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  #13  
Old 11-30-2011, 01:54 PM
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Re: Yet another Grand Cherokee Tranny Issue

Ground straps are quite important and when missing or broken could give strange behaviour. You can buy any ground strap with the same connector sizes and lenght, wouldnīt bother to buy one from jeep itself.
Its a pitty that the mechanic didnīt tell you the TCM fault codes, it could have helped finding the real problem. Speed sensors normally give a fault code when they have a problem, but not always. .
These tranny problems can be really a pain in the a++ to solve. When you have a slipping clutch inside the tranny, your fluid will get a burning smell to it soon and depending on the amount of slip you get a fault code set.
When in manual 1 or 2 you donīt have slip, the torque converter seems to be ok, but the clutch packs for 1st and 2nd gear as well,there must be something in the solenoid valves circuits which is causing the problem. I will have another look into the hydraulics schematics lateron to see if i can come up with something else.
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  #14  
Old 11-30-2011, 09:08 PM
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Re: Yet another Grand Cherokee Tranny Issue

According the schematics, there is no difference in fluid flow between Drive first gear and manual low, the same solenoids are energized. But as you say that when you put it in manual 2 or Low, no slip occurs, i would have a look at the gear shift cable adjustment, to be sure that the floor shifter lever positions do agree with the transmission gear detent positions.
Here is the procedure to check the adjustment:

ADJUSTMENTS - GEARSHIFT CABLE
Check adjustment by starting the engine in PARK
and NEUTRAL. Adjustment is CORRECT if the
engine starts only in these positions. Adjustment is
INCORRECT if the engine starts in one but not both
positions. If the engine starts in any position other
than PARK or NEUTRAL, or if the engine will not
start at all, the park/neutral position switch or TRS
may be faulty.
(1) Shift transmission into PARK.
(2) Remove floor console as necessary for access to
the shift cable adjustment. (Refer to 23 - BODY/INTERIOR/
FLOOR CONSOLE - REMOVAL)
(3) Loosen the shift cable adjustment screw (Fig.
64).
(4) Raise vehicle.
(5) Unsnap cable eyelet from transmission shift
lever (Fig. 65).
(6) Verify transmission shift lever is in PARK
detent by moving lever fully rearward. Last rearward
detent is PARK position.
(7) Verify positive engagement of transmission
park lock by attempting to rotate propeller shaft.
Shaft will not rotate when park lock is engaged.
(8) Snap cable eyelet onto transmission shift lever.
(9) Lower vehicle
(10) Tighten the shift cable adjustment screw to 7
N·m (65 in.lbs.).
(11) Verify correct operation.
(12) Install any floor console components removed
for access. (Refer to 23 - BODY/INTERIOR/FLOOR

CONSOLE - INSTALLATION)

Some other thing that could be going on, is that the transmission isnīt going into first gear when cold, but directly into 2nd. The acceleration becomes more sloppy and it seems that something is slipping, which is in fact the torque converter, which has to do a lot more work due to the incorrect gear ratio. But then there should be a fault code set.
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  #15  
Old 12-01-2011, 09:41 AM
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Re: Yet another Grand Cherokee Tranny Issue

That's what I thought, I'll have to get a ground strap somewhere. Could be the source of at least some issues. The shifter is adjusted properly as far as I can tell. It only starts in park or neutural and everything is behaving as it should when you manually shift. As for when it is cold, it is definitely slipping. When I back it out of the driveway in the morning and then put it into drive it will just sit there like it is in netural until I start giving it gas (or manually shift to 1st or 2nd). Then it acts like it has no fluid and slips. You can rev the engine like it is in neutural and it will slowly start to roll ahead until it gradually engages the gear and goes. If I have a load in the jeep or happen to have my trailer hooked up it can hardly move, so I normally have to immediatly restart the vehicle to even get it to go. It slips a tiny bit in reverse too, but not nearly as bad as when you put it in gear. Also as it warms up it does get better, but won't entirely go away unless you shut it off and restart. Letting it sit and idle in the driveway makes no difference, although the dealers mechanic said it has to be in neutural, not park to properly warm it up. That may be true, but the only way I could do that is to block the wheels every time I start it so it doesn't roll down the driveway. LOL What I normally do is run it for a couple minutes before I back out of the drive (it's cold this time of year). Then after I drive it a couple blocks in town I shut it off at the stop sign and restart. Seems to cure the slip. However, if I drive it for a hour or more, especially at speeds of 65mph or more, then I start having the other shifting issues I described. Even then, they are hit or miss and hard to replicate for a mechanic. The mechanic did check the fluid when I had it in to scan for problems and he agreed with me that there wasn't any burnt smell. That makes me think it is a fluid flow problem, more than a mechanical clutch type problem although I'm sure it is adding wear to my tranny even though I try not to let it slip any longer then necessary.
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Old 12-01-2011, 02:50 PM
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Exclamation Re: Yet another Grand Cherokee Tranny Issue

I have a 02 GC that has the 545 transmission that was acting very strangely! Some time it would seem to slip other times there was a clunk between 2-3. Other times it would just stall out! I did notice when the clunk happened the engine did not idle down! One time I caught it idling fast after stalling out!

I did not get any codes! But what I did was reason that the TPS must have something to do with this! So I got out my old analog voltage meter (digital meter did not show the error to well due to the sampling rate of the meter). I first check for 5.0volts from the PCM, that was ok! Then I back probed the plug! Turn the key to the on position, engine off! Move the throttle from idle to WOT slowly, watch the analog meter. The needle should rise to 5 volts evenly, with no flat spots! Mine had a large flat spot on it! Bought a new TPS, installed it, checked it for flat spots, none! All the crazy issues with the transmission went away! LOL

I guess you just never know what is tied to what in this dam computerized system!

Mike -
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Old 12-21-2011, 11:27 PM
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Re: Yet another Grand Cherokee Tranny Issue

I have the same problems, the tranny is starting out in 2nd or 3rd gear. Try turning off overdrive when cold and see if the tranny holds low gear when accelerating moderatly and letting off accelerator pedal. If so the solenoids fixed mine. They have a history of going bad anywhere after about 60,000 miles. A GOOD transmission shop should know about this issue as mine knew exactly what I was describing.
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Old 12-22-2011, 12:38 PM
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Re: Yet another Grand Cherokee Tranny Issue

I just had the same issues but luckily a new Governor Pressure Sensor and Governor Pressure Solenoid fixed it. What a pain the a**.
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Old 12-25-2011, 08:54 PM
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Re: Yet another Grand Cherokee Tranny Issue

The issue of slipping in the morning or after a longer time switched off, was addressed in the beginning to a faulty cooler return filter (the round spin-on one). The fluid in the torque converter could flow back to the pan via the filter, causing a delayed torque converter function. ( the torque converter is a fluid coupling and without fluid it canīt transfer the torque). So it needed to fill up the torque converter first, causing the delay. There is also a cooler return filter bypass valve, next to the filter, which could cause this same problem when not working properly.
So i donīt think your problem is related to slow gear application, but more torque converter related. Do you know if they changed the converter together with the tranny?
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Old 12-31-2011, 12:47 AM
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Re: Yet another Grand Cherokee Tranny Issue

May not fix it, but try adding the 2 part additive that you can pick up at wal mart. It's worth a try since you've already put so much into it and are trying to get as much info as possible before you drop more money into it.
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Old 01-04-2012, 09:15 PM
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Re: Yet another Grand Cherokee Tranny Issue

Frank - I don't know if they did the torque converter, but I doubt it. I did ask about the filter leaking back and they said the changed it to the proper type. This might be a dumb question, but where is the tranny cooler return filter located? I've never noticed one under the Jeep anywhere or are you refering to the round one inside the transmission? If the torque converter is draining out that would explain some of the slipping, but wouldn't it do it in reverse as well?

I'm kind of leaning towards the governor pressure solenoid/sensor simply because turning the engine off and restarting almost always fixes it. To me that sounds like a valve sticking or a faulty sensor reading and since I've already had the main solenoid pack replaced and the TPS checks out ok those would be next. Can the govenor pressure sensor/solenoid be changed by a average gearhead or should I let a tranny shop do it? Does anyone know a good tranny place in Iowa? I've had so many problems with the local mechanics already that I don't want any of them touching my baby again. The last one I had work on it cut a section out of my factory front skid plate so he could align the front end! Apparently it was too much work for him to bother with removing it the right way!!! I prefer to work on things myself whenever I can, but sometimes work keeps me busy and when I need my vehicle fixed ASAP I have to go to a local mechanic.

Has anyone ever heard of these guys: http://www.transmissionsone.com/45rf...s_from_pat.htm It's definitely not the cheap way to go, but I like to keep my options open, since I'm always trying to improve on my Jeep when I have to replace a part. LOL
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Old 01-04-2012, 09:46 PM
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Re: Yet another Grand Cherokee Tranny Issue

The cooler return filter is indeed the round spin-on filter inside the tranny.
If the torque converter is not completely filled with fluid, it canīt transfer torque, in fwd gear or reverse gear. But this normally only happens shortly after startup after being off for at least several hours, once its working normal, the fluid should not drain out of the converter anymore. The torque converter is in fact always slipping, until the point that the torque converter clutch is engaged, then its fixed.
Besides the transmission solenoid/TRS assembly (transmission Range Sensor) inside the tranny, there are NO other solenoids to control the transmission.
Inside the transmission solenoid pack, there are 5 clutch control solenoids, 1 multi select solenoid (for limp in mode) and 1 pressure regulating solenoid and further 5 pressure monitoring switches.
There is not such thing as a governor pressure solenoid in the 5-45RFE (it is in the 42RE).
Was the line pressure sensor changed on it? Its on the right aft side of the tranny and its signal is used to regulate the control pressure. If this sensor is measuring wrong, it could mean that the regulated pressure gets too low, which could lead to slip ofclutches. People who installed a transgo kit in their tranny, they normally also installed a special resistor on this sensor, which had as a goal to increase the line pressure and to have firmer shifts and less clutch slip (less wear). I had red in an other forum that if you just disconnect the connector to this sensor, it will make the TCM to regulate to a preset value (which is higher then the normal operating line pressure). I have checked it out on my jeep and you wonīt get a check engine light, but the shifts feeled a bit firmer (not that much tough). You could check it out to see if it will make any difference on your trannys (mis)-behaviour. The sensor is not that expensive ( i bought the 2 speed sensors and the line pressure sensor for 90 USD).
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  #23  
Old 01-04-2012, 11:38 PM
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Re: Yet another Grand Cherokee Tranny Issue

Thanks for clearing that up for me before I started hunting non existant sensors. I have one of those transgo kits to put into my Jeep, but I didn't want to mess with anything until I get the other problems figured out. Do you remember where you bought your sensors? Sounds cheap enough. I should probably just replace both speed sensors (just in case the mechanic didn't do it) and that line pressure sensor and see if it fixes anything. It can't hurt anything to try. I would love to firm up the shifts on my Jeep a bit. I've been meaning to try snipping that green #10 wire on the TCM to see what effect that has. Has anyone here done the snip in conjuction with a Transgo shift kit? Would they mess each other up? Just asking in case I ever get this thing fixed up and can start working on performance mods again.
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Old 01-05-2012, 12:12 AM
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Re: Yet another Grand Cherokee Tranny Issue

Quote:
Originally Posted by 02GrandHO View Post
Thanks for clearing that up for me before I started hunting non existant sensors. I have one of those transgo kits to put into my Jeep, but I didn't want to mess with anything until I get the other problems figured out. Do you remember where you bought your sensors? Sounds cheap enough. I should probably just replace both speed sensors (just in case the mechanic didn't do it) and that line pressure sensor and see if it fixes anything. It can't hurt anything to try. I would love to firm up the shifts on my Jeep a bit. I've been meaning to try snipping that green #10 wire on the TCM to see what effect that has. Has anyone here done the snip in conjuction with a Transgo shift kit? Would they mess each other up? Just asking in case I ever get this thing fixed up and can start working on performance mods again.
Ive been running the Transgo and the "snip" together for a couple of years with no problems.You'll enjoy the combination. As far as your issues now I agree with merwin change the tps. Speed sensors will throw a code. Stop chasing ghosts until you check the easy stuff. A new tps has fixed quite a few trannys on here.
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