4WD update + GEM + Chip
Thread Starter
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Senior User
Joined: Mar 2004
Posts: 137
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4WD update + GEM + Chip
My F350 won't shift into 4wd, and after changing out the transfer shift motor with no luck, I took it to the shop.
They found that the owner before me did some "creative wiring" to the 4wd system, and that he had a chip hooked up.
I found that the previous owner had replaced the auto-locking hubs with warn manual hubs, and disconnected the vacuum to the hubs.
He also added some wiring to the dash 4wd switch, but we can't figure out what the extra wires to the dash 4wd switch were for.
The shop figured the chip, along with the wiring changes probably blew the GEM Module.
I knew there was a chip, because a hypertech came with the truck, and I used it once to put the truck back to stock, so I may have blown the GEM doing that!
I am going to try disconnecting the batteries for a few hours to see if the GEM cleans itself out.
Anyone else ever have this problem, could it be that the GEM just needs to be reprogrammed?
Any other suggestions?
They found that the owner before me did some "creative wiring" to the 4wd system, and that he had a chip hooked up.
I found that the previous owner had replaced the auto-locking hubs with warn manual hubs, and disconnected the vacuum to the hubs.
He also added some wiring to the dash 4wd switch, but we can't figure out what the extra wires to the dash 4wd switch were for.
The shop figured the chip, along with the wiring changes probably blew the GEM Module.
I knew there was a chip, because a hypertech came with the truck, and I used it once to put the truck back to stock, so I may have blown the GEM doing that!
I am going to try disconnecting the batteries for a few hours to see if the GEM cleans itself out.
Anyone else ever have this problem, could it be that the GEM just needs to be reprogrammed?
Any other suggestions?
Elder User
Joined: Sep 2004
Posts: 851
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From: N. Georgia
Don't know about the GEM, but the switch was probably to have 2WD low. You should see the wires I have run through mine for different things I've added. I'm glad you've got the fix narrowed down.
Joe
Joe
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Senior User
Joined: Mar 2004
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Don't know about the GEM, but the switch was probably to have 2WD low.
There are two additional wires tapping into two of the four wires in the dash switch, but I personally can't figure how they could change the 2wd system.
How can adding extra wires to a Dash switch, make it 2 low, when the switch only indents to 2wd, 4 hi, and 4 low?
Senior User
Joined: Feb 2004
Posts: 220
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From: Sebring, FL
Maybe the extra wires are for a locker (like an air locker or something and didnt want an extra swith on the dash).You can look at the diffs and see if there is a wire or air hose going to it. Thats what a friend of mine did. Just a thought
Freshman User
Joined: Jul 2008
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I am very interested in putting in a 2wd low switch in my 2002 7.3L auto. Can you give me some details on how you did this.
Cheers Rod.
Cheers Rod.
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From: horicon Wi
the best way to do this is to upfit warn selectable hubs on your truck and when ever you want 2Low just shift into 4Low and do not lock the hubs that IMO would be the best solution so if down the road you want the convinience of shift on the fly you can put your stock hubs back on
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Logistics Pro
Joined: Jun 2005
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From: AZ
...) Just pull that transfer case lever to 4WD Low without locking your front hubs...presto 2WD Low! If you have ESOF transfer case, I have no idea.
Cargo Master
Joined: Jan 2001
Posts: 2,726
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From: Slatington, PA
the best way to do this is to upfit warn selectable hubs on your truck and when ever you want 2Low just shift into 4Low and do not lock the hubs that IMO would be the best solution so if down the road you want the convinience of shift on the fly you can put your stock hubs back on
Postmaster
Joined: May 2008
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From: horicon Wi
imo the best way to get 2Low would be what i described in my last post you could jerryrig it but the other way is better
Post Fiend
Joined: Oct 2004
Posts: 10,418
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From: SpringHill,Fl
why would you say adding a switch inline is jerryrigging? it should have been a factory option!
it sounds like a damn fine idea to me, and is a whole lot cheaper than manual hubs!
and if you go to sell the truck is easily reversible and no extra parts to store or sell...
it sounds like a damn fine idea to me, and is a whole lot cheaper than manual hubs!
and if you go to sell the truck is easily reversible and no extra parts to store or sell...
