
Product Introduction
The 99012320097 Rear Axle Main Reducer Housing is a heavy-duty drivetrain component designed for SINOTRUK HOWO and Steyr STR truck axle systems. Manufactured according to OEM quality standards, this main reducer housing provides a strong mounting structure for the rear axle final drive assembly, supporting the installation and operation of important differential and reduction gear components.
Produced with high-strength materials and precision machining technology, the 99012320097 housing offers excellent structural strength, dimensional accuracy, and resistance against impact and vibration. The accurate machining process ensures proper alignment of internal axle components, helping maintain stable power transmission and reducing premature wear during heavy-load operation.
As a direct aftermarket replacement part, the 99012320097 rear axle main reducer housing is suitable for truck maintenance, repair, and overhaul applications. It is widely used in heavy-duty cargo trucks, dump trucks, engineering vehicles, and fleet service operations equipped with SINOTRUK HOWO and Steyr STR drive axle systems.
This product is an ideal choice for truck repair workshops, axle specialists, distributors, and wholesale spare parts suppliers. With OEM-level manufacturing quality and reliable durability, the 99012320097 main reducer housing helps restore axle performance, reduce downtime, and extend the service life of heavy-duty truck drivetrain systems.


Technical Specifications
| Item | Specification | Item | Specification |
|---|
| Product Name | Rear Axle Main Reducer Housing | Part Number | 99012320097 |
| Vehicle Brand | SINOTRUK HOWO / Steyr | Compatible Axle | SINOTRUK Rear Axle |
| Application | Main Reducer & Differential Assembly | Product System | Rear Axle Drive System |
| Compatible Models | HOWO, Steyr STR | Material | High-Strength Cast Material |
| Function | Main Reducer Gear Support & Protection | Manufacturing Process | Precision Machining |
| Installation Type | Direct Replacement | Quality Standard | OEM Standard |
| Condition | Brand New | Packaging | Export Standard Packaging |
| Dimensions | Available Upon Request | Weight | Available Upon Request |
Vehicle Fitment
| Vehicle Brand | Compatible Models |
|---|
| SINOTRUK HOWO | HOWO, HOWO A7, HOWO T7H, HOWO TX |
| SINOTRUK Steyr | Steyr STR Series |
| SINOTRUK | Heavy Duty Trucks Equipped with Compatible Rear Axles |
Payment & Shipping
| Category | Options |
|---|
| Payment Methods | T/T (Bank Transfer), PayPal, Western Union, MoneyGram, Visa, MasterCard, L/C (Letter of Credit), Alibaba Trade Assurance |
| Express Shipping | DHL, FedEx, UPS, TNT |
| Freight Shipping | Air Freight, Sea Freight, Railway Freight |
| Delivery Time | Express: 3-7 Working Days; Air Freight: 7-15 Days; Sea Freight: 20-45 Days |
| Shipping Coverage | Worldwide Shipping Available |
| Trade Terms | EXW, FOB, CFR, CIF, DDP |
Related Products Categories
| Section/System | Common Spare Parts |
|---|
| Engine Parts | Cylinder Block, Cylinder Head, Piston, Piston Ring, Crankshaft, Connecting Rod, Camshaft, Fuel Injector, Turbocharger, Water Pump, Oil Pump, Alternator, Starter Motor, Sensors |
Transmission & Drivetrain Parts
| Section/System | Common Spare Parts |
|---|
| Transmission System | Transmission Assembly, Synchronizer, Gear Set, Bearing, Oil Seal, Shift Fork, Clutch Disc, Pressure Plate, Release Bearing, PTO Assembly, Driveshaft, Universal Joint, Differential Assembly |
| Section/System | Common Spare Parts |
|---|
| Axle System | Front Axle, Rear Axle, Kingpin Kit, Wheel Hub, Wheel Bearing, Leaf Spring, Air Spring, Shock Absorber, Brake Drum, Brake Disc, Brake Chamber, Slack Adjuster, Steering Gearbox |
| Axle Components | Main Reducer Housing, Axle Housing, Differential Assembly, Bevel Gear Pair, Axle Shaft, Oil Seal, Bearing, Adjustment Nut |
Cabin & Body Parts
| Section/System | Common Spare Parts |
|---|
| Cabin Parts | Cab Assembly, Dashboard, Door Assembly, Door Lock, Mirror, Headlamp, Tail Lamp, Bumper, Grille, Fender, Seat, AC Compressor, Wiring Harness |
