Muncie A20A1010HX3BBPX is a medium-duty, 10-bolt clutch-shift PTO configured for compatible Allison 3000/4000 Series automatic transmissions. Its BB output combines a 7/8-inch, 13-tooth SAE B spline with an SAE B two- or four-bolt pump flange. This is the direct-mount pump interface; select a pump with both matching shaft and flange dimensions.
The ratio-10, 0.97:1 gearing and HX 12 V electric/hydraulic shift suit an auxiliary hydraulic drive when the transmission application, pump speed, and load are matched. Arrangement 3 places the shaft on the left side and low relative to the opening. The PX option supplies Muncie's standard hose kit. The pump is selected separately.
Direct pump mounting with the correct SAE B interface
The rotatable output flange provides 30 indexed positions to help orient a compatible pump around nearby chassis components. That flexibility still requires a physical clearance check, especially around the pump body, hoses, and transmission. A20 tapered roller bearings, rotatable shift cover, and clutch-shift design support this configuration's mechanical and installation requirements.
| Feature |
Practical benefit |
| BB direct-mount output |
Pairs the SAE B 7/8-inch 13-tooth spline with an SAE B two- or four-bolt pump mounting flange. |
| 30-position flange |
Allows pump orientation to be adjusted for the available installation space. |
| Arrangement 3 |
Positions the output on the left side, shaft low. |
| HX/PX package |
Provides 12 V electric/hydraulic activation components and the standard hose kit. |
Technical specifications
| Specification |
A20A1010HX3BBPX |
| Manufacturer part number |
A20-A1010-HX3BBPX |
| Series / transmission opening |
A20 medium-duty clutch-shift; Allison 10-bolt opening |
| Input gear / internal ratio |
A10 for Allison 3000/4000 Series; ratio 10, 0.97:1 |
| Output speed |
131% of engine speed for the listed Allison 3000 application; 187% for a listed 4000 application |
| Output rating |
310 lb-ft continuous and intermittent; 59 hp at 1,000 PTO rpm |
| Shift / arrangement |
HX 12 V electric/hydraulic; 3 left-side shaft-low |
| Output / hose option |
BB SAE B 7/8-inch 13-tooth spline, SAE B two- and four-bolt flange; PX standard hose kit |
Applications and included components
Muncie's application record lists this exact part number for an Allison 3700/3700 SPS left-side 10-bolt opening at 131% of engine speed. The A10 series also covers compatible Allison 3000/4000 installations. Confirm the truck's transmission model and serial number with the current Muncie application data rather than assuming every transmission in those families accepts this configuration.
| Component or application |
Selection detail |
| Allison application |
Exact Muncie application record lists A20-A1010-HX3BBPX for the left-side 3700/3700 SPS opening. Verify other models individually. |
| Hydraulic pump |
Match both SAE B two- or four-bolt mounting and 7/8-inch 13-tooth female input; check pump rotation, speed, and clearance. |
| HX/PX installation package |
Current HX/PX kit 48TK6720 includes the 30T43806 12 V switch kit, pressure switch, harness, Allison input cable, 28-inch hose kit, studs, gasket, and labels. |
| Cab controls |
30T43806 contains rocker switch 30T35687, bracket 36T42362, and faceplate 36T42380. Muncie Start and overspeed control are separate options. |
Before ordering
| Check |
Why it matters |
| Transmission and opening |
Confirm the exact model, serial number, left-side 10-bolt opening, and chassis clearance. |
| Pump interface |
Verify spline, flange bolt pattern, pump rotation, mounting orientation, and room for hydraulic lines. |
| Speed and load |
Use the applicable engine-speed relationship and 310 lb-ft PTO rating; check pump limits and Allison transmission drive capacity. |
| Activation |
Provide 12 V power, connect the Allison PTO enable input as instructed, and place the engagement light in the operator's view. |
Need help matching the PTO to your transmission and pump? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with the transmission model and serial number, pump part number, and chassis details.
