Put a '72 D100 together & the only third member I have laying around at the moment is a 3.90 with a spool. I'm going to daily the thing for a while & it may be a month or so before I get it swapped. What's the chances of snapping an axle? I've got the tires pumped up to 40 psi so they don't hook up as good & hopefully spin easier & I try to make all my turns wide & take the straightest paths through parking lots. Got a line on a 3.55 open but it's going to need gone through.