Switch For 2WD Low Range

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Wiz-
Maybe I shouldn't offer advice (as I haven't hooked mine up yet), but have you tried blowing through the vacuum switch in both positions? This would be a simple test to see if your switch is at least toggling. You should be able to blow through it when your toggle switch is off, and then not be able to when the switch is on. If vacuum is "blocked" from the front axle prior to engaging 4WD LO, there is no way that the front axle can lock.

Also, you must flip the toggle switch first PRIOR to shifting into 4WD LO. Once the front axle is engaged, it might take a little bit of driving before it will disengage. I would be very careful about driving around with a floor jack under the rear.

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David Dressler
2001 Driftwood 3500 Quad Cab 4x4, 155 inch WB, 5. 9L HO Cummins Diesel (ETH), 6-Speed HD Manual (DEE), SLT+, 3. 54 Anti-Spin Axle, Camper Special Group, Trailer Tow Group, Leather, Sliding Rear Window, Jacob's E-Brake, Rhino Liner, VDO Vision (pyro, boost, engine oil temp. ), Weather Guard Diamond Plate Saddle Box, Tork Lift camper tie-downs, AND functional Halo light!
Bigfoot 3000 10. 11 Slide-in Camper.


[This message has been edited by dresslered (edited 09-21-2000). ]

 

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An easy quick check: Have someone (my wife did it for me) flip the switch on and off (w ignition on AUX). Stick your head under the hood near the solenoid valve. You should clearly hear it clicking on and off when the switch is toggled. If it ain't clicking it's either broken or is not getting power.

 

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I hooked up a 2low kit a couple of weeks ago. Simlple and works good. You have to turn on the 2 low switch before you shift the transfer case.

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98. 5 2500 QC LB 4x4 5spd, white. BFG 285x75x16
Cummins 24v w/ TST PowerMAX w/EGT and Boost gauges on A-Pillar. VanAaken CPC. K&N In the factory air box. Stock Injectors, Stock Exhaust (complete with rattling baffles in muffler). Re-routed breather stink tube, 2WD-low kit, SnugTop, JJ Stainless Running boards, Tow Hooks, Bushwacker Street Flares, and a Cup Smoothie.
70,000 miles (8/25/00)

 

[Archive]

Boy you guys are GOOD, you've covered all the faults that could happen, it just proves what a great information resource the TDR site is.

Anyway I was talking to the fella that designed the BD kit and he said that we've got all the areas covered. He also suggested that you take the Yellow marked vacuum hose off and check the brass fitting for a plugged restricted fitting hole. Sometimes in the manufacturing process the . 013 hole is plugged or not drilled through. If it is plugged just run a . 013 drill bit thru or a needle/paperclip is a good fix.

Let us know how it turns out.

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Real BOMBers never get speeding tickets. . just a lot of warnings!

 

[Archive]

You guys are great ! When I get home this morning, I'll give all your ideas a try. I will check out those fittings. As far as having the back end up on a jack, you only need to move a few inches to know that the front wheels are pulling, but thanks for the concern.

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2001 ordered 12/20/99. Arrived 2/9/00 2500 RC, SLT,4X4,ETH,6-speed,4:10 anti-spin,Camper special,cab clearance lights,GPD trailer tow mirrors,sliding rear window,Snow Plow prep, power seat,Line-X'd OTR bed and quarter panels,DeeZee running boards,INTENSE Blue/ agate.

[This message has been edited by Wiz (edited 09-22-2000). ]

 

[Archive]

Wiz-
I should have entered a smiley #ad
on the driving with the jack comment as I was joking. The point that I did want to stress, hoever, that once you have engaged the 4WD, you might have to drive your truck 100-ft or so before it will disengage again. Your 2WD switch might actually be working and you just didn't realize it. good luck,

 

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Has anyone actually seen or heard of where to get the three port vaccuum switch pictured in the TDR that Mike Monell has?... T

 

[Archive]

DD, TD, SKI BUM, and all,
Sorry for the long delay in posting results, but I was on vacation. I followed all your tips, and now 2-lo is working fine. I pulled the hoses,cleaned the barbs, rechecked all connections, and followed the correct engagement sequence. You MUST flip the switch PRIOR to shifting into 4-low.

Again. . Thanks guys for all the tips & suggestions!! Wiz

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2001 ordered 12/20/99. Arrived 2/9/00 2500 RC, SLT,4X4,ETH,6-speed,4:10 anti-spin,Camper special,cab clearance lights,GPD trailer tow mirrors,sliding rear window,Snow Plow prep, power seat,Line-X'd OTR bed and quarter panels,DeeZee running boards,INTENSE Blue/ agate.