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Unread 07-06-2012, 07:13 AM   #1
acurrier2012
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Detroit Locker

My 01 Cherokee has Detroit Lockers. When i put the jeep into either reverse or into drive, a big "thud" happens. Is this the Detroit Locker "locking in", or should i be worried?

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Unread 07-06-2012, 07:22 AM   #2
KingtheZJ
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how big is the thud?
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Unread 07-06-2012, 07:25 AM   #3
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I hope it isnt as big as his text is...
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Unread 07-06-2012, 07:26 AM   #4
KingtheZJ
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that could be a big thud
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Unread 07-06-2012, 07:50 AM   #5
acurrier2012
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Ya didnt mean to do that text.. Its not crazy big, but its noticeable. Is that normal? If not, what should be looked at? New to Jeeps.
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Unread 07-06-2012, 07:54 AM   #6
KingtheZJ
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haha we're just messing with you.

ive never seen a detroit locker in action, but it is supposed to be a "soft locker". i wouldnt expect it to thud too much. check suspension parts for paly
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Unread 07-06-2012, 07:58 AM   #7
acurrier2012
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Probably should get it checked out. Thanks for the info.
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Unread 07-06-2012, 08:06 AM   #8
Technohead
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In 2wd or 4wd (or both?)

Are you sure they are Detroit lockers? I have a Detroit locker in my rear axle and it is virtually unoticeable . . . except when I need traction in which case it works magic!

My suspicion is that you have lunchbox lockers such as Aussie or Lock-Rite which can be quite noisy.
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Unread 07-06-2012, 08:12 AM   #9
acurrier2012
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Mostly just in 2wd, but sometimes in 4wd.

I am positive i have Detroit Lockers, but i am not positive that thats what the noise is. Several people told me that may cause it, but it still has me wondering.
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Unread 07-07-2012, 07:25 AM   #10
fbv193
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When I first installed the Detroit Locker in my YJ, the first thing I noticed was a "thunk" when putting in gear, either forward or reverse. By its nature, an automatic locker such as the Detroit has a bit of rotation or "slack" in the ring gear before axle shafts are turned, as opposed to an open or LS diff. I dont think about it any more, but it is still there. I suspect that is what you are hearing, the ring gear and carrier rotating and then abruptly stopping as the slack is taken up.
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Unread 07-07-2012, 08:26 AM   #11
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If its a full case locker then yes it will clunk when it locks and un-locks.

Jason.
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Unread 07-09-2012, 07:06 AM   #12
acurrier2012
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Thanks for the info guys. Looks like ill just leave it how it is.
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Unread 07-09-2012, 07:06 AM   #13
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I don't think the Detroit is the cause.
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Unread 07-09-2012, 07:09 AM   #14
acurrier2012
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What would you suggest?
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Unread 07-09-2012, 07:32 AM   #15
SLADE
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Transmission.
ring/pinion slop.
Axle wrap.

Have someone shift it from forward to reverse while you watch undernieth it and see what you see. You need to better narrow down your problem and where the noise is coming from.

Ive had a few Detroits and Ive never heard them make any noise when shifting from forwards to reverse. They typically unlaod (thud) when they are on a bind (turning). I'm not saying that it is not the Detroit, but it will be in your best interest to rule out all the other possibilities.
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