1985 Blazer S-10 questions 4x4 not engaging
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1985 Blazer S-10 questions 4x4 not engaging - 7/18/2005 9:24:36 AM
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I8URVTEC
Posts: 10
Joined: 7/18/2005
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I just bought a 1985 Blazer S-10 that has only 62k original miles on it but has been sitting for quite a few years. The only real problems that I am having with it are that the windsheild wipers don't work and that I can't engage the 4 wheel drive. With the wipers I think it is the switch b/c when I put the wipers on the wiper fluid comes out and the higher I put the wipers on the more the fluid comes out. The problem with the 4 wheel drive is more confusing. when I engage the 4WD high or low you can hear a difference in the gearing but the front wheels do nothing. If I get stuck and put it in 4WD just the back wheels spin. Any suggestions? Thanks.
< Message edited by I8URVTEC -- 7/19/2005 10:30:36 AM >
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Forum for all year Mustangs
My cars:
2005 Mustang GT
1991 Mustang 5.0l LX
1985 Blazer S-10
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RE: 1985 Blazer S-10 questions - 7/18/2005 1:45:34 PM
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DED
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Joined: 7/14/2005
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I had an 89 S10 Blazer that had the same 4X4 problem. My had sat for a while before I bought it too. For me it was a vaccuum line. One vaccuum line had a crack in it, you could here it engage but no power to the front wheels. I would check for vaccuum leaks first. You might what to check the hubs out too. If it was sitting they probably need to be lubed.
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RE: 1985 Blazer S-10 questions - 7/18/2005 2:26:39 PM
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I8URVTEC
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Joined: 7/18/2005
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This is my first 4x4 vehicle so I am new to some of this stuff. How do I check the hubs?
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RE: 1985 Blazer S-10 questions - 7/19/2005 6:00:26 PM
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DED
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Joined: 7/14/2005
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What size motor do you have, and is your truck Auto or manual transmission.
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RE: 1985 Blazer S-10 questions - 7/20/2005 9:04:14 AM
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I8URVTEC
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It's a V-6 with a manual trans.
_____________________________
http://www.FranksPerformance.com/
Forum for all year Mustangs
My cars:
2005 Mustang GT
1991 Mustang 5.0l LX
1985 Blazer S-10
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RE: 1985 Blazer S-10 questions 4x4 not engaging - 7/25/2005 11:10:01 AM
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Hanr3
Wheels & Tire Moderator
Posts: 3482
Joined: 5/11/2005
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More then likely you fixed the problem, maybe?
Based on the pics the hose you attached goes to the vacuum actuator for the front diff. You have it correct.
The other hose (?) has a filter on it and is a breather hose that goes to your transfer case. It runs up into the engine compartment so that when you drive through water, the water doesn't get sucked into the t-case and destroy it. Both axles should also have breather hoses on them as well. Crawl under the truck and find them, see where they go. I ran my rear diff breather hose all the way up to the engine compartment as well. I also ran a hose from my 700R4 auto tranny to the engine compartment. I take my '87 S10-Blazer 4 wheeling all the time. So having those hoses in the engine compartment helps to keep water and mud from detroying my axles, tranny, and t-case.
I wrote that you might have fixed the problem. The vacuum system is prone to failing for various reasons, so hooking the hose up might have fixed it. Then again it might not and replacing the factory vacuum set up isn't worth the money. There is an easy permanent aftermarket fix. Buy a Pos-Lok kit and install it. http://www.4x4posi-lok.com/app_chevy-s.html
Costs like $100 and eliminates the vacuum system. It works via a mechanical cable you pull from in the cab of the truck. I made a home made version that cost me $30. If you look at the vacuum disconnect (where you attached the hose) it has a cable that runs down to the front diff. All you need to do is install a cable that runs back into the cab of the truck, thus eliminating the vacuum system. That is what I did. My Posi-Lok works different then the kit on the Posi-Lok website. Take a look at mine and theres and you should see the difference.
http://offroadworld.tenmagazines.com/mygallery.ten-id-4266-album-10757
I addeed info to each picture, however to see it you need to see the picture in fullsize.
The hubs on the s-series trucks a permenately sealed "locked" units, and they do not "lock" or "unlock" like other 4x4 trucks. There is no maintenance to the s-series hubs. The front axle is "locked in" via the vacuum when the t-case is engaged. With the Posi-Lok upgrade you have to engage the t-case and then engage the front axle. This can be done from insdie the cab of the truck. While on other 4x4s the front axle has to be engaged by the hubs, someone has to get out and do it, and that might be in the middle of a puddle or mud hole. 
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
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'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: 1985 Blazer S-10 questions 4x4 not engaging - 7/25/2005 3:10:54 PM
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I8URVTEC
Posts: 10
Joined: 7/18/2005
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Thanks for the info. I checked out all the pics and everything. Here are a few follow up questions:
1) Is it possible before going through and installing a line to first test it by physically pulling on the line where the vacuum is now while the truck is stopped to sort of manually put it in 4x4?
2) Right now the truck has 4x4 high and low. With this direct connection do you still have the high and low?
Thanks.
_____________________________
http://www.FranksPerformance.com/
Forum for all year Mustangs
My cars:
2005 Mustang GT
1991 Mustang 5.0l LX
1985 Blazer S-10
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