if i want to drop my driveshaft on my front to make a 2 wheel drive on my 2002 gmc envoy is that all i have to do it is a 4wd
Why would you want to do such a thing? If your thinking it will give you better mileage it won't. Just leave the button the 2WD mode and you have the same thing, but if you don't use the 4WD at least once a month you run the risk of loss of lubrication in the front differential not to mention moisture build up, and the transfer case shift motor can become stuck as well, all leading to more expense down the road.
Are you saying I should drive my Envoy in 4 WD just a short didtance to keep it working? I had it about 8 month and never used it but one time when I first got it, just to see if it worked.
Yes, I take my Yukon every month to a dirt road and engage the 4WD, first the 4 WD HI then into 4WD LO, only takes a half a mile in HI and a quarter mile in LO to keep things all lubed up so if I need 4X4 it is there and fully operational. I do not run my 4X4 on hard pavement unless it is raining buckets or there is snow covering the roads. HTH
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