Noise when engaging 4Lo?

partsman · 04-15-2009, 11:13 AM

So I find now that I have my first 4X4 truck, it is a 1996 K2500 4L80E tranny, with the three push buttons on the dash to put it into 2Hi or of course 4Hi or 4Lo, anyway I would say when doing it like I do, which is sitting still in neutral that between 2hi and 4hi it is fairly quiet when putting it back into gear from neutral, but when I push 4Lo and then put it into gear it seems to clunk I guess you would call it, and most definetly seems to want to go, lots of torque it feels like, is this normal that it is engaging a little harsher than the other two settings?

mudseeker · 04-15-2009, 12:06 PM

depends on how loud the clunk is i guess. never owned push button and don't ever plan to either.

stumpuller454 · 04-15-2009, 12:11 PM

normal, mine is push button, even engageing while slowly moving (into high) there is a clunk, wouldn`t worry about it untill the chain skips or a really bad bearing noise while moving, or indication of metal during oil flush.... good to go.

partsman · 04-15-2009, 12:24 PM

Thanks for the responses, now that leads to another question, I was told by the salesman I can shift on the fly from 2hi to 4hi or back, but need to be stopped and in neutral to engage 4 lo, is this right?
I never got a manual for it, and want to find one, but untill then maybe I can get most answers here on how to use the four wheel drive system.

Rago · 04-15-2009, 12:26 PM

It shouldn't be a problem. I had a 93 Jimmy with push button 4wd that made the same noise. I even changed the actuator motor after it went out & both motors made the same noise. If you're still worried, changing the fluid might help.

stumpuller454 · 04-15-2009, 12:51 PM

Quote:

Originally Posted by partsman

Thanks for the responses, now that leads to another question, I was told by the salesman I can shift on the fly from 2hi to 4hi or back, but need to be stopped and in neutral to engage 4 lo, is this right?
I never got a manual for it, and want to find one, but untill then maybe I can get most answers here on how to use the four wheel drive system.

yeah thats the way its supposed to work, but i can always hear a clunk when engaging it, if i can i will stop and engage it first, just to be nice to it.

batty1214 · 04-15-2009, 04:10 PM

yes, you can switch between 4hi 2hi while on the move

bigcountry78 · 04-16-2009, 07:31 PM

yea i once hit the button in my 98 doin 60 down the highway, it engaged fine, drove it 100,000 more miles without a problem. this was by accident by the way. mine also had the clunk sound whrn engaging 4 lo

jessewd10 · 05-28-2009, 05:54 PM

we have a 08 f150 and it makes the clunk as well into 4lo and its brand new
its just what they do

NCroadracer · 05-28-2009, 06:46 PM

Normal... no need to be alarmed. It's the synchros engaging and the output shaft drive drum sudden increase in RPM...

04-15-2009, 11:13 AM	#1
partsman Senior Member Join Date: Jul 2008 Location: Poco BC Posts: 83	Noise when engaging 4Lo? So I find now that I have my first 4X4 truck, it is a 1996 K2500 4L80E tranny, with the three push buttons on the dash to put it into 2Hi or of course 4Hi or 4Lo, anyway I would say when doing it like I do, which is sitting still in neutral that between 2hi and 4hi it is fairly quiet when putting it back into gear from neutral, but when I push 4Lo and then put it into gear it seems to clunk I guess you would call it, and most definetly seems to want to go, lots of torque it feels like, is this normal that it is engaging a little harsher than the other two settings?

04-15-2009, 12:06 PM	#2
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,317	depends on how loud the clunk is i guess. never owned push button and don't ever plan to either. __________________ i'd rather be hunting

04-15-2009, 12:11 PM	#3
stumpuller454 Senior Member Join Date: Dec 2007 Location: Grande Prairie, AB Posts: 2,042	normal, mine is push button, even engageing while slowly moving (into high) there is a clunk, wouldn`t worry about it untill the chain skips or a really bad bearing noise while moving, or indication of metal during oil flush.... good to go. __________________ SUPERCHARGED 454 K2500 GMC! 450hp and 600ft/lbs http://www.youtube.com/watch?v=WJ27RJHfJKE "sailing with Captain Morgan often!"

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04-15-2009, 12:24 PM	#4
partsman Senior Member Join Date: Jul 2008 Location: Poco BC Posts: 83	Thanks for the responses, now that leads to another question, I was told by the salesman I can shift on the fly from 2hi to 4hi or back, but need to be stopped and in neutral to engage 4 lo, is this right? I never got a manual for it, and want to find one, but untill then maybe I can get most answers here on how to use the four wheel drive system.

04-15-2009, 12:26 PM	#5
Rago Senior Member Join Date: Jan 2009 Posts: 72	It shouldn't be a problem. I had a 93 Jimmy with push button 4wd that made the same noise. I even changed the actuator motor after it went out & both motors made the same noise. If you're still worried, changing the fluid might help.

04-15-2009, 04:10 PM	#7
batty1214 Senior Member Join Date: Nov 2008 Location: Vernal Utah Posts: 1,131	yes, you can switch between 4hi 2hi while on the move

04-16-2009, 07:31 PM	#8
bigcountry78 Senior Member Join Date: Nov 2008 Location: upstate S.C. Posts: 296	yea i once hit the button in my 98 doin 60 down the highway, it engaged fine, drove it 100,000 more miles without a problem. this was by accident by the way. mine also had the clunk sound whrn engaging 4 lo

05-28-2009, 05:54 PM	#9
jessewd10 Full Member Join Date: Sep 2008 Posts: 33	we have a 08 f150 and it makes the clunk as well into 4lo and its brand new its just what they do

05-28-2009, 06:46 PM	#10
NCroadracer Senior Member Join Date: Apr 2007 Posts: 295	Normal... no need to be alarmed. It's the synchros engaging and the output shaft drive drum sudden increase in RPM...