The B&M TH-400 PreRunner/Trail automatic transmission is for RWD GM SB/BB applications. This transmission features a large diameter bushing for use with a large diameter yoke (1-7/8 in) and includes a deep, cast aluminum pan. This transmission also features an automatic/forward valve body, a 2.48:1 first gear ratio, 1.48:1 second gear, rebuilt front pump (utilizes B&M pressure regulator spring and shims), all new B&M high performance friction plates, new intermediate roller clutch, new kickdown band with welded anchors, machined center support with new case saver ring, all new thrust bearings and races, and new adjustable modulator and silencer ring, Max 600 HP/550 Ft/Lbs. Intended for off road/trail use.
B&M Full Race Automatic Transmission – GM TH400
1965-1991 Chevrolet Small Block and Big Block 2-Wheel Drive, Automatic Shift Valve Body.
| Dimensions | 35 × 21 × 22 in |
|---|---|
| Automotive Item Grade | High Performance |
| Brand | B&M |
| Built-In Transmission Shield | No |
| Case Material | Cast Aluminum |
| Color | Black |
| Control Type | Hydraulic |
| Cooler included | No |
| Core Change Applicable | No |
| Dipstick included | No |
| Drive Type | RWD |
| Emission Code | 5 |
| Friction Plates | New |
| Gear Ratio-First | 2.48 |
| Gear Ratio-Second | 1.48 |
| Gear Ratio-Third | 1.00 |
| Horsepower Rating (HP) | 600 |
| Part Type | High Performance |
| Product Type | Transmission |
| Reverse Gear Ratio | 2.00 |
| Tailshaft Length (In) | 4 |
| Torque Converter Included | No |
| Torque Rating (Ft/Lbs) | 550 |
| Transbrake | No |
| Transmission Model | TH400 |
| Transmission Pan Finish | Natural |
| Transmission Pan Material | Aluminum |
| Transmission Pan Type | Deep, Cast |
| Transmission Series | Full Race |
| Transmission Speeds | 3 |
| Transmission Type | Automatic |
| Valve Body Pattern | Forward |
| Valve Body Type | Automatic |
| Warning | California Proposition 65 |
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