Muncie A20A1008HX3BBPX is a medium-duty, 10-bolt clutch-shift power take-off configured for compatible Allison 3000/4000 Series transmissions. Its BB direct-mount output pairs an SAE B two- or four-bolt pump flange with a 7/8-inch, 13-tooth SAE B spline. Match both the mounting pattern and pump input shaft before selecting a hydraulic pump.
The ratio-08 gear option provides 0.84:1 internal gearing, with HX 12 V electric/hydraulic shift and a PX standard hose kit. Arrangement 3 positions the output on the left side with the shaft low. The hydraulic pump is selected separately; the PTO's output speed, torque, pump rotation, and physical clearance must suit the complete system.
Direct pump mounting with SAE B fitment
The rotatable output flange offers 30 indexed positions to help orient a matching pump. Check clearance for the pump housing, fittings, and hose bends at the selected position. Muncie's A20 design also uses tapered roller bearings and a rotatable shift cover; the HX controls provide the cab switch and connections for PTO engagement.
| Feature |
Practical benefit |
| BB pump output |
Pairs the SAE B two- or four-bolt flange with a 7/8-inch 13-tooth spline for a matching pump. |
| Rotatable flange |
Offers 30 indexed positions to help fit the pump around chassis components. |
| Arrangement 3 |
Places the output on the left side with the shaft low. |
| HX/PX package |
Provides 12 V activation hardware and the standard hose kit for this configuration. |
Technical specifications
| Specification |
A20A1008HX3BBPX |
| Manufacturer part number |
A20-A1008-HX3BBPX |
| Series / mounting |
A20 medium-duty clutch-shift; Allison 10-bolt opening |
| Input gear / internal ratio |
A10 for Allison 3000/4000 Series; ratio 08, 0.84:1 |
| Output speed |
114% of engine speed for listed Allison 3000 applications; 163% for listed 4000 applications |
| Output rating |
360 lb-ft continuous and intermittent; 69 hp at 1,000 PTO rpm |
| Shift / arrangement |
HX 12 V electric/hydraulic; 3 left-side shaft-low |
| Output / hose option |
BB: SAE B two- or four-bolt flange, 7/8-inch 13-tooth spline; PX: standard hose kit |
Applications and included components
Muncie's Allison application record lists this exact part number for the left-side 10-bolt opening on a 3700/3700 SPS application at 114% of engine speed. The A10 series also covers compatible Allison 4000 configurations, where the ratio-08 speed is 163%. Verify the specific transmission, serial details, PTO opening, and chassis layout before relying on family-level fitment.
| Component or application |
Selection detail |
| Allison 3700 / 3700 SPS |
Exact application record lists A20-A1008-HX3BBPX, 114% engine speed, 360 lb-ft, and 69 hp. |
| Allison 4000 Series |
Ratio-08 series speed is 163% of engine speed; verify the specific 4000 model and opening. |
| HX/PX installation kit |
Current kit 48TK6720 includes 30T43806 12 V switch kit, pressure switch, wiring harness, Allison input cable, standard 28-inch hose kit, studs, gasket, and labels. |
| Cab switch |
30T43806 includes 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 model, serial number, left-side 10-bolt opening, and PTO drive limits. |
| Pump fit and clearance |
Match the SAE B flange and 7/8-inch 13-tooth female pump input; check rotation and room for pump and hoses. |
| Output speed and load |
Size the pump for the applicable 114% or 163% engine-speed relationship and 360 lb-ft rating. Muncie's listed 3700 application cautions against exceeding 2,500 PTO output rpm; confirm any application-specific exception separately. |
| Activation |
Provide 12 V power, connect Allison PTO enable while engaged, and mount the engagement indicator in view of the operator. |
Need help matching this PTO to your transmission and pump? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your transmission model and serial number, pump part number, and chassis details.
