IDENTIFICATION
| Model | Ring Gear Size | Axle Model |
|---|---|---|
| Dakota & Durango | 8 1/4" | (1) |
| 9 1/4" | (1) | |
| Ram Pickup | 9 3/4" | 248 RBI |
| 11" | 286 RBI | |
| Ram Van/Wagon | 8 1/4" | (1) |
| 9 1/4" | (1) | |
| 9 3/4" | 248 RBI | |
| (1) Manufacturer does not designate axle model. | ||
| (1) | Manufacturer does not designate axle model. |
TRAC-LOK DIFFERENTIAL APPLICATION (REAR AXLE)
Note. For rear axles with limited-slip differentials, see POWER-LOK - RAM PICKUP article.
DESCRIPTION & OPERATION
A Rear Beam-Design Iron (RBI) axle is an iron casting axle and differential housing with axle shaft tubes extending from either side. Tubes are pressed in, to form a one-piece full-floating axle housing.
Trac-Lok differential assembly is optional equipment. The Trac-Lok differential assembly is a limited-slip type differential. It is similar in operation to a conventional type differential, except for 2 clutch packs located at the side gears in the differential case. (Схема №1) Clutch packs provide differential action when required for turning corners, and transmit equal torque to both wheels when driving straight ahead.
AXLE RATIO & IDENTIFICATION
Axle ratio can be identified by axle identification tag attached to axle housing cover. See AXLE RATIO SPECIFICATIONS table.
| Application | Ratio |
|---|---|
| 8 1/4" & 9 1/4" | 3.21:1, 3.55:1 & 3.92:1 |
| 248 RBI | 3.55:1, 4.10:1 |
| 286 RBI | 3.54:1, 4.10:1 |
AXLE RATIO SPECIFICATIONS
| WARNING | Whenever rotating wheels, DO NOT use engine to rotate wheels unless both rear wheels are off the ground and vehicle is securely supported. |