Clamping front of leafs as good as traction bars??

Mopars don't use traction bars.
The axle is mounted 1/3 the way back on the springs as oppossed to the 1/2 back on GM and Fords.
That way when the front of the axle tries to rotate upward on acceleration, it has a lot less leaverage on the spring.
And the snubber can limit the travel on the diff snout.

Back in my day, if somebody was seen with traction bars on a Mopar, they got laughed at.