Is it true trannies won't shift into OD when too cold? - JeepForum.com
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Unread 01-07-2010, 06:22 PM   #1
crashcraddock
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2000 WJ 
 
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Location: Moore, OK
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Is it true trannies won't shift into OD when too cold?

I think I've read this once upon a time. This problem is getting old, my WJ takes forever to shift into OD when it's cold outside. I'm OK in the morning because the Jeep stays in the garage, but at lunch or after work I can go 10 miles on the intersate before it finally shifts in to OD. I'm not doing any damage because of this am I?

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Unread 01-07-2010, 06:34 PM   #2
WahooCreek
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I am having the same issue with my 2000 wj, and like yours, mine will not kick into OD until about 8 miles or so. No answers for you. Just wanted to let you know there's another one out there with the exact same problem.
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Unread 01-07-2010, 06:35 PM   #3
02Lightning
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I think it's 30 deg. before it will shift but it should get to that temp in less than a mile?
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Unread 01-07-2010, 06:42 PM   #4
GrandLaredoWJ
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Mine does this same thing here in MN, (Right now 8 below zero), I usually have to drive for about 5 miles or so before it shifts. The reason for this is because when it is cold out the transmission fluid gets thicker.
Therefore making it harder for the transmission to pump it through to get it into overdrive until the fluid is warmed up enough. And no, you are not doing any damage to your transmission because of this, no worries.
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Unread 01-07-2010, 06:45 PM   #5
GrandLaredoWJ
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Quote:
Originally Posted by 02Lightning View Post
I think it's 30 deg. before it will shift but it should get to that temp in less than a mile?

Also forgot about that, that is correct. but mine needs to get to WAY more than 30 degrees before it shifts.
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Unread 01-07-2010, 06:54 PM   #6
crashcraddock
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I should mention my wife's 00 WJ V8 has Royal Purple tranny fluid in it and it hardly ever has this problem, only when it sits outside for a whole day. My 99 WJ V8 has Valvoline ATF in it and it experiences this problem more frequently.
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Unread 01-07-2010, 07:01 PM   #7
comptiger5000
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It could be based partly on pressure as well, so that if it determines the fluid is too thick via temp or pressure, it won't shift to OD. My suggestion is to warm it up in Neutral with the E-brake on (as long as it's on mostly flat ground and the E-brake works). That will allow fluid flow through the tranny (and the cooler in the radiator), so it will start to warm up a little before you start driving.
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Unread 01-07-2010, 07:05 PM   #8
crashcraddock
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Quote:
Originally Posted by comptiger5000 View Post
It could be based partly on pressure as well, so that if it determines the fluid is too thick via temp or pressure, it won't shift to OD. My suggestion is to warm it up in Neutral with the E-brake on (as long as it's on mostly flat ground and the E-brake works). That will allow fluid flow through the tranny (and the cooler in the radiator), so it will start to warm up a little before you start driving.
Sounds like a plan to me.
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Unread 01-07-2010, 07:24 PM   #9
Falkon
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In the original owner's manual for my 2004 Limited, it states that the trans will not shift into overdrive til it warms up. Perfectly normal. Mine does this also.
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Unread 01-07-2010, 09:19 PM   #10
JesseOR
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It is normal. Its in all owners manual. Its not the operating temp of the engine, its the temp of the trans.
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