Having problems with 4x4 engagement. got 181k miles on truck. Changed the
4x4 actuator and harness 2-3 years ago at the shop. For same problem.
When putting the lever from 2wd to 4x4 hi or low 70% of time it will
engage. The other times it will not. The indicator light goes on but actual
engagement does not accrue. The indicator light flickers when accelerating.
This problem is most prevalent when OAT is cool @ 34 or lower. Some one
once said check the floor lever linkage as it might be gunked up???/
If you have a 88-98 full size, when the actuator was replaced, was it the new
style or was it replaced with the old style one? I have a 96 that had the same
Actuator went out while in the woods deer hunting, luckily had a winch to pull
out of there, but when it was replaced, they replaced it with the old style
problem again. It takes forever to engage, especially when it is colder out. I
the old ones have approx 3 - 5 year life, The new one "supposively" electric
you " Lock it In" it is suppose to be like RIGHT NOW. The old one glides through
some type of wax seal that when it is colder out it tends to make it harder to
get it to engage, the light will go on, but it truly isn't locked in. Hope this
there's nothing suppsed about it. the 98-up actuator uses a small
electric motor to push the plunger in and out. I have one in my '88
electric that when
yep, damn near instant.
The old one glides through
actually, the old actuator works by heating a small amount of gas,
which expands and pushes out the plunger. since it works be heat, the
colder it is out, the longer it takes to engage. the light shouldn't
engage unless the diff is actually engaged, as the switch for the
light is a seperate position switch in the axle. if the light comes
on and it's still not engaged, you've got 3 options: bad position
switch and bad actuator, a busted t-case, or a broken axle
26060073 is the GM part #. you'll have to talk to the parts dept at
the dealership for the correct adapter harness, as there are several.
btw... you can't get the old actuator from GM anymore, the new
actuator is the service replacement for it, except for some very
specific trucks in the early 90's.
Only problem is, if you're planning to do the replacement yourself and go to the
local parts store you'll have to ask which they carry, most will tell
you it's a dealer part, if so you will get the new one, but others do carry the
part and who knows how long they've been on the shelf. The local
Carquest carries them but are still the old style, so be sure to ask if your a
do it yourselfer.
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