Transfercase

[Debeard77]

New to page thanks for any advise. 97 Sierra 4wd. Transfercase motor just clicks (even with ignition off) lights flash then stay on 4wd low. Never engages. Has new tccm, encoder/motor, switch on dash, front diff acuator, all fluids a full. Any ideas?

Edited January 11, 2022 by Debeard77

[Supreme Pizza]

51 minutes ago, Debeard77 said:

New to page thanks for any advise. 97 Sierra 4wd. Transfercase motor just clicks (even with ignition off) lights flash then stay on 4wd low. Never engages. Has new tccm, encoder/motor, switch on dash, front diff acuator, all fluids a full. Any ideas?

 

 

 

   Hi.

 

Can you provide more specific information?

 

How did this problem come about?

Can you shift between different ranges at all?

What do you mean that it clicks even when ignition is off? What makes it click? Pressing buttons?

 

Did this problem happen before you replaced all that stuff, or did it happen after you replaced all the parts?

[Debeard77]

Just got the truck not long ago was doing before parts. With the key out the transfer case motor will  keep "clicking" like its trying to shift the case..there is no 4wd at all with not go in low or high. Have to take the fuse out or will just go and go.  Could the case be broke stuck in 2wd?

Edited January 11, 2022 by Debeard77

[Supreme Pizza]

I would drop the transfer case fluid and look for metal shavings or glitter in the fluid.

 

 

 

[Supreme Pizza]

Also, when you shift the transfer case, are you following the instructions in the owners manual?

 

Simply pressing the tranfer case shift buttons is not the correct procedure. There are other necessary steps that must be taken if you want to change the tranfer case settings.

[Debeard77]

Just changed it no flakes. What steps are u speaking of?

[richard wysong]

try disconnecting the battery. sometimes that works to reset the system. the only time I have seen that happen was on a 2000 Blazer with a bad battery. new battery and the system reset

[Supreme Pizza]

9 minutes ago, Debeard77 said:

Just changed it no flakes. What steps are u speaking of?

 

 

I cant tell you what your vehicle needs. Here is what my rig wants, in order to shift from 4L to 2H:

 

1)  Engine running.

2) Transmission in neutral.

3) Vehicle rolling forward or backwards at 1 or 2 MPH.

4) Press transfer case shift button.

 

Your rig might want a different procedure.

 

 

[richard wysong]

if that doesn't work remove the motor from the tc and see if you can shift it manually. if you can't you found the problem

[Supreme Pizza]

5 minutes ago, richard wysong said:

if that doesn't work remove the motor from the tc and see if you can shift it manually. if you can't you found the problem

 

 

Ya, that's a good idea. At least he could get it into 2H so that it can be driven.

 

It may shift by hand more easily of the transmission is in neutral. (might want to chalk the tires).

 

 

 

[richard wysong]

I don't know if its possible to install the motor incorrectly but thats a possibility as well

[Debeard77]

Have shifted it like that.

I will see if it will shift manually.  Thank you

[Debeard77]

Pulled the encoder motor of transfercase I can shift it manually. Does anyone know how hard it should be to shift? Seemed like it took a lot of force to shift it.

[richard wysong]

it may be normal with out the truck rolling. with the encoder motor off but connected does it work when you try different modes? does it still click when shut off? if it seems to be working properly manually put it in 2hi and reinstall the motor and see if it works

[richard wysong]

the manual shift tcs sometimes take a good tug to change modes so as long as it does shift its probably ok.