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Old 04-08-2017, 03:31 PM   #1 (permalink)
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No front output from t-case

New here but looking for some help on a 4x4 issue, I have a 2000 Silverado 1500 nbs with the 5.3 4L60e and np 246 with about 180k on it. I currently have no output to the front wheels, I have tried searching every where but found nothing.

Here is what I know, front diff is locking in (verified by putting on jackstands and spinning by hand), wheels will only spin in 4x4 if it is off the ground and they are pushed by hand (will slowly spin but eventually stop). I also recently pulled the transfercase and put a new clutch return spring in it and new clutch disc and steels in, however I did not measure the clutch pack with the special tool or use any shims as I was told by 2 different shops and the dealership they had no clue what I was talking about. So my question is could not checking and shiming it be the reason I have no power to the front wheels. I also changed the front differential fluid and found a decent amount of metal shavings in it but have read it is somewhat normal with these. Today I also replaced the encoder motor as I have read sometimes they become weak and can't put enough pressure on the clutch pack to engage it but this did nothing. Any help would be greatly appreciated.
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Old 04-08-2017, 03:49 PM   #2 (permalink)
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can you hear the motor activate?

try putting it in 4low, see if that engages if not might just be a electrical issue to the motor.

not quite sure about the full sized trucks but the s10s around your year had a 4x4 control module that often went bad
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Old 04-08-2017, 03:58 PM   #3 (permalink)
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Yes I can hear it activate and the previous motor was actually louder than the new one and had a very audible clunk when I hit the button, I am going to try to get another one because these are well know for being bad off the shelf
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Old 04-08-2017, 06:50 PM   #4 (permalink)
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Check the front axle again and put resistance on the wheels. Wthey can spin simply from oil and component drag.

With no shim and new pack discs you should have at the very least some power to the tires, it may slip but it should make something.
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Old 04-08-2017, 08:13 PM   #5 (permalink)
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Check the front axle again and put resistance on the wheels. Wthey can spin simply from oil and component drag.

With no shim and new pack discs you should have at the very least some power to the tires, it may slip but it should make something.
I jacked it up again and put it in 4wd and the fronts barely spun by themselves and were easily stopped by just my hand, it has absolutely no power from the t case when on the ground and very little when off the ground
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Old 04-08-2017, 08:43 PM   #6 (permalink)
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Only jack up one wheel. If it is locked the tcase and axle are working.

If it spins the drive line then the tcase is not working

If it spins but the driveline does not your axle lock maybe shit. And thats where the power is going
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Old 04-09-2017, 02:12 PM   #7 (permalink)
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Only jack up one wheel. If it is locked the tcase and axle are working.

If it spins the drive line then the tcase is not working

If it spins but the driveline does not your axle lock maybe shit. And thats where the power is going
Ok so the drive line is spinning so it's the t-case my question now is why isn't it working? Could the encoder motor be too weak to fully engage it? Could not having a shim cause it to slip? Also could the speed sensors have anything to do with it, I may have over tighten them when I reinstalled them.
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Old 04-09-2017, 03:41 PM   #8 (permalink)
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No. Vss does nothing unless you are trying to use the auto 4x4/awd function..

The shim shouldnt really neutralizle the output, yes it could slip but you should still have some % of power.

There could bhe a few reasons its not making power.

My next step would be to pull the shift motor off and try manualy selecting the gears and see if it cycles and grabs
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Old 04-09-2017, 03:41 PM   #9 (permalink)
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No. Vss does nothing unless you are trying to use the auto 4x4/awd function..

The shim shouldnt really neutralizle the output, yes it could slip but you should still have some % of power.

There could bhe a few reasons its not making power.

My next step would be to pull the shift motor off and try manualy selecting the gears and see if it cycles and grabs
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Old 05-16-2017, 12:39 PM   #10 (permalink)
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No. Vss does nothing unless you are trying to use the auto 4x4/awd function..

The shim shouldnt really neutralizle the output, yes it could slip but you should still have some % of power.

There could bhe a few reasons its not making power.

My next step would be to pull the shift motor off and try manualy selecting the gears and see if it cycles and grabs
Sorry for no response, I've been super busy but I decided to just pull the front diff and open it up. Upon opening it I found 4 or 5 chunks of metal in the case by the magnet. I pulled the carrier assembly out and noticed the spider gears were pretty chewed up but not comepletely rounded off or smeared like I've seen in others could this be the cause, they still catch and rotate smoothly but I'm not sure if it's the cause of my 4x4 not working?
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Old 05-19-2017, 06:15 PM   #11 (permalink)
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Go back to post 7. You already narrowed down the problem to your transfer case. The crappy side gears in the diff would not cause your tcase to not have a front output. if they were trashed the front driveshaft would not spin when you spun the one wheel that was off the ground. Take the encoder motor off and make sure it is going into gear. I have found some that sound like they are and just are not quite there. Also do your testing in 4 Hi.
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Old 05-22-2017, 06:14 PM   #12 (permalink)
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Go back to post 7. You already narrowed down the problem to your transfer case. The crappy side gears in the diff would not cause your tcase to not have a front output. if they were trashed the front driveshaft would not spin when you spun the one wheel that was off the ground. Take the encoder motor off and make sure it is going into gear. I have found some that sound like they are and just are not quite there. Also do your testing in 4 Hi.
Ok I will try and figure it out tomorrow afternoon, could it have anything to do with the shift fork being worn?
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Old 05-22-2017, 09:23 PM   #13 (permalink)
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Absolutely
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Old 05-23-2017, 09:05 AM   #14 (permalink)
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Go back to post 7. You already narrowed down the problem to your transfer case. The crappy side gears in the diff would not cause your tcase to not have a front output. if they were trashed the front driveshaft would not spin when you spun the one wheel that was off the ground. Take the encoder motor off and make sure it is going into gear. I have found some that sound like they are and just are not quite there. Also do your testing in 4 Hi.
Came home for lunch and pulled it off. I can shift it manually but it still has no power to front wheels. So at this point should I just pull the t-case and put in a used one from a local junkyard, only $325 for a used one.
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Old 05-23-2017, 11:54 PM   #15 (permalink)
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Make them warrenty or open it up and prove its not a pos.
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Old Yesterday, 04:01 AM   #16 (permalink)
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Make them warrenty or open it up and prove its not a pos.
Went and bought one and put it in, went down to $275 and got a warranty, got one that was reman from gm at some point, opened it and it was spot less. Now kits in and the motor will shift it but then shift back into 4 low, it won't shift even with the motor off the t case, it's staying stuck in 4 low, my guess is tccm? I checked the resistance on the switch and that's within spec, not sure what it can be at this point other than tccm.
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Old Yesterday, 06:13 AM   #17 (permalink)
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Encoder switch in the shift motor. Use your motor
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Old Yesterday, 09:40 AM   #18 (permalink)
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Encoder switch in the shift motor. Use your motor
That is with my motor so new go get a new motor?
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Old Yesterday, 02:41 PM   #19 (permalink)
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Update, all my issues have been fixed, now shifts flawlessly, I picked up a used encoder motor and took care of the shifting issue and now have front output and 4hi and 4lo. I'm assuming the transfercase is toast but I am going to pull it apart sometime soon and find out what went wrong
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Old Yesterday, 04:42 PM   #20 (permalink)
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Ps thanks to all for the help
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Old Today, 07:29 PM   #21 (permalink)
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Tore apart the old case apart today and found my issues. It probably had something to do with my clutch apply plate being in 4 different pieces, and case being packed full of metal shaving and chunks of apply plate. Also burnt and warped a few steels and friction disks in the clutch pack. Found my the shift fork to be toast too along with a chewed up shift cam.
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