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Old September 18th, 2009, 04:45 PM   #1
kj kyle
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Default groaning noise, Im lost.

so about a year ago my truck, 1989 GMC K1500, with 3" skyjacker lift, started making a rythmic groaning noise... originally it would only do it on a right turn, at a decent rate of speed, like off ramps and such. now its to the point where it does it rolling down the driveway. it sounds like its coming from the front end somewhere.

my first instinct was unit bearing, so i replaced it and no improvements.

next i decided my CV shaft was binding.. so I replaced that, and the ball joints while I was in there. when i had the half shaft out i could turn the flange on the diff by hand no problem, when i bolted the new shaft to it the put the unit bearing back on (also new).. you could feel it binding when you turned it by hand. dont know if this makes a differance but it was on jack stands so the suspension was at full drop.

It sounds no different than when i started, so Im starting to think its something in the differential. I have 0 experience with GM IFS diffs, so do any of you have any insight on what it may be?

BTW, this all started when i put some mickeys on that wouldn't balance. I got death wobble at about 35 which probably raped my front end. ran them for a few weeks then put my old geolanders back on.
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Old September 18th, 2009, 04:57 PM   #2
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well if it helps is the front axle locked in like it would be in 4x4 mode? I am just wondering cause the last time I ran into a problem like what your discribing the dif disconnect jammed and wouldn't release.
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Old September 18th, 2009, 05:20 PM   #3
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i had the passenger side axle tube break off the housing causing a bad vibration. check that. it will be pretty obvious once you look under it.
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Old September 18th, 2009, 05:28 PM   #4
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See if the noise changes at all when locked in 4wd.

Could be a side gear, pinion bearing, etc.
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Old September 18th, 2009, 06:27 PM   #5
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i shouldve thought of putting it in 4wd. but i took an aderal this morning and i kinda jumped the gun and started ripping the whole front end out.

ready fire aim...

if there is nothing obvious... Ill take some pics once i have the diff out and see what yall think
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Old September 18th, 2009, 06:31 PM   #6
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a friend of mine's dad has a front end for that truck with 4:56 gears and detroit locker and gears for the back for sale. if you are interested let me know, im sure he will get rid of it for a reasonable price.
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Old September 19th, 2009, 11:06 AM   #7
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pm'ed.

anyone have an exploded view of the front IFS differential? i did a little google searching and couldn't find much
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Old September 19th, 2009, 05:47 PM   #8
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i think you probably hit someone and they are stuck in your front grill, look up under the fender. just joking. hope you figure it out. i know the front carrier bearings in these like to wear and make noises.
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Old September 20th, 2009, 10:48 AM   #9
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well i started tearing into the diff this morning. I got the pass tube off, then i split the case... and now i feel kind of stupid because I cant get the carrier and ring gear out anyone got any tips?
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Old September 20th, 2009, 11:00 AM   #10
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just SAS it and ditch the ifs
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Old September 20th, 2009, 12:08 PM   #11
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thats always been in the back of my mind, but i dont want to put the money into it. I have a CJ7 that needs axles, and i have a DD, so this isn't a big concern of mine. more like a plow truck / wood hauler kinda thing.
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Old September 20th, 2009, 01:49 PM   #12
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well i took it apart and everything in the diff looks fine, the problem looks to be that the collar the engages the pass. axle shaft didnt return all the way back its "2wd position" and was grinding the end of the teeth on the shaft.

so basically if Im right, I just replaced a CV, dropped the diff and disassembled it all, for a part i could replace by turning 1 nut, and seperating 1 connector.

Last edited by kj kyle; September 20th, 2009 at 01:55 PM.
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Old September 20th, 2009, 05:07 PM   #13
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Quote:
Originally Posted by kj kyle View Post
well i took it apart and everything in the diff looks fine, the problem looks to be that the collar the engages the pass. axle shaft didnt return all the way back its "2wd position" and was grinding the end of the teeth on the shaft.

so basically if Im right, I just replaced a CV, dropped the diff and disassembled it all, for a part i could replace by turning 1 nut, and seperating 1 connector.
Oops.

You live you learn. Glad it got fixed. We've all been there though.
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