Outer Limits 4x4 Board

Gday all,
A friend of mine has a sierra, when she puts it into 4x4, the light comes on but no power is applied to the front diff....Has anyone had this problem before?

I am only fairly new to the 4x4 side of things, but would this most likely be the transfer case???


Cheers
John

if the tailshaft doesn't spin its the transfer case, if it does its either the diff or hubs
have fun

It's most likely to be the hubs not engaging. Sierra transfer cases are pretty reliable- if the lever moves cleanly into the 4WD position, there's unlikely to be anything wrong with the case. (or diff - mostly they are rusty from never having been in 4WD - certainly not broken)

hubs, though, will seize up from under use/ no maintenance, or fail to engage due to faulty reassembly after service. It's not always possible to tell that the problem is in the hub because it still feels like it moves properly from free to lock.

99% it's the hubs.

Steve.

thanks guys, very helpful

one more question, does it need new hubs then? or just take the old ones off and clean em up a bit???

just pull the 6 bolts off and run a light finger of grease around the slider. will be good as new

spring inside has probably snapped. You cant buy this part new i dont think, so get a secondhand one. It will only be one but grease the other side aswell.

are u locking the hubs in

haha yes i asked her that and she said she was

Gwagensteve wrote:or fail to engage due to faulty reassembly after service.

its amazing how many qualified mechanics cant do something as simple as reassemble manual locking hubs properly, 3 of my mates have had this problem after having there wheel bearings replaced

thanks guys, have pointed her in the right direction (hopefully)....see how she goes