#2456718 - 09/25/08 05:02 AM
Posi-lok (NOT posi-trac)
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Rock Chuck
Campfire Guide
Registered: 01/05/06
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This is the manual conversion to eliminate the vacuum or electric switch that locks the front axle on many 4x4 vehicles. It uses a cable running from the cab to the axle and locks the sides together without relying on that lousy switch.
Has anyone tried one? The switch is out on my Chev truck. A new switch costs about $150 and the Posi-lock is $200. The electric switch has always been a real pain because there's a long delay between shifting to 4x4 and when it actally locks up. I'm thinking of going to one of these things instead of replacing the switch.
POSI-LOK
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#2457989 - 09/25/08 07:26 PM
Re: Posi-lok (NOT posi-trac)
[Re: Rock Chuck]
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mud_bogger
Campfire Guide
Registered: 03/02/07
Posts: 3183
Loc: Medford Oregon
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I dont have any experience with it personally. Had 2 buddys install them though. One in a S-10 an the other in a Ram 2500. Both seemd to like it.
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#2458252 - 09/25/08 09:37 PM
Re: Posi-lok (NOT posi-trac)
[Re: mud_bogger]
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Rock Chuck
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I ordered one this afternoon. Even if it's only so-so, it'll be far better than the stock contraption. The 10 to 30 sec. delay in the lockup is a good way to get really stuck sometimes. Then it would unlock when I turned the key off. What a pain. I'll be glad to get rid of it. I don't know why GM couldn't come up with a simple solinoid. It would work much better than this heat thing and not have the delay.
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#2459636 - 09/26/08 03:35 PM
Re: Posi-lok (NOT posi-trac)
[Re: Rock Chuck]
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free_miner
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Registered: 12/10/04
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they work well, i've replaced a couple GM thermal actuators with them. As an added advantage, you can use low range 2wd when you are backing trailers or similar, and not have the fron/rear tires fighting each other.
98 and newer GM's have a motor/screw type actuator that are much better, you can retro-fit pre-98's with a bit of wiring changes.
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#2459832 - 09/26/08 05:11 PM
Re: Posi-lok (NOT posi-trac)
[Re: free_miner]
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mud_bogger
Campfire Guide
Registered: 03/02/07
Posts: 3183
Loc: Medford Oregon
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Did you order a shift fork as well? Seems that when I was looking into them, they recomended replacing the shift fork when you installed the posi-lok.
Granted it was one for a jeep cherokee(d30) and my memory isnt the best. Might be worth looking into though.
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#2462461 - 09/28/08 06:49 AM
Re: Posi-lok (NOT posi-trac)
[Re: mud_bogger]
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Rock Chuck
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Registered: 01/05/06
Posts: 4713
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there is no shift fork on GM's. It's an internal sleeve that slides sideways. To change one of those requires a differential overhaul. The instuctions tell how to check to see if it's damaged before installing the posi-lok (mine is good).
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#2466525 - 09/29/08 10:52 PM
Re: Posi-lok (NOT posi-trac)
[Re: Rock Chuck]
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Swift
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Registered: 05/24/01
Posts: 852
Loc: PA
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The 10 to 30 sec. delay in the lockup is a good way to get really stuck sometimes.
You should be recognizing or anticipating situations earlier and not rely on lockup when it's there.
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220 Swift still king.
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#2466829 - 09/30/08 05:53 AM
Re: Posi-lok (NOT posi-trac)
[Re: Swift]
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mud_bogger
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Registered: 03/02/07
Posts: 3183
Loc: Medford Oregon
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surprises happen more than you would think.
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#2467380 - 09/30/08 10:10 AM
Re: Posi-lok (NOT posi-trac)
[Re: mud_bogger]
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EZEARL
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Registered: 01/02/08
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Hey,mud bogger. Were you having trouble with the front axle disconnect unit in your Cherokee?
til later
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#2467902 - 09/30/08 03:02 PM
Re: Posi-lok (NOT posi-trac)
[Re: EZEARL]
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mud_bogger
Campfire Guide
Registered: 03/02/07
Posts: 3183
Loc: Medford Oregon
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Yea it was boogering up, as was most the jeep.
Bout 75% of it wasnt the jeeps fault. It took me alot of tough to get to places. But I also learned the hard lesson about off road thrashing a daily driver
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#2470483 - 10/01/08 03:08 PM
Re: Posi-lok (NOT posi-trac)
[Re: Swift]
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Rock Chuck
Campfire Guide
Registered: 01/05/06
Posts: 4713
Loc: Filer, ID
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The 10 to 30 sec. delay in the lockup is a good way to get really stuck sometimes. You should be recognizing or anticipating situations earlier and not rely on lockup when it's there.
Easy to say when you aren't the one to find the wet spot on the road has suddenly changed to a foot of mud. Or the 1/2" of snow on the road is covering a lake of glare ice.
The OEM switch also disengages the axle when the ignition is off. You can't leave it locked in so you have to hope it locks after you start the engine. If the axles shafts aren't aligned, it sometimes doesn't happen. Sometimes the lock light comes on immediately because the locking sleeve is in a bind and hasn't disengaged. The switch, however, IS disengaged. As soon as you move an inch, the sleeve shifts to unlock it, just when you need it to get moving.
The OEM switch was designed by a committee of idiots. All they needed was a simple electric solenoid. But no, they come up with this heat actived monstrosity. No wonder GM is having problems.
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Keep guns out of the wrong hands...a criminal in prison doesn't have a gun
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#2472590 - 10/02/08 11:55 AM
Re: Posi-lok (NOT posi-trac)
[Re: Rock Chuck]
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Rock Chuck
Campfire Guide
Registered: 01/05/06
Posts: 4713
Loc: Filer, ID
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I have it installed except for running the cable through the firewall & adjusting it. I'll do that tonight. For what it is, they're definitely overpriced. There isn't $75 worth of stuff in the $200 box. If I didn't need to replace the switch, it wouldn't be worth the money. Now that I see what it is, I think it wouldn't be to hard to make one with a manual throttle cable.
The instructions said to drain the differential. I don't know why. If you jack up the right wheel, the oil won't run out the hole. I needed to change the oil anyway so nothing was lost but I'd be po'd if I did that for nothing.
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Keep guns out of the wrong hands...a criminal in prison doesn't have a gun
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#2474224 - 10/03/08 05:27 AM
Re: Posi-lok (NOT posi-trac)
[Re: Rock Chuck]
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Rock Chuck
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Registered: 01/05/06
Posts: 4713
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In case you ever have a need for one of these:
I've got it installed and it works great. I shift the transfer case, and then use the dash button to shift in and out of 4x4 as needed. Very simple, no delay.
The directions are a little vague but if you can do this job at all, you can figure them out. It's not a complicated job at all. It can be done in a couple of hours but I changed the diff oil while I was at it so it took longer.
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