Something went pop and now no 4wd. Help~! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brewski* · 12-24-2003, 11:12 AM

I took my boy up a trail last night in my truck and it went up fine in 4wd. When we got to the top there is about 1 of pavement to the next trail. We were driving about 40 mph when all of a sudden we heard a pop. Then when we got to the next trail no 4wd just the back 2 turning. Any idea what happened? I looked underneath but can't see anything. Where do I start?

ljbear · 12-24-2003, 11:35 AM

Lot's of options here, so let's start with the simple. Could it have simply popped out of 4x? The older trucks are prone to this happening as the detents and linkages get worn. Is there any noise from the front end now when driving?

jmanz69 · 12-24-2003, 12:51 PM

Possible broken chain in xfer case? That would be my guess. It was probably stretched to begin with, and the strain of driving on pavement (turning corners or curves on roads = different speeds from front to back) made it give out. While on dirt, the traction differential can be overcome by slipping wheels, but it's much harder on pavement. Driving in 4WD on pavement is very hard on xfer cases in these older trucks. But also, do like was mentioned above, check the linkages and detents. Good luck, hope it's not too $$$ to fix.

FRENCHBLUE72 · 12-24-2003, 01:22 PM

I would check the front hub's to see if they are still intact.. If you have a chain in your case then it's not the 205 and a newer case.

**old Rusty C10** · 12-24-2003, 01:25 PM

i am betting on a transfer case chain too

Brewski* · 12-24-2003, 01:44 PM

NP 205 Transfer case
I have shifted into 4low or 4high and no result. Transfer case seem to be shifting i.e. you can hear the gears engage. The front lock outs turn and click fine. If the transfer case is working could it be in the front differential?

FRENCHBLUE72 · 12-24-2003, 01:47 PM

Maybe the low /high 4wd pill fell out?? Have you checked the linkage rod's to make sure they are still attached to the shift lever??

Bowtiefreak · 12-24-2003, 01:52 PM

I am willing to bet it maybe a broken front axle shaft. It happend to me before. This would still let you drive in 2wd but not 4wd.

EJ · 12-24-2003, 02:00 PM

Have someone look under your truck and see if your front driveshaft is turning. This should tell you if its a transfer case or front end problem.

**JIMs70GMC** · 12-24-2003, 02:07 PM

I bet it's an outer axle shaft (stub).

da-burb · 12-24-2003, 02:11 PM

Broken axle shaft. With the open differential the broken shaft would spin the easiest so you wouldn't have any 4 wheel drive since it isn't connected to the wheel anymore.

ckenwright · 12-24-2003, 02:58 PM

I would put the truck up on 4 jack stands on a very level surface, then turn the truck on and put it in drive or 1st. Do not get underneath it but get low enough to see if the front drive shaft is turning. If it is then something in your axle is broken, if not then you should find out what is broken with the transfer case.

breeh · 12-24-2003, 03:39 PM

Brewski, I'll trade you a couple of axle shafts for that Hodaka

72K10 · 12-24-2003, 05:34 PM

Brewski, I'll bet this is related to your steering problem. My guess is that the knuckle finally locked up and snapped something. When you fix this, you'll have fixed your steering problem. Good luck.

GM72K10 · 12-24-2003, 06:45 PM

Broken axle shaft. When mine broke also spun the timing chain, thank God I didn't turn the truck off til I limped home. Happened while plowing and hit a bare spot. Needless to say I now only plow my own and my neighbor's drive and the firehouse with a 32 year old truck.
Start by doing what EJ says.
Good Luck

Brewski* · 12-24-2003, 07:42 PM

Thanks for all the help at least I know where to star... And Beery Christmas to all.
Brew

12-24-2003, 11:12 AM	#1
Brewski* Registered User Join Date: Aug 2001 Location: Rocky Mount, MO Posts: 1,293	Something went pop and now no 4wd. Help~! I took my boy up a trail last night in my truck and it went up fine in 4wd. When we got to the top there is about 1 of pavement to the next trail. We were driving about 40 mph when all of a sudden we heard a pop. Then when we got to the next trail no 4wd just the back 2 turning. Any idea what happened? I looked underneath but can't see anything. Where do I start?

12-24-2003, 11:35 AM	#2
ljbear Registered User Join Date: Jan 2003 Location: Emmett, Idaho Posts: 858	Lot's of options here, so let's start with the simple. Could it have simply popped out of 4x? The older trucks are prone to this happening as the detents and linkages get worn. Is there any noise from the front end now when driving? __________________ Larry 72 Chevy SWB 4x4 71 Chevy SWB 4x4 My Work Truck "Don't confuse enthusiasm with capability"

12-24-2003, 01:22 PM	#4
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	I would check the front hub's to see if they are still intact.. If you have a chain in your case then it's not the 205 and a newer case. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

12-24-2003, 01:25 PM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,345	i am betting on a transfer case chain too __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-24-2003, 01:44 PM	#6
Brewski* Registered User Join Date: Aug 2001 Location: Rocky Mount, MO Posts: 1,293	NP 205 Transfer case I have shifted into 4low or 4high and no result. Transfer case seem to be shifting i.e. you can hear the gears engage. The front lock outs turn and click fine. If the transfer case is working could it be in the front differential? Last edited by Brewski; 12-24-2003 at 01:51 PM.*

12-24-2003, 12:51 PM	#3
jmanz69 Careful, they attack... Join Date: Aug 2001 Location: Waterford, MI, USA Posts: 1,107	Possible broken chain in xfer case? That would be my guess. It was probably stretched to begin with, and the strain of driving on pavement (turning corners or curves on roads = different speeds from front to back) made it give out. While on dirt, the traction differential can be overcome by slipping wheels, but it's much harder on pavement. Driving in 4WD on pavement is very hard on xfer cases in these older trucks. But also, do like was mentioned above, check the linkages and detents. Good luck, hope it's not too $$$ to fix.

12-24-2003, 01:47 PM	#7
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,606	Maybe the low /high 4wd pill fell out?? Have you checked the linkage rod's to make sure they are still attached to the shift lever?? __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

12-24-2003, 01:52 PM	#8
Bowtiefreak Registered User Join Date: Jul 2003 Location: LeRoy, Mich. Posts: 854	I am willing to bet it maybe a broken front axle shaft. It happend to me before. This would still let you drive in 2wd but not 4wd. __________________ 1968 Chevy C10 Short Fleetside/Wood floor ECE 4-6 Drop / 406 Small Block 1971 Chevelle 427 Big Block

12-24-2003, 02:00 PM	#9
EJ Registered User Join Date: Jul 2000 Location: El Dorado Springs, MO Posts: 227	Have someone look under your truck and see if your front driveshaft is turning. This should tell you if its a transfer case or front end problem.

12-24-2003, 02:07 PM	#10
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I bet it's an outer axle shaft (stub). __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

12-24-2003, 02:11 PM	#11
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Broken axle shaft. With the open differential the broken shaft would spin the easiest so you wouldn't have any 4 wheel drive since it isn't connected to the wheel anymore. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

12-24-2003, 02:58 PM	#12
ckenwright Registered User Join Date: May 2003 Location: Phoenix, AZ Posts: 104	I would put the truck up on 4 jack stands on a very level surface, then turn the truck on and put it in drive or 1st. Do not get underneath it but get low enough to see if the front drive shaft is turning. If it is then something in your axle is broken, if not then you should find out what is broken with the transfer case.

12-24-2003, 03:39 PM	#13
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	Brewski, I'll trade you a couple of axle shafts for that Hodaka __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

12-24-2003, 05:34 PM	#14
72K10 Registered User Join Date: Dec 1999 Location: New York Posts: 288	Brewski, I'll bet this is related to your steering problem. My guess is that the knuckle finally locked up and snapped something. When you fix this, you'll have fixed your steering problem. Good luck. __________________ RLTW 70C10 72K10 72K10 Cheyenne 72C10 Cheyenne Super

12-24-2003, 06:45 PM	#15
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,483	Broken axle shaft. When mine broke also spun the timing chain, thank God I didn't turn the truck off til I limped home. Happened while plowing and hit a bare spot. Needless to say I now only plow my own and my neighbor's drive and the firehouse with a 32 year old truck. Start by doing what EJ says. Good Luck __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck



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12-24-2003, 07:42 PM	#16
Brewski* Registered User Join Date: Aug 2001 Location: Rocky Mount, MO Posts: 1,293	Thanks for all the help at least I know where to star... And Beery Christmas to all. Brew

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