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  #1  
Old 12-20-2005, 03:20 PM
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JeepNOFEAR JeepNOFEAR is offline
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I went 4wheeling this weekend and everytime I tried to climb something or gave it gas up a hill I would hear a poping noise in the rear. I was just woundering what the possible problems would be. I'm thinking my ring gear might be missing a few teeth. I know its not the U-joints either.

My truck is 76 cherokee 401 / TH400 / Q/T / Dana 44s (3.08 gear ) with 33s.

Thanks [img]smile.gif[/img]

[ December 30, 2005, 10:34 AM: Message edited by: JeepNOFEAR ]
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  #2  
Old 12-20-2005, 03:26 PM
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did you put some eyes on the ring gear yet?
it wasn't an exhust pop, right?
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  #3  
Old 12-20-2005, 04:38 PM
GWJoe GWJoe is offline
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how about differential lube? do you need the friction modifier in your rig? is so, how old? maybe limited slip not working right. I am sooo far from being a rear end expert, but that is the best i can come up with.

Joe
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  #4  
Old 12-20-2005, 05:22 PM
illegalFSJ illegalFSJ is offline
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Are you sure it wasn't the sound of the chain in your quadra-trac slipping on the sprockets? So far, every Q-trac FSJ I've owned has made that noise (until I replaced the chain!)
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  #5  
Old 12-21-2005, 02:14 AM
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JeepNOFEAR JeepNOFEAR is offline
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Quote:
Originally posted by illegalFSJ:
Are you sure it wasn't the sound of the chain in your quadra-trac slipping on the sprockets? So far, every Q-trac FSJ I've owned has made that noise (until I replaced the chain!)
Can the chain slip in 2wd, because it pops in 2wd also?

I hope its the exhaust poping.
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76 Cherokee Camo(Parts)
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77 Cherokee blue 360/T18/D20/33s
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  #6  
Old 12-21-2005, 02:40 AM
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It will pop if the chain is stretched in either 2 or 4wd since it is a drive chain. Easy enough to check; drain the fluid, open the small inspection plug on the bottom of the QT, and insert a screwdriver. If the chain has more than 3/4" of play, time to replace.
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73 J4000 "The $LUT" 360 V8 bored .040 over Edelbrock 2131 1407 4V carb K8600 cam Dual Flowmaster 40 mufflers TH400 QT 3.73 Dana 44s
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  #7  
Old 12-21-2005, 04:45 AM
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chrisnsarah chrisnsarah is offline
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I agree, it's the chain. Been there before.
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  #8  
Old 12-21-2005, 03:19 PM
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I'm off from work tomorrow so I'll check it out, thanks a lot .

[ December 21, 2005, 10:10 PM: Message edited by: JeepNOFEAR ]
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  #9  
Old 12-22-2005, 02:39 AM
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Can I buy this chain at a local auto parts store or do I have to go to the dealership?
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  #10  
Old 12-23-2005, 03:00 AM
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A good parts store, NAPA or local (non-chain) parts store should be able to get a QT cahin. Make sure you tell them it's a Borg-Warner 1339 Quadratrac so they don't get you an NP 219 (also called a QT) chain. There are some cheapo chains out there, So try to get a Morse brand chain or a Cloyes. I installed a Cloyes in my truck and it has done just fine.
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78 Cherokee Chief WT "Old Blue" 360 V8 4V TH400 QT
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  #11  
Old 12-23-2005, 03:05 AM
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Alright thanks for all the help. [img]smile.gif[/img]
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  #12  
Old 12-30-2005, 04:40 AM
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Before I drained the Q/T I stood on the side of a hill while I had my dad gas it up a hill, it does sound like the transfercase.

I drained it and stuck a screw driver in the hole. I marked the screw driver just touching the chain then I pushed up on it and made a mark. It messures a 1/2in. Then I put more force on it and I made another mark. It messures 3/4in.

You said if its more then 3/4 to replace, but its not.

Should I just go ahead and spend the $150 and buy the chain?
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76 Cherokee Camo(Parts)
76 Cherokee Camo 401/TH400/Dana300/HD44/14bolt/36s
77 Cherokee blue 360/T18/D20/33s
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  #13  
Old 12-30-2005, 05:21 AM
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fulsizjeep fulsizjeep is offline
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That slack should not be enough to make the sound. When it gets 3/4" or more, the chain will tend to slip up on the teeth of the sprockets under torque and when it can't go no more, it will snap back to the bottom of the sprocket making the sound. When there is enough torque and slack, the chain will slip on the sprocket and the case will get grenaded. That looks kinda like this:



If you only have 1/2 to 3/4" slack, I would guess the spline on the output shaft (front or rear or both) is worn and you are shaving the splines down in the diff hub or on the shaft itself. Usually, the wear is on the hub side. Looks kinda like this:



More on that particular issue found at RB site here:
http://home.mchsi.com/%7Eriverbeast/qt01.htm

The spline popping is not as deep a sound as the chain slipping on the sprocket but similar.
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  #14  
Old 12-30-2005, 07:21 AM
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..
JeepNOFEAR;

... Retest your chain slack
… If you can accelerate from a stop briskly up a 30 degree hill in 4low without the BW-1339 transfer case chattering or feeling like it has a ratchet effect and the truck seeming to be jerking then the QT chain is in good shape. If the chain just jumps while remaining on the sprocket it’s not good but if the chain jumps and slips off the sprocket you will need a new case.
... The best way to check chain slack is by parking the Jeep front end up on a 5 degree grade. Put the Th-400 Transmission in park and let the truck roll back until all the drive line slack is tight against the parking pall. Lightly block the wheels in case the parking pall should fail.

... In this position the chain will be tight across the top and all of the slack will be on bottom. When you remove the chain check plug oil will run out if it had the correct amount. Check the slack by lightly measuring from the check hole edge to the chain. Next, push the chain upward until it is tight and check the measurement again. Three quarters of an inch would indicate an undesirable amount of slack.

Happy Holliday Season
Have a good one and CUL.. Don S..
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  #15  
Old 01-01-2006, 11:06 AM
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JeepNOFEAR JeepNOFEAR is offline
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I already have 3/4 of an inch and if I did that test I would have even more slack, so basically what your saying is I need a new chain.

Thanks for the info
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  #16  
Old 01-03-2006, 07:46 AM
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JeepNOFEAR JeepNOFEAR is offline
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I counted the links on my chain and there are 46. I heard that this means I have the 16% overdrive and it needs a special chain. The truck this is in is used for trail riding only. I have another Q/T case and maybe it doens't have the 16% overdrive.

If I got rid of the 16% overdrive would I notice a big differance offroad?
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  #17  
Old 01-03-2006, 08:07 AM
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I say slack - I chased it for years and heard the "stripped splines" thing too, but if the splines ever were to slip, they would RAPIDLY stripo down to where there was no "go" left in your rig. Think about it....it wouldn't take long.
The popping from the T-case chain is a heavy, thunking sound.

You should be able to find a chain for less than $150 if you shop online - try buildyour4x4.com
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  #18  
Old 01-04-2006, 05:11 AM
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JeepNOFEAR JeepNOFEAR is offline
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I found out I have a 16% OD in my other transfercase too, woohoo .

I was woundering if maybe anyone wanted to trade kits or what parts I would need to turn my OD part time kit to a normall parttime kit?

Jode and Flint thanks for the sites

[ January 04, 2006, 12:12 PM: Message edited by: JeepNOFEAR ]
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  #19  
Old 01-05-2006, 12:39 PM
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Quote:
Originally posted by JeepNOFEAR:
I was woundering if maybe anyone wanted to trade kits or what parts I would need to turn my OD part time kit to a normall parttime kit?
If no one wants to trade, contact Milemarker and see if they will sell you just the parts you need.
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  #20  
Old 01-05-2006, 03:39 PM
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I did and they said I have to buy it from a vendor. So far its $178

[ January 16, 2006, 10:49 AM: Message edited by: JeepNOFEAR ]
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