1997 Grand Cherokee: Slipping and Hard Shifting when Transmission gets Wet - JeepForum.com

 
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post #1 of 11 Old 12-19-2011, 08:17 PM Thread Starter
NewfieGC
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1997 Grand Cherokee: Slipping and Hard Shifting when Transmission gets Wet

The transmission on my 1997 Jeep Grand Cherokee works smoothly without any problem on dry days. Its also fine on rainy days .... until I drive through a puddle and the underside is sprayed with water.

At that point, it will slip, and then start to hard shift and seem to be working in the wrong gears (while making aweful noises) . Usually it goes away in a few minutes. Last weekend when driving in slush, this started again and the transmission did not start to work properly even after I got it home.

So I towed it to a local mechanic. He looked at it and really didn't seem to want to get into it. He said that the tramsission was failing and he thought it was internal. He did not do a diagnostic. The fluid level is fine and the fluid is a new pink red colour. The whole transmission is encased in steel so water cannot be getting into it.

After hearing that the transmission was written off, I went to pick up the Jeep at the mechanics shop and when I drove away, the transmission worked again - smoothly shifting and perfectly on time.. Whats going on? Its directly related to something getting wet as the issue occurs immediately upon being spashed with water. Its been doing this for a year. Any help greatly appreciated.

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post #2 of 11 Old 12-19-2011, 08:23 PM
Degra101
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I have this issue too with big puddles, But with mine it just plane old doesnt want to shift, it lasts for a few minits.
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post #3 of 11 Old 12-20-2011, 02:40 AM
93zjbums
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sounds like you might want to check the electrical coming down to the transmission, sounds like its no longer waterproof and shorting out....

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post #4 of 11 Old 12-20-2011, 04:35 AM
PolkaPower
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When the gov pressure sensor and solenoid start going bad it will shift funny. Sometimes it will throw a code and sometimes not. Just a possibility.
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post #5 of 11 Old 12-20-2011, 05:28 AM
cdaniels85
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Quote:
Originally Posted by PolkaPower
When the gov pressure sensor and solenoid start going bad it will shift funny. Sometimes it will throw a code and sometimes not. Just a possibility.
x2 on that. When my solenoid went there were a couple of odd shifts then boom, no 1st gear or OD. I never had a puddle issue since it was a dry day. Though your description makes it definitely sound electrical.
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post #6 of 11 Old 12-20-2011, 08:19 AM
4Slow9erHybrid
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It must be an electrical issue. The governor pressure solenoid and sensor is one possibility as mentioned above. But it should not be effected by puddles. The wiring from the solenoid exits the tranny on the top through a connector. My guess would be that you have a problem at that connector, perhaps the wiring is damaged, salty water affects the signals... Hard to tell.

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post #7 of 11 Old 12-20-2011, 07:05 PM Thread Starter
NewfieGC
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Thanks everyone... The mechanics think I am nuts and say that everything looks fine on the outside.... But I know for sure its a water issue.... I even pull over as soon as I hit a big puddle because I know its will be slipping and I usually is... In spring and summer, it takes about a minute to recover. Its been doing good for the last several days.... Ill be damned if it is ever figured out.
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post #8 of 11 Old 12-20-2011, 07:07 PM Thread Starter
NewfieGC
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I forgot to say... the mechanic did do a diagnostic but no codes came back...but it was working fine at the time.
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post #9 of 11 Old 12-20-2011, 11:00 PM
93zjbums
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have it secured by straps and on jack stands and spray the bottom with a hose while do a diagnostic.my 2 cents

93 zj laredo 4.0 with k & n intake 2 inch bb skyjacker shocks and 31 bfg at
92 chevy cheyenne 4x4 w/t with 32in procomps "The Beast" 184k
92 honda accord ex
92 xj stock 358k miles wifes
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post #10 of 11 Old 12-21-2011, 01:07 AM
Candymancan
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Get a few spray bottles, and start squirting things and take a drive until you find it

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post #11 of 11 Old 12-21-2011, 05:17 AM
01xjltd
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you could be a bit pre emtive and remove each plug going into the transmission case and dab a bit of diaelectric grease on the pins of the connector and snap it back on as this will waterproof them and help restore contact.you can get diaelectric tuneup grease at any parts store.
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