Question about GMC Cars & Trucks
Replaced encoder motor, transfere case in neutral and will not shift at all blows TREC fuse when you try to shift it with switch in dash
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Posted on Jan 02, 2017
I figured I'd write a followup in case it helps somebody else.
Per @ccn7's information I did some troubleshooting and determined that the problem was the thermal linear actuator (TLA) [GM# 26013495). I ordered an aftermarket replacement (600-100) from Amazon.com cheaper than I could get wholesale from a parts store.
It worked except that I had to remove the electrical connector from the new unit and attach the connector from the old unit. Apparently the one I ordered is for trucks manufactured before 01-02-1996. Instead, I should have ordered the newer design (600-101) and my connector would have fit. (Or so I'm lead to believe.)
I've also discovered that you can get a replacement kit that eliminates the TLA altogether. It's more expensive and more work to install, but apparently it provides additional benefits over the standard TLA. Google Posi-lok if you're interested.
Thanks for stearing me in the right direction ccn7!
Posted on Jan 21, 2009
SOURCE: 4x4 not working
Have you checked the front axle shift solenoid? I have seen these break and have seen the fork shear as well.Make sure it is engaging when you push the button.
Posted on Jan 22, 2009
yea its not shifting again like before ? sounds like your transfer case solonoid has possably gone bad again .. these are a sometimes dont work item .. It is what shifts the transfer case into gear and it might be a little worn or weathered and not letting the switch kick it in gear all the way from the N position. thanks Jerry holler if you need more.
Posted on Feb 05, 2009
the encoder motor sensor is inside the encoder motor. the encoder is located at the transfer case. Remove the encoder and by part number 88962315 this is the sensor. you will have to retime the motor after
hope this helps
Posted on May 06, 2009
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