How To Install Replace 4x4 Axle Actuator Chevy Silverado GMC Sierra 1999-06 - 1AAuto.com




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Pierre Perea: 93 Chevy Silverado, 1500 - works only in 4w lo - if taken out of 4 w lo it takes about 4 or 5 tries for it to re-engage in 4 w lo. 2 hi or 4 hi will not engage.

Seth Wiley: I have a 2002 chevy silverado 1500. I can hear my transfer case switch to 4wd and the front axle locks. I checked the actuator and it extends when in 4wd but my hubs don't lock in. Could my actuator not be extending all the way or what could the problem be?

MrAjd1982: i have an 05 tahoe that wont go into 4lo, could this actuator need replaced, it makes a clang clang sound when i hit the 4lo and then just stays in 2hi

will Janis: i have a 95 gmc, that won't engage the 4 wheel drive, shifter works but lights won't come either

Travis Henning: I have a 99 Silverado with push button 4x4, it doesn't like to go into 4hi. I just replaced the transfer case motor which was bad. I checked fuses, and tried replacing the dash switch. Could it be the actuator thats bad, not letting it go into 4 hi? when I press 4 hi the button blinks a few times and you can hear the motor trying to shift but most of the time goes back to what it was in before.

oneloudchevy32: I have a 2000 silverado z71. The problem is when I put it in 4wd I can hear it engage but its still in 2wd. I also have a service 4wd light on. I know its not the switch because it works. Just the front wheels dont pull. Ever heard this before? Could it be my actuator? Thanks for the video.

Rodney Allred: i have a 1996 GMC 4x4 truck is stuck 2 wheel drive. my lights on the push button blink but the front wheels wont engage. could it be the actuator? thanks for youre help

troy kubitz: i have a 2005 5.3 silverado w/push button 4wd. it is stuck in 2wd. When 4hi or 4lo buttons are pushed no lights blink, no mechanical sound of trying to engage. is it the Actuator switch? How do i test the existing actuator switch? Or could it be the button panel switch? What is more likely?

alejandro rodriguez: I have a chevy Tahoe 2000 . the front shaft that goes from transfercase to front diferencial is always turning 2wd or 4wd is this normal?

eclipse1525: 2005 Chevy Z71 1500. Truck will work in 4wd auto, but can not drive if in 2hi or 4hi. You can switch to 4hi and 2hi but once I put the truck in drive, going 5-10mph, you hear gears griding trying to switch back(?) and I have to stop the truck and place in park (with a whirring type sound when doing so) turn off the engine, start up again and place in 4wd auto. The truck while in 4wd auto, will then drive but with what feels like a "drag" in the engine at around 30-35mph. If anyone can help with this, it would be appreciated!

smallblock42: wow...went today after bench testing old actuator after coming to the conclusion it was done for ..went by advance auto...for 69 bucks plus tax.. picked up new..DORMAN 600-100....installed in minutes....BAMMMM...I had 5 cedar stumps in front driveway to remove(PULL UP) YES PULL UP...4wd is working like new,,thanks

madsamoan26: Hi. I was going up a hill on a rainy day and put my 2002 tahoe in 4wd and only the back tires were spinning. Is this the switch I need most likely? Thanks

Jack Lalanne: I have a 99 Silverado Z71 and my "Auto 4WD" button doesn't work (the rest of the buttons work fine). Any thoughts on what the likely problem is would be greatly appreciated.

madsamoan26: Hi. I was going up a hill on a rainy day and put my 2002 tahoe in 4wd and only the back tires were spinning. Is this the switch I need most likely? Thanks

Patricia Garner: i havea 99 z71 and will got in to 4x4 low but not hi !! will this fix it

1A Auto Parts: There could be either a fault with the transfer case, shift motor or the front differential. Bringing it into the shop and having them read the codes will be the best bet at this point.

1A Auto Parts: Make sure that the actuator has power or vacuum to it.

Rex Ward: Excellent Video! Thank You. I watched because I am looking at buying a 2001 GMC Sierra that needs this part replaced. It was stuck in 4 and the current owner replaced the transfer case and the dash switch. He then unplugged the actuator and it went back to 2. Anyway, I have a 2004 suburban that is giving me a service 4WD message, could this be the problem? It's a Z71 but I assume that the transfer case and such is the same. Thanks!

1A Auto Parts: @pooh3700 It could be the actuator. You may also want to inspect all of your vacuum lines in the engine bay to see if there are any broke or disconnected ones that could be causing the issue. Hope this helps you out.

1A Auto Parts: @Davaith That could be a bad wheel bearing. You may want to check them to see if they're worn.

shawn slater: the front cv joint in my 2500 gmc 1990 wont stay in the transfer,keeps popping out,what could be wrong

1A Auto Parts: You may want take a look at the look at the transfer case to see if it was damaged.

Ramon Corona: u dnt got any viedos of how to pull out a tranny on a 1999 gmc yukon

1A Auto Parts: Hi Jeff, You could put the truck in 4x4 mode jack the front end up and try to turn the front tires by hand. If they do not turn, then the transfer case is locked into 4WD. Hope this helps you out. 1aauto.com 888-844-3393

Terceira73: "wasn't working" to correct my earlier comment regarding the 4wd.

imaniguana: I have an 03 Avalanche z71 1500. The front differential is engaged all the time, yet the 2WD button is lit. I've tried switching through all kinds of combinations 4 HI, 4 LO, 2HI, neutral, but I can't get the front differential to disengage. I took it to one mechanic and he said it's not engaged and there's nothing wrong, yet I hear all the front differential sound when I'm driving and my gas mileage indicates it's engaged. What do you think the problem could be?

1A Auto Parts: Then the issue might be related to the linkage not being in the correct position.

1A Auto Parts: It could be an actuator or a vacuum leak issue. 1aauto.com 888-844-3393

1A Auto Parts: Currently we do not. Thanks for visiting our channel on YouTube.

1A Auto Parts: It could definitely be the the issue but it could also be the transfer case shift motor. You might want to see if the motor is working first and then see if the actuator is pushing out when you hit the 4hi.

jofes51: Alright I have a problem. its a 2001 chevrolet silverado 1500 z71. I never had any problems with my truck not going into 4wd. I put a body lift and a new set of tires on it and the day that I completed this my service 4wd light came on. every now and again it will go away and I can lock it into 4hi and 4low no problems coming out of either as long as my truck doesn't get turned off while its engaged (if so the service 4wd light will come on and Ill have to mess around with my truck untill it

1A Auto Parts: @Dudedaaman It could be. You may also want to have the computer scanned to see what the culprit might be. If there's a code stored, it should tell you what it is.

mario d.c: hi can anybody help me im really lost i have a 1990 chevy silverado &i went to put it in 4 wheel drive yesterday &my shifter wont move i know that i have to put it in neutral but it still wont move didn't wanna force it so i left it alone being that it was -20 (extremely cold) i didn't want to force it &risk breaking my shifter .

1A Auto Parts: If it's not working, you should make sure that there's power going to the actuator.

theannoyingradio: How much do these cost??

02CamoZ71: Hi. How do I know if my actuator has gone bad?

1A Auto Parts: It may be that the actuator has gone bad.

Moe: @1aauto i have a 1999 chev blazer 4x4, there is a dash in my car saying 4x4 service, it dose go off and came back on again, now its always on, when it dose go on 4x4 doesn't work, am not sure if its just the switch or the axle Actuator or something else.

1A Auto Parts: We currently do not have a video for that particular year. You may be able to apply some of the basic steps shown in this video to your application.

armenian49er: It was the actuator thank you

1A Auto Parts: You shouldn't have to. If you have a check engine light on you may want to pull the code to see what it points to.

ital stal: theres no switch, it changes with a stick shift.

Belo83: i cant seem to get my actuator to budge. using big ass wrenches and it still slips because the bar is in the way. any advice? 03 silverado 4x4

1A Auto Parts: The issue could be the switch itself is actually bad.

Daniel Kwarteng: my 4x4 toyota surf manual front axel is catchy, is like something is holding the front tyres , i need ur help please

imme8893458: I have 1992 GMC 1500 and i replaced the actuator and i still dont have any 4wd.Do i have to replace the wires as well or get a spacer or something?The light wont go on and nothing happens.Please help.

mario d.c: thank you for the respond but in case i let it warm up per say 15 - 20 min. &it still wont shift what do you think it could be? the actuator ? it's never done this before it always went smothly into gear ...

1A Auto Parts: We don't have a vacuum or wire diagram for this vehicle. It could just be a weak actuator.

Tony Pence: I have a 2005 z71 silverado 1500 that the four wheel drive does not work. The lights on the switch light up on initial start of the vehicle then nothing. Where would be a good place to start troubleshooting?

1A Auto Parts: It should break free for you as shown in the video. Is the nut on the actuator stripped from the wrench slipping on it? If it is and you can't get a good bit on the plastic, you may be able to use a pipe wrench to break it free.
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