4 wheel drive not working (Help)

[BWdiver]

here is what mine was.. i replaced the switch with no luck...so i bought this and now i have 4x4 again.. research your hoe and eliminate all other parts before you spend the money... just saying this was my problem......http://cgi.ebay.com/ebaymotors/ws/e...0235336807&viewitem=&sspagename=STRK:MEWAX:IT ... thats the link ... if it dont work here is the item #... 310235336807 this one is the cheapest i have found and its free shipping

Thanks niterunnr, Mine is engaging the actuator that you purchased just not when I want it to. with the 4x4 engageing with out my input and the switch light blinking erratically at different times I think the switch is toast.

Bud.

 

[raptorforme93]

The actuator is right in front of the diff. It's round and screws in. It's really hard to miss, to be honest.

I thought that was it but I wasnt just glancing around because I was underneith the hoe but was working on the exhaust and did have time to look at the 4x4. I was just making sure that was the right part. Thanks for the confirmation though!

 

[BWdiver]

Put the new switch in yesterday morning and all is well with the Hoe. So it wasn't the front diff Actuator.

 

[Chucktown Mako]

My '01 had a clank/click going on for a while, finally diagnosed as the T Case. Long story short, put a rebuilt t case in and it won't go into 4 low now. Transmission shop can't figure it out. They can shift it manually into 4 low, but not with the button. When you try it, it shifts about 3 times, then goes into 4 Hi.

Niterunnr: You just replaced the shift actuator and not the entire shift motor? I will run that by the trans shop.

 

[Diller]

3. So I go to the Hoe today and decided to try again and it engaged, got 4 wheel drive, light is lit solid.
decided to switch it again and nothing.
Later on I go back out and it worked flawlessly couldn't make it not work, GO FIGURE!!!

Bud.

Take it from a GM parts guy. The front axle actuator is a VERY COMMON problem on these trucks. I've sold HUNDREDS over the years.

Oh, and hello all. This is my first post!!


Diller
Hopefully picking up my '97 this weekend!!!!!

 

[j pop]

bad ground on 4 wheel drive

check the ground wire on body mount under drive side clean them

 

[SunlitComet]

check the ground wire on body mount under drive side clean them

Check the date on the last post before you post a response as it may be long dead issue by now. I mean it has been three years now since the OP said it was fixed.

 

[dntnvme]

Hello. This is my first time owning a 4 wheel drive vehicle. I just purchased a used 2002 Envoy and brought it in to be checked for this problem but they said they couldn't find a problem:duh: but it's still happening vehicletreat.

First of all, vehicle treat the dial is always set at 2 wheel drive. Then while slowing down or leaving a parking spot or going into a parking spot the light changes on its own to 4H drive. Can you imagine how hard it is to turn or how surprised I was when this first happened? Or I'm driving along and slowing down at a light and the 4H light is blinking, like it's trying to engage. The 2 wheel drive only goes to 4H, not to A4 or 4L when this happens. I haven't experienced this while driving at a steady speed. Any ideas out there?

Thank you Lisa(March)