?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slipping - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brewski* · 01-03-2010, 04:20 PM

My 71 3/4 ton 4x4 front end is not working correctly. I was up cutting wood the other day (ice and snow) and backed up a small hill. Heard a loud pop (passanger side) now it kinda does this slipping> pop> engaging slipping> pop> engaging. It will drive for a while then do it again when I stop and start. Seems to pull to one side a little and steer funny when not working. I already changed out the Warn locker on the passanger side it did not help. Checked the locker on the drivers side it seems fine. Any clues? HELP?

jgdually83 · 01-03-2010, 04:25 PM

sound to me like internal problems i would pull to cover and look for any broken gears. do you check the axle joint?

Brewski* · 01-03-2010, 04:37 PM

Joints appear to be good and intact. They are only a year old. Everything else is pretty new also. I will probably pull the cover when the snow lets up and see what I can see. If anyone else has had this problem let me know. Seems to go fine until one wheel starts slipping.

LONGHAIR · 01-03-2010, 05:04 PM

If the axle joints are good, it can really only be the spider gears in the differential or the lock-out hubs.

mstrav1973 · 01-03-2010, 05:13 PM

possibly chipped a tooth on a spider gear or axle shaft? did you try turning the driveline with the hubs un-locked to see if there is a pop coming from inside the differential? you said you swapped your locking hub and nothing changed?

Matt

rwolf9653 · 01-03-2010, 05:36 PM

X2 on what everyone else has already said,
but I would also like to throw in there that you should check you drivshaft for binding in the u-joints. It could be another problem area if pulling the diff cover yeilds no obvious problems.

OrrieG · 01-03-2010, 09:55 PM

If you have a 203 transfer case it might be the stretched chain slipping under load. It sounds like the noise is coming from the passenger side.

Brewski* · 01-04-2010, 09:49 AM

NP 205. The noise sounds like front passanger but I could be wrong. It only does it once or twice then it works OK until I stop. Then it will do it again. Does this help any?

bigrigpardo · 01-04-2010, 10:23 AM

not to intrude but i have a similar problem when i put my 69 in 4wd i get a pop pop pop pop from the transfer case if u put ur hand on the transfer case shifter you can feel it.

any ideas

01-03-2010, 04:20 PM	#1
Brewski* Registered User Join Date: Aug 2001 Location: Rocky Mount, MO Posts: 1,293	?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slipping My 71 3/4 ton 4x4 front end is not working correctly. I was up cutting wood the other day (ice and snow) and backed up a small hill. Heard a loud pop (passanger side) now it kinda does this slipping> pop> engaging slipping> pop> engaging. It will drive for a while then do it again when I stop and start. Seems to pull to one side a little and steer funny when not working. I already changed out the Warn locker on the passanger side it did not help. Checked the locker on the drivers side it seems fine. Any clues? HELP? Last edited by Brewski; 01-03-2010 at 04:21 PM.*

01-03-2010, 04:25 PM	#2
jgdually83 Registered User Join Date: Oct 2009 Location: Lehigh Valley , PA Posts: 23	Re: ?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slip sound to me like internal problems i would pull to cover and look for any broken gears. do you check the axle joint? __________________ 83 K30 3+3 Dually 83 K20

01-03-2010, 04:37 PM	#3
Brewski* Registered User Join Date: Aug 2001 Location: Rocky Mount, MO Posts: 1,293	Re: ?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slip Joints appear to be good and intact. They are only a year old. Everything else is pretty new also. I will probably pull the cover when the snow lets up and see what I can see. If anyone else has had this problem let me know. Seems to go fine until one wheel starts slipping.

01-03-2010, 05:13 PM	#5
mstrav1973 Registered User Join Date: Oct 2008 Location: Meridian, Idaho Posts: 321	Re: ?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slip possibly chipped a tooth on a spider gear or axle shaft? did you try turning the driveline with the hubs un-locked to see if there is a pop coming from inside the differential? you said you swapped your locking hub and nothing changed? Matt __________________ 72 chevy k-10, swb, auto, 35's, rally's, posi, 4" lift, 2.5" old style 40 series flows with headers and crossover pipe and some other stuff!!

01-03-2010, 05:36 PM	#6
rwolf9653 more ideas than money Join Date: Dec 2008 Location: spring grove, pa Posts: 1,068	Re: ?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slip X2 on what everyone else has already said, but I would also like to throw in there that you should check you drivshaft for binding in the u-joints. It could be another problem area if pulling the diff cover yeilds no obvious problems. __________________ Randy 1948 Chevy 3100 5 window 1966 Chevy C30 Dually 1967 Chevy K10 1972 Chevy K20 1972 Chevy C10 1972 Chevy K5 Blazer 1987 Chevy V10 2003 Chevy Suburban

01-03-2010, 09:55 PM	#7
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: ?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slip If you have a 203 transfer case it might be the stretched chain slipping under load. It sounds like the noise is coming from the passenger side. __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project

01-04-2010, 09:49 AM	#8
Brewski* Registered User Join Date: Aug 2001 Location: Rocky Mount, MO Posts: 1,293	Re: ?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slip NP 205. The noise sounds like front passanger but I could be wrong. It only does it once or twice then it works OK until I stop. Then it will do it again. Does this help any?

01-04-2010, 10:23 AM	#9
bigrigpardo Registered User Join Date: Sep 2008 Location: NEW MILFORD NJ Posts: 1,453	Re: ?71 3/4 ton 4x4 front end not working corretly making loud popping noise and slip not to intrude but i have a similar problem when i put my 69 in 4wd i get a pop pop pop pop from the transfer case if u put ur hand on the transfer case shifter you can feel it. any ideas



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