I can actuate the E-lockers at any speed on mine if I want to. I try to look ahead and see if I need one or both lockers and try to engage them before making a turn. That will help the rear locker to engage. The front locks easily.
When I'm in a sticky situation and need the locker I engage it and very slowly create a little wheelspin. Trying to use as little power possible to help engage the locker. When locked I don't mind giving it hell..
Engaging the locker with a heavy load on them is a very bad idea.
Speed shouldn't matter, whether you're doing 5mph or 50mph, the locking collar and the side gear spin at practically the same speed. I reckon it's just a safety feature.
- '65 112" Series IIa
3B diesel,TD04 turbo, Saab intercooler, H41 4speed, 4:1 Orion, SOA HDJ80 axles, HellFire Fabworks high-steer, PAS, dual E-locked, rear springs up front, 63" chevy rear springs, 5125 14"Bilsteins, 4door no-top/softtop, OBA, custom dash, custom 120ltr alloy fueltank and a few more things...