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Unread 11-12-2013, 08:00 AM   #1
JrJmisn
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2005 TJ Wrangler 
 
Join Date: Mar 2009
Location: Lake Erie
Posts: 286
*Cold* Auto Transmission Slipping

We just had our first snow, so first days of cold, under 35-40 degrees.

We just got my wife an 07 JK Unlimited X a month ago

Yesterday she reported the Jeep engine reving up but just barely crawling forward, enough that she didnt feel good pulling out into traffic. Once the temp gauge went to warm on the dash, no more slipping. I took it out this morning and it did it for me as well. Jeep would rev, jeep would sit or drift, until it felt like the clutch grabbed and hooked up.

AUTO transmission "slipping" when cold...is this a known problem? ...anyone have any ideas? We are still within our 3 month war. from the used dealer for the powertrain. ...any suggestions?

Thanks guys

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Unread 11-12-2013, 08:59 AM   #2
ronjenx
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2008 JK Wrangler 
 
Join Date: Jan 2009
Location: Maine
Posts: 3,966
Sounds like low fluid level.
Have you checked it after the trans is warmed up, with the engine idling in park or neutral?
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Unread 11-12-2013, 07:52 PM   #3
JBADV
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2013 JK Wrangler 
 
Join Date: Sep 2013
Location: barre, vt
Posts: 34
Mopar transmissions used to suffer from what we called drain back . Over night the fluid would drain out of the torque converter and back into the pan . In the morning the transmission would seen to slip until the torque converter filled with fluid . A few minutes after parking your Jeep and shutting off the engine , pull the trans dipstick and check the fluid level . The next morning , prior to starting the Jeep , check the fluid level again . Is the fluid level the same as last night ? If the fluid level is higher it could be converter drain back . Let the Jeep run for while before trying to move it , letting the torque converter refill . Sometimes a transmission flush will help converter drain back .
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