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Old 01-28-2009, 08:49 PM   #1
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Cold manual transmission is pissed!!!

hey guys,
I live in the northeast and it has got to be one of the coldest winters I can remember. My 95 is a bit tempermental to the cold and when I shift from 1st to 2nd it grinds....and while I coast in 4th it will pop out of gear. Now, after it has warmed up for about 5 miles all is good.....any ideas?

Just a thought....one night it hit -17 and the damn thing wouldn't shift at all..like the fluid froze.

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Old 01-28-2009, 10:32 PM   #2
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possible synchro going bad. but i had some luck running thinner fluid in my old manual trans when it acted like that, actually exactly like that. also change the fluid cuz maybe there's water/moisture in it.

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Old 01-29-2009, 09:31 AM   #3
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This may sound crazy, but what the heck! I live in PA and we have had a good bit of cold too. I have noticed that the rubber shift boots get as hard as plastic when it's real cold. I am thinking some of my shift issues are coming from the stiff boot putting pressure on the shifter. Again, after things are warmed up, the boot gets a little more flexible and I do not notice the problem.
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Old 01-29-2009, 09:37 AM   #4
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Replace the boot. Yours is how old? I can imagine that under harsh conditions (heat and cold) that the rubber will lose elasticity and become harder to manipulate. My old boot was in good condition until I tried to move in when it was too cold. My new boots are fresh and moist and are very flexible even in the cold, but they're less than 2 months old.
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Old 01-29-2009, 05:45 PM   #5
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As for the original post is it a four or six cylinder? My friend had a for cylinder and he had the same problem, after the winter it got even worse come summer. It got to the point that it would get stuck in gear and no matter how hard you pulled on the shifter it wouldn't come out. He ended up just scraping the trans and getting a used one and getting rid of the jeep. I've also experienced the same problem with the extreme cold lately I figured it was just the gear oil being so cold. I'll have to look into replacing the shifter seat. The first time I had it happen I could find neutral so I had to hold the clutch until it warmed up. Its a weird feeling so now I just leave it out of gear for the next morning.
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Old 01-29-2009, 06:15 PM   #6
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Ive got the factory trans and havent had any issues even on the days it hit
-30 the night before, so it might just be your guys trans' Ive never had an issue
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Old 01-29-2009, 09:38 PM   #7
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I think i will try to cheap step first of perhaps running thinner fluid through it...but what type of fluid? As for the boot....hard as a damn rock in the cold. I will change that when the weather gets past "Oh $%it it's cold" degrees.

The tranny was rebiult about 30K miles ago and it only acts up on really cold days. when the weather gets above freezing it's completely fine.

Thinking about changing out the 4 banger for a 4.0 which will require a tranny upgrade anyway..lol
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Old 01-30-2009, 11:32 PM   #8
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It could be you just need to flush your trans fluid you might have just enough water in there to freeze and screw with the internals
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Old 02-13-2009, 12:59 PM   #9
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cold shifting problems

I have learned from experience that the original trans oil in a 94 jeep wrangler is much thinner than regular gear oil. After doing an oil change it was almost impossible to do a shift fron 1st to 2nd when cold, but was ok after it warmed up. You also must be careful about gl5 oil, it eats snchro's (eats yellow metal) several oil company sites warn you of this., learned that the hard way also. I have had great luck running GM snchromesh oil it has made cold weather shifting much easier. don't know what it will do this summer though.
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Old 02-14-2009, 09:16 AM   #10
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Mine did the same thing when I use run it in the winter,I flushed it and then ran synthetic oil. did help. getting the moisture/water out what really helps.
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Old 02-23-2009, 11:25 AM   #11
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Chnaged out the tranny fluid and now it's all good. was pretty cold this morning and had zero problems shifting and it was nice and smooth!!! Thanks for the help guys!!

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