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Old 01-01-2008, 09:17 PM   #1
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Reverse Clunk

I haven't done any inspecting yet but just want to get a few ideas on what might be happening.

97 / 4.0 / Auto / D35 / 32"s / SYE / 3.5" RE Lift / Adjustable Upper Arms front & rear

After I put the TJ in reverse and back up I get a pretty noticeable clunk when the brakes are applied. It will only do this in reverse. If I put it in drive and head down the driveway, and then go in reverse for a couple of feet it will do it again.

I don't think its the pinion popping up as that would happen when I put it in reverse. I was under there last week tightening up the track bar and sway bar links and nothing else felt loose to me. The drive shaft and all control arms were tight along with the rear track bar, although I might need to re-grease everything again sometime soon. I read somewhere about the D35's LSD making noises and am hoping that is not the issue. And the only other thing I can think of is possibly one of the break drums moving, but I don't get the noise when going forward and stopping.

Any insight?

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Old 01-01-2008, 09:26 PM   #2
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Hmmm........... mine does this occasionally, I'd like to know this also.

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Old 01-01-2008, 09:59 PM   #3
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first if you have a locker it is that, but if not it is probabaly somwhere in the diff
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Old 01-01-2008, 10:26 PM   #4
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Did you not read it? I didn't post anything on a locker, and only mentioned on D35 LSD's.

Although my D35 does have an LSD.
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Old 01-01-2008, 10:33 PM   #5
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Quote:
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Did you not read it? I didn't post anything on a locker, and mentioned D35 LSD's.
..................and some threads get filled with absolute nonsense tech just like that. I'd rather have a thread hijacked than filled with bad tech.
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Old 01-01-2008, 10:44 PM   #6
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well for one 4point never specified and second isnt a lsd a type of locker?
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Old 01-01-2008, 10:50 PM   #7
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Old 01-01-2008, 11:08 PM   #8
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Az Does it have the Clutch pack type that may be what your hearing it loading and then pop un loading. I'm no expert but that may be all.
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Old 01-01-2008, 11:29 PM   #9
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The factory "Trac-Loc" LSD does have clutches, but it doesn't lock up, so that shouldn't be the reason.
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Old 01-02-2008, 02:18 AM   #10
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Not exactly sure but it kinda sounds like a bad u joint to me. My old zj had bad u joints and when i put it in reverse the u joint would clunk under the load...
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Old 01-02-2008, 02:45 AM   #11
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But I only get the clunk hitting the breaks in revers. Thats the confusing part. I'm still gonna inspect tomorrow.
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Old 01-02-2008, 03:28 PM   #12
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Az, you might try removing your rear driveshaft and then testing it out. If everything seems fine there then start inspecting your control arm bushings in the rear.
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Old 01-02-2008, 04:05 PM   #13
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I was screwing around this morning and noticed that the rear trac bar was hitting the stock gas tank skid. The skid was munched a little and pushed up and bent out right about where the track bar is.

I also notice that my tranny mount is wearing out allowing the t-case to hit the skid sometimes. So with those two issues, I think my problem is solved.

Jack - bushings are all good. Nothing is torn or ripped.
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Old 01-02-2008, 04:09 PM   #14
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Quote:
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I was screwing around this morning and noticed that the rear trac bar was hitting the stock gas tank skid. The skid was munched a little and pushed up and bent out right about where the track bar is.
I'll check mine. I was thinking mine is the CA's or one of them. Hopefully my new ones show up this week. I'll check it then.
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Old 01-02-2008, 04:20 PM   #15
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Yup, that's why some flip their rear trac bar over to keep it from doing that. I haven't had a rear trac bar for years so I forget about some of those things.
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Old 01-02-2008, 04:24 PM   #16
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Yeah I kinda figured Jack.

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