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Jeep Grand Cherokee, SUV
#859 of 1101 Grand Cherokee transmission problem
Oct 10, 2011 (3:52 am)
Hopefully someone out there can help! I have a 4.7lt 2001 Grand Cherokee 150,000 miles on the clock and have had problems with the gearbox when the engine warms up. From cold until say 20 miles running everything is fine and then it drops down into 3rd gear with no response then from the overdrive button. When cold this is not and issue only when it warms up. The jeep dealer cannot find any fault on his diagnostic equipment and has basically washed his hands of it! I have been told to check the grounds which may be losing contact when the engine warms up but they all appear to be fine. Has anyone any experience of this please??
#860 of 1101 97 Jeep Grand Cherokee 5.2 2wd shifting late
Oct 10, 2011 (5:23 am)
I have a 97 Jeep Grand Cherokee with a 5.2 and 2wd that has about 145k on it. Over the last 6-8 months the Jeep has started to shift later and later. It is now at the point that it won't come out of first gear till a little over 3k rpms. Second is the same but shifts a little sooner, maybe 2800 or so. 3rd to drive is fine, drive to overdrive is fine. This started with the transmission bouncing between 1-2 when accelerating hard in city traffic. Highway speeds it runs good, other than the occasional shudder when climbing slight inclines. The shudder is not my main concern at this point. The fact that it's not shifting is KILLING the gas mileage. Just changed Tranny filter and fluid about 8k miles ago. It helped some for a little while, now it is right back to where I was prior to changing filter and fluid. Someone told me it could be the shift packs in the transmission. I am a decent mechanic just don't know much about the new transmissions with all the computer involvment. Any help would be great. Don't really want to take it to a shop and pay $300 for them to look at it and tell me it's going to cost me $1500 to fix something that I can do myself and show my sons how to do in the process. Thanks for any help in advance.
#862 of 1101 Re: Grand Cherokee transmission problem [culbo]
Oct 10, 2011 (7:58 am)
To start with, your Jeep dealer has very little interest (read motive) in getting a Jeep with 150,000 miles fixed. My advice would be to ignore him completely. I had a similar experience with my 1998 Cherokee where both the dealer AND a transmission shop said nothing but a rebuild would fix my Jeep. Neither one could remotely say what the problem was....they were clueless. With nothing to lose, I checked it out myself, found the problem was a bad solenoid valve, fixed it and I am still running it today. That was back in 2009, so in other words don't become discouraged.
I'm assuming you've already checked obvious things such as fluid level, leaks and electrical connections. Sometimes the prongs inside electrical plugs lose their "spring" and don't make good connections like they used to especially in high mileage vehicles. It happened to me with my Throttle Position Sensor. I blamed it on a bad part only to find it was the electrical plug itself.
Since it's temperature related, that implies it could very likely be electrical (switch, sensor, solenoid valve, etc). First thing I would check is the engine temperature sending unit. Your Jeep might have more than one so check that out. Another thing to rule out is the Throttle Position Sensor (TPS) as that would be suspect at such high mileage.
I assume yours has the 45RFE transmission which includes a temperature sensor inside the transmission. That along with the solenoids in my opinion should be checked out after you've ruled out anything external to the transmission.
Above all, don't become discouraged talking to other people about your problem because I haven't found many interested in this type of subject. Good Luck!
#864 of 1101 Re: Grand Cherokee transmission problem [nneal]
Oct 11, 2011 (2:09 am)
Thanks for the replies guys. Some good information and I will act on it and let you know the outcome!
#865 of 1101 Re: Grand Cherokee transmission problem [culbo]
Oct 11, 2011 (8:40 am)
Make sure you have 0 and I mean ZERO transfluid leaks. The cooler lines should be bone dry. My 97 jeep was acting funny and I replaced the cooler lines and it fixed it. My guess is that transfluid leak affects the pressure somehow.
Adjust your band if you have an adjustment.
Drop pan and replace filter. If you let it sit a couple of days without the pan you will get more fluid out of it.
#866 of 1101 96 Jeep Grand Cherokee Transmission Problems
Oct 17, 2011 (11:35 am)
I recently just purchased a 1996 Jeep Grand Cherokee Laredo and it ran great all the way home, but just recently its been giving me some problems. It has trouble downshifting on the highway which makes it almost impossible trying to pass people. Also, when starting from a stoped position it takes a very long time to get up to speed exspecialy when trying to climb a hill. The person i bought it from said he recently put a new tranny in it, so I'm very confused on what is causing this power loss.
#867 of 1101 Re: 96 Jeep Grand Cherokee Transmission Problems [aaron1995]
Oct 17, 2011 (11:48 am)
Can you force the tranny to shift manually?
#868 of 1101 Re: 96 Jeep Grand Cherokee Transmission Problems [boazbez]
Oct 17, 2011 (1:12 pm)
Is this on a 6 cyc engine? Sounds like linkage is not adjusted right. There is a button on the throttle linkage that is adjusted to sync the throttle position with the transmission...pretty easy to do. If you have a 6 cyc and can get the manual it is no problem to do yourself. I just had my trans replaced and did not have a problem but I remember there is that adjustment.
Also might find out where the transmission work was done and take it to them. If they are a reputable shop they should stand by their work and tweak what is not working.