XPX is a medium-duty, 10-bolt clutch-shift PTO for compatible Allison 3000/4000 Series transmissions. This configuration has a 1-1/4-inch round keyed output shaft, HX 12 V electric/hydraulic shift, and a standard hose kit. It is intended for a correctly sized shaft connection to driven equipment, with transmission fitment and available clearance confirmed for the vehicle.
The A10 input gear and ratio-07, 0.73:1 internal gearing produce application-specific output speeds. Arrangement 3 places the shaft on the left side and low. A pump, coupling, driveline, and equipment-specific supports are selected separately. The 1X keyed-shaft output is not an SAE direct-mount pump flange.
A keyed shaft for a matched auxiliary drive
The 1-1/4-inch shaft uses a 5/16-inch key for a suitable coupling or driveline. Match the driven equipment's required speed, torque, and rotation before choosing those components. Muncie's A20 series uses tapered roller bearings and a rotatable shift cover; the included HX/PX activation components provide cab control and the transmission-pressure hose connection.
| Feature |
Practical benefit |
| Clutch-shift A20 design |
Engages the auxiliary drive through the 12 V electric/hydraulic control circuit. |
| 1-1/4-inch keyed shaft |
Supports a separately selected coupling or driveline for shaft-driven equipment. |
| Arrangement 3 |
Places the shaft left side and low relative to the PTO opening. |
| HX/PX package |
Provides the standard hose kit and 12 V activation components for this configuration. |
Technical specifications
| Specification |
A20A1007HX31XPX |
| Manufacturer part number |
A20-A1007-HX31XPX |
| Series / mounting |
A20 medium-duty clutch-shift; Allison 10-bolt opening |
| Input gear / internal ratio |
A10 for Allison 3000/4000 Series; ratio 07, 0.73:1 |
| Output speed |
99% of engine speed for the exact listed Allison 3000 application; 141% for listed compatible 4000 applications |
| Output rating |
415 lb-ft continuous and intermittent; 79 hp at 1,000 PTO rpm |
| Shift / arrangement |
HX 12 V electric/hydraulic; 3 left-side shaft-low |
| Output / hose option |
1X: 1-1/4-inch round shaft with 5/16-inch key; PX: standard hose kit |
Applications and included components
Muncie's exact builder identifies an Allison 3000 Series 10-bolt application with a 6520-series serial prefix and 99% engine-speed output. The A10 series also covers compatible Allison 4000 configurations; the ratio-07 speed there is 141% of engine speed. Confirm the specific transmission, PTO opening, chassis clearance, and drive connection rather than using the series name alone for fitment.
| Component or application |
Selection detail |
| Allison 3000 Series |
Exact builder lists serial prefix 6520xxxxxx, 99% engine speed, 415 lb-ft, and 79 hp. |
| Allison 4000 Series |
Ratio-07 series speed is 141% of engine speed; verify the exact transmission application. |
| HX/PX installation kit |
Current 48TK6720 kit includes 30T43806 12 V switch assembly, pressure switch, wiring harness, Allison input cable, standard 28-inch hose kit, studs, gasket, and labels. |
| Cab switch |
30T43806 contains rocker 30T35687, bracket 36T42362, and faceplate 36T42380. Muncie Start and overspeed control are separate options. |
Before ordering
| Check |
Why it matters |
| Transmission |
Verify the exact model, serial number, 10-bolt opening, and Allison PTO drive limits. |
| Drive connection |
Match the keyed shaft and 5/16-inch key to a suitable coupling or driveline; confirm driven-equipment rotation and chassis clearance. |
| Speed and load |
Size the driven system for the applicable 99% or 141% engine-speed relationship and 415 lb-ft PTO rating. |
| Activation and plumbing |
Provide 12 V power, connect the Allison PTO enable circuit while engaged, verify hose routing, and place the indicator in the operator's view. |
Need help confirming PTO fit and the shaft connection? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your transmission model and serial number, driven-equipment requirements, and chassis details.
