Hello, I'm new to the forum. I don't know if this has been asked or not but I am having trouble finding any info. I understand this is a car forum, but my 2003 chevy 1500 4x4 had the trans and tcase fall out of it. So after changing them out with what I had, the truck doesn't move. are the neutral safety switches different from 99 to 03? When you put it in gear it doesn't go anywhere and when you try to put it back in park it just rattles the park pins. I am wondering if all i have to do is put the right switch in and it fixes the issue. TIA..

 

How did the original Automatic Transmission and Transfer-Case "fall out" of your 2003 Chevrolet?
Is this a Tahoe, Suburban, Silverado, or Avalanche?
Which model Transfer-Case was in the vehicle originally (if you do not know, look at the RPO sticker in the Glove-Box and post here any codes that start with the letter "N")?
So you had the 4L60E and the same model Transfer-Case installed from a 1999 vehicle?
What was the 1999 vehicle?
What else was damaged on your vehicle? ...Transmissions and Transfer-Cases DO NOT normally "fall out" of a vehicle.
Any wiring, electrical components, and electronics/ Control-Modules replaced?
If so was there any programming performed.
If somehow you had the BCM replaced... they CAN NOT be reprogrammed, get your money back.
Did this occur due to rust/ rot damage?
Where did you obtain the Transmission and Transfer-Case from?
If these components came from a Junk-Yard... where the supposed to be working/ driving components?
It would be a shame if the Transmission or Transfer-Case were broken/ inoperable.

Start out answering all these questions...
If you do, I will return to help you further.

 

It fell out as in slipping gears in trans and bearings in tcase going, bad wording on my part, they are both cooked. Spare trans came with the silverado when i bought it from a buddy tcase case from a guy near me who said it was good, nothing was damaged. The trans is out of a 99 my truck is an 03. i am wondering if the neutral safety switch on the 99 is pinned different then my 03 causing it to not select a gear. The trans is a 4L60e from a 99 pick up, tcase is a np8 (np246) thanks

 

There are only two versions of the PNP Switch assembly.
Prior to 2004... Connectors shown in the image below:



Terminal placements are as follows:


The 2004 and Up version... Connectors shown in the image below:


Terminal placements are as follows:

 

So the transmission should be the same and work? What would be the reason I can jack the back end up and spin the tires in park?

 

Just throwing this out there...

The New Process 246 Transfer-Case is an Electronically operated Automatic All-Wheel Drive Unit.
Did you reuse your original Encoder-Motor for the Transfer-Case?
The NP/ NV Encoder Motors do not have the greatest reputation and have been know to crap-out without warning.
This Unit uses a clutch-pack just like an Automatic Transmission (Over-Drive Frictions and Steels from a Chrysler 48RE... Borg-Warner High-Energy preferred).
Are you certain that the Unit operates/ is not in Neutral?

 

could the neutral safety switch its self be toast? Did not use the original encoder used the one that came with tcase. The button was selecting everything. Truck still wasn’t moving. Also tried pulling the encoder motor off and turning tcase into different ranges and never changed a thing. Also aware of the how it works. Just not good with electric bs

 

The PNP Switch Assembly is for Starting the Engine (Gear Selector must be in Park or neutral) and activating the Reverse Lights.

The Transmission (if good) will still work with all the Electrical Connectors disconnected.

The next step is to unplug the main Electrical Connector from the Transmission.
This one:



If the Transmission is good, it will work in Reverse and Drive with 3rd Gear ONLY.

 

Sounds to me like the transfer case is in neutral, the noise that you are heaering is the parking pawl hitting the final drive. Put the vehicle in park then try to push vehicle this will confirm if transfer case is in neutral. Good luck!