Last post on May 06, 2013 at 11:26 AM
You are in the Jeep Cherokee and Jeep Grand Cherokee
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Jeep Grand Cherokee, SUV
#871 of 1066 2001 jeep tranny problem
Oct 23, 2011 (4:01 pm)
I have a 2001 jeep grand Cherokee Laredo 4wd 4.7L v8 with 107,000 miles when it shifts from 2nd to 3rd at lite or normal throttle it shifts hard but if you are accelerating hard it shifts fine the transmission is a 45RFE the hard shifting is after i have drove it for 20 miles or so the temp is around 190 top 200 2nd question is there a check engine light or is there just check gages & trans over temp lights
#872 of 1066 Re: 2001 jeep tranny problem [2001jeep1]
Oct 24, 2011 (10:09 am)
set of solenoids inside trans one probably sticking
Oct 24, 2011 (11:38 am)
#874 of 1066 Re: Yep [handsomerob]
Oct 25, 2011 (7:15 am)
does the solenoid come in a kit or singels and thank you all for the information i hope it works i will try it along with changing fulid and filter
#875 of 1066 O/D kicks off on highway
Nov 01, 2011 (5:08 am)
Does anyone have a solution to an Overdrive lock out while on the highway? I have a 2002 grand cherokee with 2wd. It has 140,000 miles on it. operates fine normally but after about 30 minutes on the highway around 70 mph it drops out of O/D into 4th gear. The O/D off light comes on but not the transmission temp light. I do not believe this is because of a high temp. Although it does not do this when the jeep has cooled down. If I shut down for 30 minutes it goes away until the temp comes back.The fluid level is normal and condition of fluid is good. Not sure where to check first. Any help would be appreciated, thanks-Mark
#876 of 1066 Re: O/D kicks off on highway [madmariner72]
Nov 01, 2011 (10:01 am)
Hi,Sounds like we have similar problems. My 2001 Grand Cherokee drops out of top gear/overdrive down into 3rd gear when the engine reaches running temp. The diagnostics equipment has said it is the throttle positioning sensor and a new one has been ordered and should be fitted tomorrow! If it answers the problem I will get back to you right away!
#877 of 1066 1999 Grand Cherokee Tranny surges
Nov 04, 2011 (8:41 am)
hey, I have a 1999 Grand Cherokee 4.7, and I recently had someone replace the radiator, and since then whenever I first start the car and drive, hot or cold, it seems to have a high rev when first going, and then it subsides after a bout a quarter mile, it revs up to 2k rpm and then acts normal, through the rest of the trip,even at stoplights. I told my friend about it who replaced the radiator, and he said it may be not enough coolant or that there may be air in the cooling system, but I check all that, and he also said to make sure that the tranny fluid is high enough as some came out but not a lot, and it seems fine too, but there were bubbles in the tranny fluid so i added a little more, bout a half quart as i am not sure why it would only do this when I first start the car and drive. It has never done anything like this before, so could it be not enough tranny fluid, air in the tranny, or????
#878 of 1066 Re: 1999 Grand Cherokee Tranny surges [malbeck]
Nov 04, 2011 (11:36 am)
There is some issue with the transmission cooling lines and/or the cooler portion of the radiator.
I have a 97 Jeep. The transmission was acting funny. It was surging a lot. Next, the water pump went. So I decided to replace the pump so I could drive it to transmission shop so I could at least get a rebuild quote.
I noticed the transmission cooler lines were leaking. So, I decided to replace them while I was under there.
Guess what? The transmission problems went away!. My theory is that any issues with transmission cooler lines somehow affects the pressures inside the transmission.
If you really like the car, here is what I would do.
1. Disconnect fluid lines at cooler.
2. Get fluid out of the cooler
3. Find out what pressure the trans cooler should be tested at and test it
4. If pressure test not OK, talk to a transmission shop before you go back to the mechanic or where you bought the new radiator.
5. If pressure test OK, replace both transmission cooler lines and test drive.
NOTE: The trans cooler lines should be bone dry
You may need a special tool to disconnect trans lines at the cooler.
After working on it follow procedure for adding fluid. If the fluid level is low it will act funny.
#879 of 1066 Re: 1999 Grand Cherokee Tranny surges [rwengr]
Nov 07, 2011 (1:01 pm)
I will check the lines and see if there was any damage done to them. I keep hearing about it may take a special tool to remove the tranny cooler lines when doing a new radiator install, but when this "guy" took them off he just used a wrench, could he have damaged the lines by taking them off and putting them back on wrong? The tranny fluid is fine, and so is the coolant levels, it just revvs along at 2k rpm's until you get about a 1/4 mile then kicks in. Seems that there is a pressure issue somehow that was not there before the swap out. Could the radiator cause this? It's a new aftermarket, and I have had no overheating issues either, just once when we were putting in coolant, but the car was not driven it just overheated initially as the coolant was not circulating properly after we put it in the radiator, and then we put the coolant in the bleed hole and it was fine. Could something have gotten wet from the steam/coolant coming out when we had to bleed and put coolant in? I am sorry for all the questions, but I am stumped as to what is causing this to happen, and only when I start the car hot or colds.
#880 of 1066 Re: O/D kicks off on highway [madmariner72]
Nov 11, 2011 (6:00 am)
Finally I got a good result! As my first message stated the 2001 grand cherokee would drop out of top gear/overdrive once it reached running temp. Many checks were done and to no avail. Sticking solenoids in the tranny was suggested and perhaps may be the case in other vehicles however turns out that in my case it was diagnosed as the output speed sensor, a $40 part. A new one was ordered however on fitting it it was found that it was the connector to the output speed sensor that was at fault and a recrimp sorted that out! six weeks of hassle and thoughts that a new tranny may be needed and it turned out a basic connection! I hope your problem is as simple to fix and it sounds identical to mine.