My 4 wheel drive stopped working


Asked by Jul 15, 2014 at 08:42 AM about the 1990 GMC Sierra 2500

Question type: Maintenance & Repair

After struggling with the 4 wheel drive it stopped working. The last two winters the 4 wheel got cranky. If you shifted it in and out of gear it would engage, sometimes in low sometimes in high, now it doesn't engage at all. It is a floor shift so I would think it is mechanical, but the light doesn't come on either. I use the truck for field work so getting it to a shop is not a good option. I checked the fuse it is ok,,,out of Ideas is there an electrical connection?

2 Answers


There is an actuator on the front axle housing that has a tendency to fail, that is what I would check out. Mechanical selector should not just randomly select 4WD lo or high as there is a detent pattern it should follow, there could be a problem developing in the transfer case, most likely it will need an overhaul.

1 out of 1 people think this is helpful.

I ment to say sometimes the low works and sometimes the high works the low worked the best. I crawled under and saw 3 wires I think they might be for the actuator, will check those connections first

Your Answer

Add photo

Related Questions

Search GMC Sierra 2500 Questions

GMC Sierra 2500 Experts

#1 Rowefast
Reputation 150
#2 FordNut
Reputation 100
#3 tennisshoes
Reputation 70
View All

Related Models For Sale

Used GMC Sierra 1500"
1,024 Great Deals out of 56,926 listings starting at $2,300
Used Ford F-250"
609 listings starting at $3,995
Used Ford F-150"
3,267 Great Deals out of 216,697 listings starting at $1,500
Used Chevrolet C/K 2500"
287 listings starting at $1,995
Used GMC Sierra 3500"
10 Great Deals out of 302 listings starting at $5,495

Used Cars For Sale

2004 GMC Sierra 2500 For Sale
48 listings starting at $9,500
2001 GMC Sierra 2500 For Sale
8 listings starting at $4,950
2000 GMC Sierra 2500 For Sale
34 listings starting at $5,414