4 wheel Drive [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: 4 wheel Drive


chipper
01-29-2005, 04:24 PM
When I come off the dirt in 4 wheel drive onto asphalt road & shift into 2 wheel drive, lately it takes about a Qtr+ mile to shift. Any ideas what or why? :(

chipper
01-31-2005, 04:27 PM
Am I the only one to have this problem?? :(

Cobra#3747
01-31-2005, 04:43 PM
is that backing off the throttle or staying on the throttle?

chipper
01-31-2005, 10:48 PM
Cobra, I have tried it both ways, doesn't seem to make any difference.

ockgator
02-01-2005, 12:34 AM
put it in 2wd before hitting pavement, probably binding driveline a bit, especially true if you turn a bit on hard pack in 4wd. Does strg whl lurch when turning?, if so then driveline is binding up

Cobra#3747
02-01-2005, 08:07 AM
You have electronic shift? What makes you think that it is staying engaged? Or does it seem like the transfercase is shifting, but the front diff is staying engaged?

Lawnboy
02-01-2005, 09:34 AM
Chipper,

It's taking a long while for your TRANSMISSION or TRANSFER-CASE to shift?

You didn't specify which.

But....if you maintain gear bind, it'll take longer to shift OUT of 4WD

chipper
02-01-2005, 01:11 PM
Cobra, I can hear the front diff, it has a slight whine & it is electronic shift.

Lawnboy
02-01-2005, 01:43 PM
.......:help2:

Tip of the Iceberg
02-01-2005, 05:04 PM
Chipper:

Assuming all is working well with the shifting mechanism's (and I think it is), what your going through is common to all 4 WD's. The guys posting above have said it. If you think of the transfer case as a transmission without a clutch, you will have better luck in figuring out how and when you shift into and out of 4WD. You might notice that it will resist shifting INTO 4WD if your going up a grade....same thing. 4 WD's have no differential between the front and rear axles so pressures develop and will they will bind. This binding is the result of the pressures and those pressures resist the transfer case gears engaging or disengaging when in 4WD. As oskgator said, when you see hard surface ahead of you and you know your gonna take it out of 4WD, do it while still on the soft surface.....the soft surface allows the tires to slip....no pressure is built...ergo the shift is faster and easier. You can't always do this.....going up a hill for instance might still cause the pressures, but it's a good practice. Never-the-less if/when you find yourself on hard surface, the pressures will have to be relieved for the shift out of 4WD to be accomplished. This is where letting up on the throttle will relieve the presures or if your going slow already...speeding up and then backing off. There are times when even this doesn't seem to work and you will just have to wait until the natural occurances of the road and your driving relieves the pressures and the shift completes. Always picture in the back of your mind what pressures might be on the drive train and how you can relieve that pressure when shifting into or out of 4WD and it will work better for you. By the way, these pressure are not the kind that are necessarily gonna snap axles and cause damage; they just resist the shifting. On the manual Xfer case levers this is more evident since you can actually feel the resistance and you can feel the pressure relief with your hand as you try these things out.
Okay....I just re-read the last sentence and I'm gonna leave it as it is....so you guys with the dirty minds go ahead and start flaming:lol:

Cobra#3747
02-01-2005, 05:12 PM
First thing I would do is change the fluid, might be a little grit in there holding the colar gear in place and not allowing it to slide. If that dosnt work, not sure how much work you do on your truck, but if you feel up to it, take the passanger side axle tube out. There is a spring in there that is supposed to aid the gear in the dissengage. I have seen this spring broken and or weak before, not putting enough pressure on for a quick dissengage.