some have set screws and some just press on.
You should have a 1" axle front and rear.
harley sportster front axle torque specs
It should be one inch.
60 - 65 ft/lbs
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1 inch.
Thunderbirds never had a front axle
A 1994 Ram 1500 has a Dana44 front axle. A 2500/3500 has a Dana60 front axle.
It's a softail with a springer front end installed. The springer front end has an extra spring loaded/shock assisted shaft that the axle mounts to for the front wheel's suspension. Some people add springer front ends to other models as well.
The maximum weight the front axle is designed to carry.
1 inch