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Old 12-02-2007, 04:41 PM   #1
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So the knock has evolved.

So I took the Jeep out a few minutes ago, expecting it to be doing the 'pop' I talked about in this thread. http://www.wranglerforum.com/yj-chat...top-13680.html
So I was driving, and downshifted into 2nd. I heard a horrible grinding noise so I put the clutch in, and hesitantly tried 3rd gear. It worked, so I stopped a tiny bit up the road, shut it off, and looked over the wholething. Couldn't find a thing wrong with it that I could see, so I turned around and started driving home. I was driving it like a grandma, and came to a hill, went do downshift into 2nd and it wouldn't go. I tried 3rd, just to see if it would go in any gear, it did, but was verryy bogged because of the hill, so I tried 2nd again, and it worked. I drove it home, called a buddy and explained it, he didn't really know, so I took it for another spin around the block to see exactly what the problem was. When I let off the gas when I am driving in gear, I hear the same grinding noise. I looked under the hood for anything wrong; but I couldn't see anything. I felt underneath, everything felt solid. I layed on the ground and tried to basically benchpress the transfer case and tranny seeing if I could get it to move at all out of the ordinary. Everything felt fine. What could be wrong???

*edit* If anyone was wondering, the grinding when I decelerating off the gas is in any gear, not just 2nd. Well I think any gear. 2nd and 1st, so probably the rest, too, but it could be those 2 gears of the tranny are messed up, but I don't think thats what it is.

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Old 12-02-2007, 04:53 PM   #2
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I was told in the other thread that the pop I hear on takeoff is probably from a messed up tranny or motor mount. Could that cause this problem, too? Thanks guys

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Old 12-02-2007, 06:41 PM   #3
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I searched some more and found a thread with something similiar it seems like. http://www.wranglerforum.com/tj-chat...oise-7404.html The last post the guy says it could maybe just be basically empty on tranny fluid? I just got the Jeep recently and haven't changed the fluid, so I don't know how much is in there. Is this a possibility? Anyone help? This is my only ride to work!!
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Old 12-02-2007, 08:37 PM   #4
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I see the thread got a bunch of views but no one knows whats up? I know I've replied too many times but I get really weird over stuff like this. Its my daily driver and I have no clue whats wrong.
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Old 12-02-2007, 09:05 PM   #5
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did you check tranny fluid? is it all burnt up or clean looking? i'd drain and fill new just to try something. look for metal in the fluid as well. does the grinding sound like an automatic that gets dropped into park while moving forward<- a LOUD, DRY sounding grinding, almost like a clack?
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Old 12-02-2007, 09:08 PM   #6
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sorry man, i dont have much else to offer. you might check your u joints, ive heard them clunk like that when they're hella-shot. fwiw, when the tranny mount goes, its the twist action that facilitates the clunk, i know you said you benched it, but try to twist it also, JIC
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Old 12-02-2007, 09:08 PM   #7
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Thanks Fels. Yeah, the grinding does kinda sound like you described it. I could feel a lot of the vibration in the shifter, too. I'll give it a shot with the tranny fluid, can anyone else think of anything? Thanks
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Old 12-02-2007, 09:08 PM   #8
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dont worry i get wierd about chit 2. specially about my rig.
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Old 12-02-2007, 09:10 PM   #9
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craigs list under $500.00 <- fastest solution.
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Old 12-02-2007, 09:13 PM   #10
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sorry man, i dont have much else to offer. you might check your u joints, ive heard them clunk like that when they're hella-shot. fwiw, when the tranny mount goes, its the twist action that facilitates the clunk, i know you said you benched it, but try to twist it also, JIC
I know all of the rear u-joints are new, so maybe its the front. I'll give them a check. Should I just try to move the front driveline and see if theres play in anything to check the U-Joints?

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dont worry i get wierd about chit 2. specially about my rig.
Yeah I get anxiety and paranoid and all kinds of bad stuff when I get car problems. Its no fun.
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craigs list under $500.00 <- fastest solution.
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Old 12-02-2007, 09:21 PM   #11
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i found two direct swap trans on craigs list for my jeep for under $500.00 mine cuz it is currently a piece of garbage was only $200.00 i found 3 ax15 for under 500, one was 1100.00 cuz it came w/ a bunch of other stuff. but that sound sounds like a worn or broken gear on your second gear. what trans is in the tj? were yj here so i dont know off hand? the two options i know of for yj's are ax5's and ax15's
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Old 12-02-2007, 09:22 PM   #12
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chit you are a yj,... different thread i was talkin to... anyway you probably have an ax15 right? you got a 4.0 right?
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Old 12-02-2007, 09:24 PM   #13
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It's not just second gear that does it. It did it in first, too. The tranny has never given me problems other than the occational grind which was probably a combination of me and clutch pressure not being great due to at least a leaky master cylinder.

Yeah I have a YJ with a 4.0. Most likely ax-15 as that is stock.
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Old 12-02-2007, 09:44 PM   #14
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call in sick, take it to a mechanic. we could throw chit at you all day..like the syncro springs, cluster gear,blown gear bearing. the only quick fix is direct replacement. and with the ax15 its almost cheaper.
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Old 12-02-2007, 09:46 PM   #15
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Yeah I already planned on taking the day off cause I don't want to drive it to work how it is, but I'll give the mechanic a call and see if I can bring it to him. That is expensive so I want to avoid that if I can, but its looking like its my only option.
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Old 12-02-2007, 10:10 PM   #16
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srry bro wish there was an easy button, but let us know what he found. how wrenchie are you? cant you get one from the junk yard and put it on? anyway hope its something simple...
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Old 12-02-2007, 10:14 PM   #17
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I am wrenchy if you wanna call it that, me and a buddy put a header on my Wrangler and that wasn't the easiest thing to do. So what makes you so positive this is a tranny that I absolutely need to replace?
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Old 12-02-2007, 10:14 PM   #18
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if you're not locked in the fornt, your front shaft shouldnt be turning (i think all yjs had CAD) so it shouldnt be the fornt shaft.

i dont know much about the internals of a trans, so im not sure what it could be insde there. usually a synchro will make it hard to get into gear, but shouldnt cause noise while its IN gear.

did you say it was fresh fluid? if not, you could change it, just to see if theres any chunks coming out.....
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Old 12-02-2007, 10:16 PM   #19
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I have no clue how fresh the fluid is, or even how much there is, for that matter. I have never changed it, I just got the Jeep recently, but I saw quite a bit leaking out when I had it on its side, and I never got around to filling it back up, or changing it. I should have. Maybe it just has no fluid?
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Old 12-02-2007, 10:24 PM   #20
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i would most def drain and refill. i did mine the other day for the first time ever and there was more shavings than i liked, but ill just keep driving it till it grenades. i would try that first, b/c its cheap and easy. keep ur fingers crossed that if it WAS too low, no damage was done.
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Old 12-02-2007, 10:26 PM   #21
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I'll definately do the fluid tomorrow and see how that does. While I'm under there I'll really double check everything before I take it to a shop. I'm broke as it is.
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Old 12-03-2007, 10:43 AM   #22
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So yall think that it could just be a lack of fluid? No one has any other suggestions as to what it could be? I am stumped, and I hate this feeling of not having transportation. I need to fix this! I will do the tranny fluid today and see if that makes a difference. It just sucks we are just starting to get a rain storm, and I have no garage to work on my junk with. I guess its gonna be a wet cardboard on the ground day.
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Old 12-03-2007, 02:36 PM   #23
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So since I didn't go to work today, and its my payday, I won't have the money to go buy the tranny fluid for another couple hours when I can borrow it, so that is going to have to wait a little while. No one has ANY idea what else this could be? I'm freakin out!
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Old 12-03-2007, 03:36 PM   #24
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It's either that your trans is toast, or it's low on fluid, what else can anybody tell you? Until you try the fluid, you can't rule that out, but if you do refill and it still does it, the remaining options all involve pulling the trans, so you might as well plan on a swap and rebuild what you have now as a spare. I'm sorry there isn't an easy button on this, but it is what it is, now you just gotta tackle it head on.
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Old 12-03-2007, 03:56 PM   #25
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Thanks sgnellett, I'm just trying to see if anyone has experienced the same thing and maybe has an exact answer for me.

I just drove it down my street a bit, and back home, just to see if I could pinpoint the sound. It really almost sounded like the front differential, maybe? The tranny felt OK, goes in and out of all gears fine, and only makes the noise when I am decelerating with it in gear, and the clutch not in. I could also hear a slight grinding noise when I was backing out of the driveway. It is very likely that the front diff is messed up, considering I drove on just the front driveline for what the odometer said was 2200 miles or so. I know, I am an idiot, but I had to get to work. Any more input, guys?
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Old 12-03-2007, 04:16 PM   #26
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Just thought about it, is the front ring and pinion even turning when I drive in 2wd, or can I eliminate that from the list?
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Old 12-03-2007, 04:43 PM   #27
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I called a few places: A Jeep specialist around 15 miles away from me, who said it could be the front ring and pinion, or bearings in the front diff. But I think it was their secretary I was talking to. I called another place, a Transmission shop in my town, and the guy told me it is the transmission. He made that decision after I told him that the sound stops when I put the clutch in, which makes sense. I don't even wanna spend money on tranny fluid for this tranny just to find out this one is crap and I need a new one. Anyone have any more ideas? Should I just start pulling the tranny and looking for a new one?
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Old 12-03-2007, 05:33 PM   #28
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i would invest the 25 bucks for tranny fluid before i went to the trouble of pulling it, or at least the 25 bucks to open up the front diff and see what that fluid looked like.
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Old 12-03-2007, 05:43 PM   #29
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But since neither the front driveline nor the front ring and pinion are spinning when I am driving in 2wd, and when I put the clutch in the noise stops that pretty much rules out the front differential as causing the noise, doesn't it?
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Old 12-03-2007, 05:43 PM   #30
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Check all of your fluid levels first

tranny
transfercase
both diffs

make sure they are full and pay attention to the plug and color of the fluids, sometimes you will see metal shavings and that may help you narrow down the problem.

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