4x4 disconnect - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 07-25-2009, 12:07 AM Thread Starter
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4x4 disconnect

Has anyone come up with a way to disconnect the front axle while having the transfer case in 4 low so you can back a heavy trailer up and turn sharp without getting all bound up.

1998 Dodge 3500 dually 4X4 with 5.9 12v. 5spd trans with 3.54 gears. Amsoil 6080 filter with outers,stock exhaust with no cat or muffler. Fuel plate full forward with AFC the same. Blocked wastegate and missing silencer ring
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post #2 of 11 (permalink) Old 07-25-2009, 01:27 AM
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there should be a way to put a switch on the vacuum solenoid or something for the front hubs.

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post #3 of 11 (permalink) Old 07-25-2009, 04:52 AM Thread Starter
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That was my original thought but will the solenoid stay in the 2 wheel position if you remove the vacumm and block the engaging side vacumm with a switch?

1998 Dodge 3500 dually 4X4 with 5.9 12v. 5spd trans with 3.54 gears. Amsoil 6080 filter with outers,stock exhaust with no cat or muffler. Fuel plate full forward with AFC the same. Blocked wastegate and missing silencer ring
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post #4 of 11 (permalink) Old 07-25-2009, 05:14 AM
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You can buy kits that do this, however I can't remember the price of them. I believe there are instructions on BD's website...so maybe you could use those for ideas/fabrication of your own?

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post #5 of 11 (permalink) Old 07-25-2009, 06:35 AM
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There is a manual cable for the axle spline sleeve for a couple hundred.

The hoses unplug from the vacuum motor. Hook the hoses togather.

There is a kit to replace the front wheel bearings with the old style spindles w/lock hubs. It costs just a little more than getting caught with a bad bearing on the side of the road.

keydl

93 Dodge /CTD, IC, 518, club cab LE, BHAF, KDP fixed, kelderman air ride
81 Isuzu /C223na, 5spd
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post #6 of 11 (permalink) Old 07-25-2009, 07:16 PM Thread Starter
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You can buy kits that do this, however I can't remember the price of them. I believe there are instructions on BD's website...so maybe you could use those for ideas/fabrication of your own?
Well I checked out the instructions for BD's kit and it looks like they are just shutting off the main vacumm supply to the front axle using a electric solenoid. Why couldn't a person just use an air swith on the main line and shut it of that way instead of installing another solenoid and wiring etc. Does anyone know what size the line is for the vacumm. Is it standard 1/8th synflex or something foreign?

1998 Dodge 3500 dually 4X4 with 5.9 12v. 5spd trans with 3.54 gears. Amsoil 6080 filter with outers,stock exhaust with no cat or muffler. Fuel plate full forward with AFC the same. Blocked wastegate and missing silencer ring
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post #7 of 11 (permalink) Old 07-26-2009, 01:51 AM
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The one that I put the cable on was 1/8 th tube with rubber tubing ends.

Arranging a vacuum switch to switch the tubes would do the trick. Or exchanging the tubes on the nipples for while you want the axle unconnected.

keydl

93 Dodge /CTD, IC, 518, club cab LE, BHAF, KDP fixed, kelderman air ride
81 Isuzu /C223na, 5spd
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post #8 of 11 (permalink) Old 07-26-2009, 10:25 PM
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isnt there a way to just not let power get to the vacuum solenoid or whatever when you put it in 4wd? thats how i have it on my ford.

Garrett






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post #9 of 11 (permalink) Old 07-27-2009, 03:13 AM
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The vacuum motor is powered either way. The shaft got sticky so he put a cable on - was arount $200.

Need to change 2-3 times a year in fair weather just reach under and change the vacuum lines or drop and plug the outboard line.

If it has a couple of hundred thousand miles on it and you want to do this regularly get the wheel bearing kit. And put a wedge on the shift box on the axle.

keydl

93 Dodge /CTD, IC, 518, club cab LE, BHAF, KDP fixed, kelderman air ride
81 Isuzu /C223na, 5spd
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post #10 of 11 (permalink) Old 07-30-2009, 12:34 AM Thread Starter
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Well got my disconnect hooked up today. Spliced into main vac line to transfer switch and ran to air switch under dash and back out to transfer case switch. Cost $21.00 for fittings and 5/32 line. I already had the air switch from a positive shutt off valve. The switch is tucked under the dash partway with a guard on it to prevent accidental tripping. Works like a charm and didn't cost a fortune. Maybe I should patent this and become rich

1998 Dodge 3500 dually 4X4 with 5.9 12v. 5spd trans with 3.54 gears. Amsoil 6080 filter with outers,stock exhaust with no cat or muffler. Fuel plate full forward with AFC the same. Blocked wastegate and missing silencer ring
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