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Old 01-22-2004, 05:46 PM
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how to tell if my 4 wheel drive works

I have never driven 4 wheel drive before. I have a 91 blazer for the winter. How can I tell if my 4 wheel drive is engagine when I shift from 2 wheel to 4? it will shift in, but I don't really notice a difference.

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Old 01-22-2004, 05:52 PM
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lol I dont really know a way.. you say its the winter so personaly I would spin the tires and look, or when you turn while accelarating it should feel a bit diffrent... (usraly an understeer feeling)
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Old 01-22-2004, 07:44 PM
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If you can find a dry patch of pavement in a parking lot this time of year, put the transfer case in 4 high and turn the wheels all the way in either direction, let off the brake and only apply the gas enough to make the vehicle move.

You should feel the "binding" in the drivetrain and this will give you the definitive answer of whether it's in or not.
You will feel the "bucking bronco effect".

You didn't say whether it is the full size or S-series Blazer.
If it's the S-series and you don't feel the binding, the vacuum actuated front axle disconnect may not be operating.
That would be what that black plastic ball next to the battery is for, the vacuum hose could crack or in most of the cases I've seen, just fell off.
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Old 01-23-2004, 06:31 AM
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For the impaired, remove the rear drive shaft and take a spin.

Trees
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Old 01-23-2004, 06:59 AM
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I have an older Blazer (83). In 4 wheel, there is a definite whining noise, but maybe that because its old. All my 4X4s have whined in 4 wheel.
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Old 01-23-2004, 07:30 AM
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I just gut a bronco 2 and how i found out was during a snow storm,head up a hill on wich you will spin if you hit the gas harder, put it in 4 wheel and it should feel like dry pavement.
by the way, do you have auto locking hubs, or is there a turn lever in the center of the front wheel. if so, leave it in neutral (park) and turn these hub locks all the way opposite where they are now,then put it in 4wd .
If this doesn't work it may be a vacuum leak.
p.s. If the hubs are locked the front end will knuckle on tight turns, wether or not the vehicle is in 4wd.mike
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Old 01-23-2004, 08:02 AM
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4 wheel low works fine but not 4 high aparently
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Old 01-24-2004, 04:57 PM
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I have a blazer that i was having problems with getting it to work in 4 wheel drive too. the 4 low always made a whining noise butt that didn't mean it worked. I fixed it by just simply hooking up the vacum hose. That is one of the best digging 4x4 I've ever driven now.
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Old 01-25-2004, 01:25 AM
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checking for four wheel engagement

If you want to check if the four wheel drive works, find a nice size tree out in the grass or woods and chain your bumper to it, then strand on it. you should be able to tell. Especialy now in the winter You do have snow up there AY!
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Old 01-25-2004, 06:24 AM
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Question

Why not just put the thing on stands and operate the different drives? Give you a good reason to check the drivetrain and grease it also...
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Old 01-25-2004, 04:26 PM
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Checking four wheel lock

You could put it on jack stands, but I think it is more fun to through some mud, arrrrrrr arrrrrrr arrrrrrr! Sorry, I'm having a flach back to puberty.


Trapper
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Old 01-26-2004, 02:17 AM
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When you put it in 4x4 did you drive it after? There's a big diff in feeling from 2 wheel to 4 wheel drive, if you cant tell the difference in a couple of minutes of driving its not working. Just to be sure try this, take it on gravel and put it in 4 and floor it, if 4 wheel drive is working I guarantee it wont spin the tires(providing its a stock motor).
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Old 01-27-2004, 05:49 AM
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chevy thunder 2

If you can't spin your tires on gravel while in four wheel lock, you better do a compresion check on your sled because I think you lost a few cylinders!!!!!!!!!!
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Old 01-28-2004, 07:40 AM
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up on jacks

Quote:
Originally posted by KULTULZ
Why not just put the thing on stands and operate the different drives? Give you a good reason to check the drivetrain and grease it also...
If you do use stands to check your four lock you should make sure that you have the suspention( loaded ). GM is known for their bad drive shafts. with the shaft loaded the splines inside the drive shaft with be pullingin the same place as if it is sitting on the ground. if you suspend the suspention the drivshaft will lengthing giving the inner shaft better spine teeth to grab. That is why I prefer to chain it to a tree or even back into a steap ditch and turn the pony's lose. That way if the shaft is bad you will hear it grinding. I have changed my front shaft twice since I bought the truck back in 1983. I use it for plowing snow and must have good 4x4 pull.

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Old 01-30-2004, 01:38 PM
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Re: chevy thunder 2

Quote:
Originally posted by trapper Ron
If you can't spin your tires on gravel while in four wheel lock, you better do a compresion check on your sled because I think you lost a few cylinders!!!!!!!!!!
No...are 98chevy won't, my friends 93 won't and I bet my 98 has more power than a 91 unless it got motor work. If it ever does break loose its only for like a foot or so and if you lock it in four low you might get a chirp on pavment. BELIVE ME I'VE TRYED IT!

Last edited by Chevy Thunder2; 01-30-2004 at 01:48 PM.
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