Yeah it's a lack in vacuum. Have you done any diagnostics?
This is my findings from oem actuators. Even if u plug the vent and vacuum port with your finger the diaphram itself still lets air In and out. The material they use for a diaphram is crap. It let's moisture inside and there's a collar spring inside which with any corrosion or grime will lock up causing troubles in engaging and disengaging. What you are describing is either loss of vacuum or not enough. Check your solenoids. Get a vacuum test gun and check if any vacuum gets released. The hoses are brittle rubber. One time it was -50c and as soon as I touched the rubber hose it snapped like plastic....
Something is causing your iwe solenoid to not engage/disengage or it's just stuck in the middle. Check your cv splines and hub splines for any wear and tear. I also like to grease the hell out of those parts with extra wheel bearing grease to keep gunk out and have everything going smoothly. It's a very common issue with this vacuum actuated design.
Here's a video of what I am trying to achieve. Dunno if you have seen it. They show some parts used.
m.youtube.com/watch?v=gTNxmTkOOxs
I run rcv axles for half shafts and spidertrax hub unit bearings.
If you have any more questions shoot or send me a pm with your issue I'll try to help you
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---------- Post added at 10:40 PM ---------- Previous post was at 10:38 PM ----------
Yes you can run a dynatrac pro 60 IFS. That's just a housing.
You have pop In a different differential altogether in a ford 8.8 reverse. Like a Detroit 2trac . Just watch out. I stuck a front Locker in mine but it spools 10 times more causing troubles on cv shafts /hub assemblies.
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