Question about 1999 Chevrolet Silverado 1500
I can not get the 4x4 to engage. I can shift to neutral and when shifting back to 4x4 high or 2x4 I hear the grinding so I know it works. the light comes on but it never locks into four wheel what is the problem? the tranmission on the pickup is automatic.
I pulled and replace both the tranmission fuse and the 4x4 fuse and that was not the problem.
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
Sounds to me like the selanoid that locks in the front axels in is not working. might be a place to start. easy chk. unplug it and take it out put 12 volts to it and see if it moves. you can also chk. to see if you got power to that plug. test with testlight. hope this helps.
Posted on Dec 30, 2008
Just taking a stab in the dark..your transfer case is more then likely the culprit.
Posted on Dec 29, 2008
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jan 05, 2015 | Cars & Trucks
Jan 14, 2012 | 1991 Jeep Wrangler
Jan 22, 2011 | Ford Excursion Cars & Trucks
Dec 06, 2010 | GMC Yukon Cars & Trucks
Apr 11, 2017 | Ford F-150 Cars & Trucks
Jan 10, 2010 | 2002 Ford Explorer
Aug 15, 2009 | 1998 Dodge Ram 1500 4WD
Mar 01, 2009 | 1992 Jeep Wrangler
Feb 08, 2009 | 2001 Ford F150 Styleside SuperCrew
Nov 27, 2008 | 2002 Jeep Liberty
541 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: