Why is my 4wd not working? | Page 2 | Ford Explorer Forums

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Why is my 4wd not working?

DeRocha said:
Please clarify the new autohub install. Did you install 2 brand new autohubs along with new nylon engagement cams? Time for some more tape.. Put some tape on the axle shafts going into each wheel. This will let us know if the diff is working and rotating the shafts....

Note: As a safety feature you can only engage 4x4 low if your in neutral or park (and speed < 3mph). Low range will scream at speeds approaching 20mph...

The wiring diagram for the '91 shows the controller connected only to the neutral safety switch, not the brake switch. But with the speed sensor limiting engagement to a crawl, your going to be on the brake anyway. Don't know if that was changed in the '94.

Further diagnosis here: Alldata test procedure
 



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Hello All, Here's the scoup as of about 10 minutes ago. To answer the other question about my replacing the autohubs, they were off my friends ranger that he said worked last week when we had snow. Anyhow after spending about 3 hours on this sight last night, I desided to start from scratch.
The first thing I did this morning was test the module in the rear panel, I pushed the white button, the led lit for around 30 seconds and then went out, so that passed. I put the truck on stands, engaged the 4wd button and got nothing, no shaft movement. I removed the shift motor for cleaning and it looked like it was 50 years old (outside). I used a little PB blaster around all the screws that had to be removed (went for lunch), I returned to tear the motor apart, removed the back plate, the barrel and armature ok, next was the plate with the wires.
Luckily I had a set of security torx bits from when I change my MAF sensor, well all 3 screws broke off way to easy, oh well sh.. happens, I then called around and found a replacement motor at the local NAPA (parts) store, not bad either, only 135.00 and made by BorgWarner. Installed the new motor being sure the cam was pointing at 2wd (p.s. did not cut the speed sensor wires, to easy to pull red retainer out of plug). Anyhow got it all back together, now to test the system. Started the truck, engaged 4wd and yahoooo the shafts are now spinning ie; front drive shaft as well as 2 front wheel shafts. But the wheels never turned (with my old newly cleaned out hubs), Damm... removed the front tires as well as hubs to check the axle ends, and they were spinning. OK time to think a minute, I could by the NEW auto hubs from A1 on eBay for 195.00 each, or do the smart thing and listen to all you who have been where I am now. Well a trip back to NAPA, and I returned with the WARN manual hubs and the conversion kit. I think it took longer to drive to the parts store, then it did to do the conversion... about 20 minutes. Now if I lie under the truck (no longer have all 4 wheels off the ground) , I can turn the front drive shaft by hand, and the wheels turn in whichever direction I turn the shaft. SUCCESS!!!!!!!!
But I do have one more concern. Before I changed the hubs, and the front shafts were spinning ( did not have my foot on the gas, so the axles were only spinning at basically idle speed, taching around 600rpms ) I could grab the shaft with my hand and stop it, I went to the other side, and it too I could stop with my hand, has this got to do with the open end theory, or should I have not been able to stop these shafts by hand. I would have thought they would have much more force than that. Does the front transaxle have a ring and pinion like the rear, I just want to make sure that the front transaxle is working properly, also it has plenty of fluid in it.
Sorry to be so long in this description, but it's better to give more info, so you guys don't have to keep asking for more info.
I can see the light at the end of the tunnel, thanks for all the great advice.
You guys really know you stuff.
P.S I put the truck in neutral and with my foot on the brake, it shifted into low ( plus the light lit) with no problems.
 






JOHN BUFF said:
...But I do have one more concern. Before I changed the hubs, and the front shafts were spinning ( did not have my foot on the gas, so the axles were only spinning at basically idle speed, taching around 600rpms ) I could grab the shaft with my hand and stop it, I went to the other side, and it too I could stop with my hand, has this got to do with the open end theory, or should I have not been able to stop these shafts by hand. I would have thought they would have much more force than that. Does the front transaxle have a ring and pinion like the rear, I just want to make sure that the front transaxle is working properly, also it has plenty of fluid in it...
That's what happens with an open differential.
Front differential is, in principle, just like the rear. Ring and pinion with a carrier and spider gears and all that stuff. Parts aren't interchangeable or anything like that, but they operate on the same principle.
 






Hello, so it was normal that I could stop the shafts by hand, and I can relax now..... Would like to know everything is going to work when I need it, although I may find a dirt area tomorrow to test it.
Thank you
 






Glad to hear everything is working. The front Dana 35 axle has a ring and pinion like the rear. And Yes... with an open diff the wheel with the least resistance will be getting all the power.. That is why you could stop one wheel from spinning... But to put you mind at ease you could NOT stop both wheels... One will always bee moving...If you were to hold one axle with a tiny 5 lbs of force the other wheel would move. If your buddy tried to stop the other wheel he would need to apply 5+ lbs of force at which time your wheel would begin to move...

$135 for a shift motor is a good deal... How much were the Manual hubs and conv kit if you don't mind me asking?
 






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