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Unread 07-28-2012, 11:45 PM   #1
Slivs18
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2008 WK 
 
Join Date: Jul 2012
Location: Hull, MA
Posts: 10
3.7 Tuneup Advice

So I bought this thing last September and I'm back into full DIY mode. It's a 2008 with 60K on the clock. It was a highway vehicle before I bought it and "maintained." My dealer bought it at auction and he has been my goto guy, before you ask we are friends and have a history together so I trust him. The only problem I have with it is a intermittent rough down shift. These shifts have been very intermittent and I can't replicate them, but when they happen it sounds like I'm gonna drop my tranny, it's usually off an acceleration and a let off of the gas. Any advise would be appreciated. I told my buddy and he has been changing a quart or two of fluid at a time by sucking it out and replacing it. I've had mixed results as the banging goes away and eventually comes back. It's not alarming to me since it doesn't happen every day, but I wanna hear what you guys think. Regardless, I wanna change spark plugs (gap requirements?), full tranny fluid, maybe transfer case, oil (obviously), and anything else you guys can think of?

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2008 Silver WK Grand Cherokee/ 3.7L/ Weather Tech Mats (Both Rows and Cargo)/ Flowmaster 40 Series Delta Flow/ K & N 77 Series CAI/
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Unread 07-29-2012, 12:28 AM   #2
kllshadow
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2006 WK 
 
Join Date: May 2011
Location: Altoona, PA
Posts: 367
Don't forget the diff fluids WKJeeps.com has all the fluid part numbers and amounts needed
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Unread 07-29-2012, 10:00 AM   #3
Drew
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2007 WK 
 
Join Date: Nov 2002
Location: Marlton, NJ
Posts: 252
I've always done 30k major service intervals with all my vehicles and typically go 200k+ before parting with each of them. So IMHO your right on track at 60k. Do plugs, filter, and all the serviceable fluids.

The rough downshift your talking about on the tranny. Are you sure it's not an upshift as you let off the throttle? If you accelerate and then let off the gas it will give a bit of a "bang" shifting?
If this is what your talking about, try this. Disco the battery terminals for a few minutes and go from there. Mine will start to do this about once a year, but after discoing the battery it will be fine for awhile. I think it has something to do with the way the tranny is learning driving habits. I drive pretty hard as I use my Jeep for work so I'm pretty hard on/off the peddle. I think the tranny is just shifting quick and it will bang once in awhile when I'm not driving it so hard or when I let off the gas quick....
Doug
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Unread 07-29-2012, 10:08 AM   #4
Slivs18
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2008 WK 
 
Join Date: Jul 2012
Location: Hull, MA
Posts: 10
Thanks for the advise. Now that you mention it it has happened on an acceleration and let off as well as the downhill coast. Battery was off this week while I installed the CAI, so we'll see if that works.
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