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Unread 11-09-2012, 11:00 AM   #1
Jaspah
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2002 WJ 
 
Join Date: Oct 2012
Location: Hamilton, NY
Posts: 249
Hard/rough shifting

Hi guys, been lurking for just over a month now, but this is my first time actually posting here.

I bought a 2002 Grand Cherokee Laredo, 4.0, with 138,000 miles on it. It's in pretty good shape, especially for being in the Syracuse, NY area (salt city). It drives fine-- no slipping or anything like that, however, while driving (around 2000 RPM) if I put my foot to the floor it will shift hard like a jerking motion. None of the other gears shift no where near as hard as that one does. Otherwise, everything else about the Jeep has been great so far. We checked the transmission fluid (following instructions in the handbook) and it was at the correct level.

I don't normally "floor" it, but occasionally on hilly roads the cruise control will throw it into that gear anyway, and you can really feel it on hills.

There is also a very slight vibration while idling and in first gear, but nothing serious.

Is this the precursor to a more serious problem with my transmission?

Thanks guys.

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Unread 11-09-2012, 11:41 AM   #2
K10roc
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if you crank sensor is failing it can give hard shifts... you getting any check engine light? any codes? when did you last change the fluid
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Unread 11-09-2012, 12:14 PM   #3
Jaspah
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Ah, I forgot to post that I did not get any codes. The check engine light is not on, and the nothing is reported on the key ignition trick.

I'm not sure when the transmission fluid was last totally replaced. I remember reading in another post that completely changing to new transmission fluid with higher mileages can do more harm than good. Like I said, it read normally when we checked it.

Should I have it changed just to know when it was last done? Are there really any serious cons to that?
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Unread 11-09-2012, 01:43 PM   #4
mKosel
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Join Date: Aug 2012
Location: Fargo, ND
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well...i was gonna say it could be a transmition module/sensor but sense your check engine isnt on, i would say it could possablly be your U-Joints. U-Joints can were out, and when they do, it makes for god awful gear changes... This same thing happend to me. when you find out for sure, be sure to let us know what it was!

Good Luck
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Unread 12-16-2012, 02:02 AM   #5
SkinnyBam
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Did you ever figure this out? I have a similar problem when accelerating hard, usually while going uphill on the highway. It makes a jerk and sometimes the rpms will shoot up, forcing me to let off the gas to let it shift. If I accelerate gradually I dont have the problem.

I have a little over 100k on mine as well.
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Unread 12-16-2012, 11:26 AM   #6
MuddyWJ
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Quote:
Originally Posted by SkinnyBam View Post
Did you ever figure this out? I have a similar problem when accelerating hard, usually while going uphill on the highway. It makes a jerk and sometimes the rpms will shoot up, forcing me to let off the gas to let it shift. If I accelerate gradually I dont have the problem.

I have a little over 100k on mine as well.
I have the same issues. Just ordered new joints from rock auto. I'll post results once I get them in.
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Unread 12-16-2012, 12:38 PM   #7
Jaspah
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Quote:
Originally Posted by SkinnyBam View Post
Did you ever figure this out? I have a similar problem when accelerating hard, usually while going uphill on the highway. It makes a jerk and sometimes the rpms will shoot up, forcing me to let off the gas to let it shift. If I accelerate gradually I dont have the problem.

I have a little over 100k on mine as well.
Not yet. I've been at school so I haven't had much time to look into it. I just got home a few days ago and I'm going to see if I can get someone to take a look at it.
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Unread 12-16-2012, 04:08 PM   #8
SkinnyBam
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Quote:
Originally Posted by MuddyWJ View Post
I have the same issues. Just ordered new joints from rock auto. I'll post results once I get them in.
Sounds good thanks!
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Unread 01-18-2013, 09:57 PM   #9
MuddyWJ
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I'll be putting the new ujoints in next week. Hopefully it alleviates the issue. I'll post when done.
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Unread 01-19-2013, 12:08 AM   #10
Gunrunner23
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Transmission speed sensors can cause crap shifting and not throw a code. Bad shifting can be from worn motor mounts, to drive shaft, to joints, etc.

First thing you should do when buying any used car is changing all fluids. Who knows when they were last changed. The dealer can say they did it, but who really knows.

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Unread 01-31-2013, 06:05 PM   #11
MuddyWJ
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I just drained half a quart of trans fluid and it shifts like butter now.
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