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Unread 04-05-2015, 08:35 PM   #1
voicesny
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2007 WK 
 
Join Date: Apr 2015
Location: New York, NY
Posts: 2
Transmission fluid overfill on Nag1 3.7L help

Hi Guys, been dealing with this problem for almost 2 months now. This year i had my transmission fluid drained and replace with 4QTS. which is perfectly fine, put about 3000 miles with no problems and then had my tranny cooler line replaced and i thought some fluid was lost at the shop, so i added 1/2QT. back in, drove locally and was fine then one day i had to do 100 mile trip to philly and it started acting weird, the rpms were sticking and it just wasn't normal. Anyhow, i bought a pump and siphoned the 1/2QT. back out, and the fluid was dark, assuming overfill causes extra heat and foaming i later took the car to the shop to do a drain and fill, 4QTS. were put back, but now i feel on coldstarts the RPM hits 1500 then slowly comes down. Now my question here is does low transmission fluid also cause the RPM to be high on coldstarts? after a few seconds it starts falling down to 1000 then settles around 7-800, the normal rpm for me before overfill would be 500rpm. I have noticed that it seem like the car is louder when it starts as well. Also, received my dipstick a couple days ago and for some reason i cannot get it to read when car is running, i also took a reading before i started the car and i believe it was at 60MM, drove the car to auto zone, took another reading and i got nothing. Does this mean i am under filled now? Keep in mind that the 2nd time i had the fluids drained, i have no idea how much actually came out, it could have been more or less and i also noticed a little slipping when pulling the car out of driveway this morning but is fine once its warmed up. Any thoughts or help would be appreciated.

07 WK 3.7L
Dipstick: Dorman 917-327

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Unread 04-06-2015, 08:44 AM   #2
Nejeep
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Join Date: Jun 2006
Location: Lincoln, NE
Posts: 534
As you may know there is a temperature correction chart that needs to be used for the NAG1 transmission in your 3.7 WK. The fluid temperature needs to be checked with a scan tool in Park and on a level surface. The fluid level is critical to proper operation of the transmission. Just driving the Jeep until it is warmed up does not provide an accurate enough fluid reading, so you will need to get it checked by someone with a scan tool.
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Unread 04-08-2015, 08:37 AM   #3
voicesny
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2007 WK 
 
Join Date: Apr 2015
Location: New York, NY
Posts: 2
This Nag1 transmission is a pain in the butt, it takes very for it to under and overfill. Another question, if the transmission was overfilled in the past with 1/2qts would that have any effect on the car having a high rpm on a coldstart but slowly goes down as car warms up? i just want to rule out that the high rpm on coldstarts is in no way comnected to the transmission. Normal start up rpm was 1000, and that was in 30 degree weather and now its been in the 50-60's and starts up at 1500rpm.

Last edited by voicesny; 04-08-2015 at 03:26 PM..
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Unread 04-09-2015, 05:50 AM   #4
Nejeep
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Join Date: Jun 2006
Location: Lincoln, NE
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I have not experienced an idle speed variation related to transmission overfill, nor have I heard of that issue from others here on the forum. The idle speed is set by the ECM based on coolant temp, inlet air temps and some other inputs (AC on/off, trans engaged, etc). The idle air control on the throttle body is the device that actually changes the idle speed, so it may be getting dirty or having some other problem. I wouldnt get too concerned about the different idle speeds unless the engine actually stalls.
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grand cherokees , transmission fluid level

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