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Old 07-08-2022, 07:42 PM
stonybrookpictures's Avatar
stonybrookpictures stonybrookpictures is offline
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New strange Noise

OK, 1979 Wagoneer, 401 Quadratrac. Occasionally when moving off the line from a red light, if i accelerate a little aggressively, I get three loud clunk's.
(Three because I quickly calm down the accelerator when I hear the noise).
I first thought it was my 6" lift springs shifting, it still may be. I now think it might be my 4WD system. Any ideas? I know I'm not offering a lot of info, I just thought maybe this is a common problem with a known solution. I have the correct fluid for transfer and quad boxes on stand by, I don't know what fluid is in them now. Perhaps that's the issue?
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1979 Wagoneer 6" Lift, 35" tires. AMC 401.
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  #2  
Old 07-08-2022, 08:02 PM
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devildog80 devildog80 is offline
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Motor mounts?

Transmission mount?

Exhaust hangers?

Axle wrap?

Some things to check.

Mount a GoPro, if you have one, looking at each suspect item, then drive it and examine the footage.
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

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  #3  
Old 07-08-2022, 08:30 PM
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backroadin' backroadin' is offline
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ujoints? Does it come from the front or back? Can u feel it in the wheel, the seat, the floor, or at all?
Jack it up and spin the wheels and the driveshafts back and forth, see if anything sounds or feels odd.
Quick clunks loke that lead me to think driveline first, but I cant hear them either.
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73 Wagoneer - 4.6L Stroker (yeah baby!!) t176/d300, 3.73's, 33" muds, 4"spring lift, 2" body. Offy dualport w/ Quadrajet, pertronix, flowmaster.
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  #4  
Old 07-08-2022, 10:04 PM
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stonybrookpictures stonybrookpictures is offline
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I'm thinking its the chain

I don't really feel it, just the sound. Probably its the chain. Just form reading other posts by people where it was the chain.
But I will check all of the above. Thank you.
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1979 Wagoneer 6" Lift, 35" tires. AMC 401.
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  #5  
Old 07-08-2022, 10:31 PM
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sierrablue sierrablue is offline
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Mine does a similar thing every once in a while, but I haven't heard it since it's been summer and the hubs have been unlocked, so I'm assuming mine is something in/on the way to the front end. But it only does it every once in a while, so I just don't understand it. It doesn't make it go any slower, it just makes a little noise taking off from stop signs sometimes. But I have a D20 so if you think it's the chain on yours then that's certainly not my problem (or if there IS a chain in the t-case I suppose it COULD be the problem )...let us know what you find.
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Current Rig:
'71 Wagoneer (DD)
B350/TH400/D20
open knuckle D44 front (disc brakes)
6-lug conversion rear
http://www.ifsja.org/forums/vb/showt...79#post1734879

Previous Rig:
Tan '88 Grand Wagoneer
.030 over 401, TBI, headers
3" exhaust
31x10.5s
2" rear lift blocks
custom headliner
http://www.ifsja.org/forums/vb/showt...77#post1734777

"The engineering side of me says that it's more than strong enough. The redneck side of me says that it's going to fall apart and I need to beef it up."--somebody I know
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  #6  
Old 07-09-2022, 04:52 AM
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stonybrookpictures stonybrookpictures is offline
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Chain tension

Checked the chain today with the screw driver method. I get 1.1/4 " - 1 1/2" play. I'm pretty sure that's not good.
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1979 Wagoneer 6" Lift, 35" tires. AMC 401.
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  #7  
Old 07-09-2022, 06:25 AM
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stonybrookpictures stonybrookpictures is offline
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Fluid

Interestingly when I drained the unit I only got out 1 Qt. I believe it should have had 4 pints or 2 Qt. I"m on a slight incline with rear end down, so maybe its trapped a bit in the housing. Ill move to more level ground and check.
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  #8  
Old 07-09-2022, 06:26 AM
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Swap chain

So Chain can be changed while the unit is still in the vehicle correct?
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  #9  
Old 07-09-2022, 09:14 AM
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stonybrookpictures stonybrookpictures is offline
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D 20

I don't think you have a chain. My problem seems fairly common. The previous owner rebuilt the transfer case but if they used poor quality chain apparently they only last about 10.000 miles.

Here is a god write up of rebuilding a D20
https://www.motortrend.com/how-to/18...na-20-at-home/


Quote:
Originally Posted by sierrablue
Mine does a similar thing every once in a while, but I haven't heard it since it's been summer and the hubs have been unlocked, so I'm assuming mine is something in/on the way to the front end. But it only does it every once in a while, so I just don't understand it. It doesn't make it go any slower, it just makes a little noise taking off from stop signs sometimes. But I have a D20 so if you think it's the chain on yours then that's certainly not my problem (or if there IS a chain in the t-case I suppose it COULD be the problem )...let us know what you find.
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1979 Wagoneer 6" Lift, 35" tires. AMC 401.
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  #10  
Old 07-09-2022, 10:40 AM
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babywag babywag is offline
out of order
 
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need to check QT chain and do not give it too much throttle until you do!
if a QT chain gets loose enough to slip it can grenade the aluminum case.
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  #11  
Old 07-09-2022, 04:32 PM
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sierrablue sierrablue is offline
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Quote:
Originally Posted by stonybrookpictures
I don't think you have a chain. My problem seems fairly common. The previous owner rebuilt the transfer case but if they used poor quality chain apparently they only last about 10.000 miles.

Here is a god write up of rebuilding a D20
https://www.motortrend.com/how-to/18...na-20-at-home/
I know there's no chain in it, that's why I said that if there WERE a chain there, it was probably my problem. Bad joke sorry.

Thanks for the link though it'll come in handy! And good luck with your clunk.
__________________
Current Rig:
'71 Wagoneer (DD)
B350/TH400/D20
open knuckle D44 front (disc brakes)
6-lug conversion rear
http://www.ifsja.org/forums/vb/showt...79#post1734879

Previous Rig:
Tan '88 Grand Wagoneer
.030 over 401, TBI, headers
3" exhaust
31x10.5s
2" rear lift blocks
custom headliner
http://www.ifsja.org/forums/vb/showt...77#post1734777

"The engineering side of me says that it's more than strong enough. The redneck side of me says that it's going to fall apart and I need to beef it up."--somebody I know
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  #12  
Old 07-10-2022, 05:53 AM
'89_Wagon '89_Wagon is offline
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3 clunks.... huh. I get a grinding noise if I do the same thing but that's from bad engines mounts allowing the engine to twist too much.... allowing the front driveshaft to rub against something. That's on a NP229 setup though. Wondering how worn engine mounts might impact a quadratrac setup?
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  #13  
Old 07-14-2022, 12:08 PM
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rang-a-stang rang-a-stang is offline
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Quote:
Originally Posted by stonybrookpictures
So Chain can be changed while the unit is still in the vehicle correct?
Yep! It's not hard, but plan a saturday for the first time.

is your still full time or was it converted to part time? It makes a minor difference. 1.24-1.5"?! YES! you need a new chain!!!
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  #14  
Old 07-16-2022, 02:10 AM
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stonybrookpictures stonybrookpictures is offline
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Not driving until chain swap

Took a gamble and purchased a used Morse chain. I'll see how it goes.
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1979 Wagoneer 6" Lift, 35" tires. AMC 401.
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  #15  
Old 07-17-2022, 08:31 AM
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rang-a-stang rang-a-stang is offline
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Awesome! Let us know how it goes! Feel free to post some stonybrook project pictures too!
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  #16  
Old 07-17-2022, 10:50 AM
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devildog80 devildog80 is offline
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Not to many videos of that fix.

Would be nice to have a good one showing the whole process.....if you can
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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  #17  
Old 07-17-2022, 06:30 PM
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stonybrookpictures stonybrookpictures is offline
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Video of in vehicle chain replace

OK, Ill give it a shot. I am a shade tree mechanic for sure, but I do make video for a living.
There will be a bunch of mistakes I'm sure but what the hell.
I was under the rig today, I already see I have clearance issues with the custom exhaust and the gas tank looks awfully close to the reduction Unit.
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1979 Wagoneer 6" Lift, 35" tires. AMC 401.
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  #18  
Old 07-18-2022, 01:02 AM
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rang-a-stang rang-a-stang is offline
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Yeah, the hardest part is getting the reduction unit out but it
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  #19  
Old 07-18-2022, 01:03 AM
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rang-a-stang rang-a-stang is offline
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Yeah, the hardest part is getting the reduction unit out but it is not that hard. There are no special tools needed. Just take your time, lay down some cardboard (because fluid gets everywhere), and you will knock it out! One easy pointer, make sure you label your vacuum lines before you take them off.
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