Lost all gears even 4X4 will not engage

Tiny
PANCHOSANCHO
  • MEMBER
  • 2001 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
Driving and stop sign so coming from a stop.I step on gas and I am going halfway through intersection lost gears like I popped it in neutral, and I coasted to a stop. First thing I thought was linkage and no works great. Then I thought because I heard no pop or anything that I lost a vacuum lime and so I look around down there and there is a elbow for a hose down there exposed, and it is on the transfer case. Where does that hook up to? Then I get towed home. I am hoping that is the problem, if not I am going to be using this site all night.
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Friday, December 30th, 2016 AT 5:28 PM

4 Replies

Tiny
STEVE W.
  • EXPERT
That would be a vent line. Nothing vacuum controlled on that T-Case. It is possible that the T-Case did shift into neutral. It would mean the encoder motor or the T-Case controller are faulty but it is possible. The other option is that something inside the trans failed. Like the forward clutch sprag. Not uncommon with the 4L60E.
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Saturday, January 26th, 2019 AT 8:46 PM
Tiny
PANCHOSANCHO
  • MEMBER
Forward contract sprag can I reach that just by dropping the pan?
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Saturday, January 26th, 2019 AT 8:46 PM
Tiny
PANCHOSANCHO
  • MEMBER
My mechanic was saying maybe this little module under the steering column he had to change one out before same symptoms. That is hard to believe but I am giving him a shot.
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Saturday, January 26th, 2019 AT 8:46 PM
Tiny
STEVE W.
  • EXPERT
The sprag is a part inside the transmission. Basically the transmission would have to come out and be gone through.
The module would be the T-Case control module. As I said it can shift into neutral if faulty.
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Saturday, January 26th, 2019 AT 8:46 PM

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