LB7: 4x4 issue.

jacobdewey

This won't last long...
Jan 14, 2011
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How did you do that?

What made you think the 4wd didn't work in the first place?

I went to use my 4wd and it didn't work when I needed it.

I just used the handle of my ratchet and pushed it in. The fork should automatically disengage when you let the pressure off of it.
 

ACiFiC

New member
Oct 14, 2012
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Canada
If you hold the driver's side tire and spin the drive shaft, does the passenger's side tire turn?

Yes it does!




I went to use my 4wd and it didn't work when I needed it.

I just used the handle of my ratchet and pushed it in. The fork should automatically disengage when you let the pressure off of it.

Did you give it a good smack or something? I pressed it with my finger a couple times when I took the sensor off
 

jacobdewey

This won't last long...
Jan 14, 2011
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You could have a bad shift fork inside the transfer case. they are known to have wear issues.

Not really a smack, but a few taps and it came loose. It was just sticky enough that the actuator couldn't push it in. I also changed the oil at that time and put in 75-90 synthetic.
 

ACiFiC

New member
Oct 14, 2012
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Canada
You could have a bad shift fork inside the transfer case. they are known to have wear issues.

How can I confirm I need said fork?


Not really a smack, but a few taps and it came loose. It was just sticky enough that the actuator couldn't push it in. I also changed the oil at that time and put in 75-90 synthetic.

Changed every oil the truck not so long ago, maybe ill pull that actuator and tap it a few times lol, can I try to hold it while all it's running and up in the air? Or is that a stupid question?
 

juddski88

Freedom Diesel
Jul 1, 2008
4,655
120
63
Chesterfield, Mass.
I thought you said the Driveshaft doesn't even spin? If that's the case, your front diff is fine. Take the selector motor off the transfercase and check the fork operation
 

ACiFiC

New member
Oct 14, 2012
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Canada
I thought you said the Driveshaft doesn't even spin? If that's the case, your front diff is fine. Take the selector motor off the transfercase and check the fork operation

Alright, I'll look into that, I just read that something always shatters in the diff
 

juddski88

Freedom Diesel
Jul 1, 2008
4,655
120
63
Chesterfield, Mass.
There's nothing to worry about in the front diff at your power level. Sometimes the slide collar doesn't fully engage or shatters anyways under high load/use/HP conditions.
 

ACiFiC

New member
Oct 14, 2012
119
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Canada
There's nothing to worry about in the front diff at your power level. Sometimes the slide collar doesn't fully engage or shatters anyways under high load/use/HP conditions.

Is there a DIY somewhere for the motor? Been reading but not finding the best info haha. What am I lookin for on this fork, obvious wear?
 

ACiFiC

New member
Oct 14, 2012
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Canada
Nothing was stuck, tcase was just changed with a new GM one, 3 year warranty too. Probably outlive my 250k mile truck lol.

Oh well! Just wanted to update this.

Tcase was making knocking noise like stuff was just getting spun around, also wasn't a drop a fluid in it haha, previous owner must have starved it
 

jlawles2

Well-known member
Jan 28, 2010
1,057
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48
Danbury, TX
If it had no fluid, look up pump rub. Its a known common problem.

If it was replaced, look up a rub kit and swap over to 30wt motor oil.
 

ACiFiC

New member
Oct 14, 2012
119
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Canada
If it had no fluid, look up pump rub. Its a known common problem.

If it was replaced, look up a rub kit and swap over to 30wt motor oil.

No pump rub, I inspected it when it was taken out.

And I'll take a look at that in a couple years, since I have 3 years of warranty
 

arneson

New member
Aug 14, 2011
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stoughton, wisconsin
I would do pump rub kit regardless if u have warranty or not. It may not have an issue till 3.5 yrs from now and then your lookin for a new case cause it ate a hole in it.
 

ACiFiC

New member
Oct 14, 2012
119
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Canada
I would do pump rub kit regardless if u have warranty or not. It may not have an issue till 3.5 yrs from now and then your lookin for a new case cause it ate a hole in it.

I do a lot of driving, just want to make sure my truck would live to use it haha, usually don't keep trucks forever