This is copied from the 325D service manual:
Steering Stop Bolt Adjustment
The rear axle steering stop bolts help prevent over travel of the steering cylinder in case of impacts on rear wheels. When the steering cylinder is fully extended, a gap of 1/16 (1.6 mm) should exist between left side bevel gear case casting and stop bolt (Fig. 1). When the steering cylinder is fully retracted, a gap of 1/16 (1.6 mm) should exist between right side bevel gear case casting and stop bolt.
Rear Wheel Toe-in Adjustment
The rear wheels should have 0 to 1/8 of an inch toe-in when they are pointed straight ahead. To check toe-in, measure the center-to-center distance, at axle height, in front and rear of steering tires. If toe-in is not within specifications, an adjustment is required.
1. Rotate the steering wheel so the rear wheels and steering plate are straight ahead.
2. Loosen the jam nuts on both tie rods. Adjust both tie rods until center-to-center distance at front of rear wheels is 0 - 1/8 of an inch less than at the rear of the wheels (Fig. 9).
3. When toe-in is correct, tighten jam nuts against tie rods.
Here is the 328D the day I brought it home:
And after I aired up the left rear tire.
And the 325D so others can see the different axles and steering designs: