[86cj74.2L]

I did run across this for the shifting between gears. looks like you do not need a scan tool, per-say, except to monitor a parameter or two to know when procedure is complete.

[86cj74.2L]

http://cwbbs.net/manual/HAYNES%20-%20Data%20Book/2007XK/en_US/y2007/xk/si/xml/7c02acc2.xml

This quick learn procedure is what was preformed.

This is the shift learn from above where the link didn't get displayed

http://cwbbs.net/manual/HAYNES%20-%2...l/7c02acc3.xml

[86cj74.2L]

This is a TSB about the Quick learn.

http://www.moveras.com/TechnicalBull...letin_002.html

Looks like after replacing things this must be done..........

[TSyl]

The quick learn procedure should be performed if any of the following procedures are performed:

Transmission Assembly Replacement
Transmission Control Module Replacement
Solenoid Pack Replacement
Clutch Plate and/or Seal Replacement
Valve Body Replacement or Recondition

I dropped the pan, changed the filter, pump, replaced the pan and fluid. Does that qualify for any of the above?

I don't have any of this:

Perform only the portions which target the objectionable shift.

Also, will it learn on its own? Per this:

NOTE: It is important that this procedure be performed when the transmission temperature is between 27-43° C (80-110° F). If this procedure takes too long to complete fully for the allowed transmission oil temperature, the vehicle may be returned to the customer with an explanation that the shift will improve daily during normal vehicle usage. The TCM also learns at higher oil temperatures, but these values (line pressure correction values) are not available for viewing on the scan tool.

Per the TSB I don't think what I did qualifies for:

Any time a major repair is done on this transmission or the transmission is rebuilt or replaced, a relearn procedure must be performed. This procedure is called “Quick Learn”.
Failure to relearn the computers shift settings can lead to geartrain failure and void the warranty on your remanufactured transmission.

It seems like I should be ok. Anyone have some more input?

[86cj74.2L]

you replaced the pump?

[TSyl]

Originally Posted by 86cj74.2L

you replaced the pump?

Actually, no I did not (memory was wrong). I replaced the primary filter and the cooler return filter.

[86cj74.2L]

From the procedures I found googling it seams the PCM can learn on its own with some prompting I.E. doing repeated kick downs from 4th to 2nd with trans temp less then 110degrees (temp is the switch)

But, if you know someone or a trans shop will do it for 20 dollare I say giv it a go.

[gordon]

So, I finally got the Jeep back together, she is running very well, the gearshifts are firm but ok. I will have to look into this line pressure learn proceedure. As this thread has rambled on a bit, here is a recap of what was done;

I got P0740 (TCC failure) twice, along with the tranny getting warm. This was whilts towing at HWY speeds. Since then the P0740 code would show itself if we got up to HWY speeds.

This is waht I changed;

Solenoid pack
Transgo shift kit - including TCC limit pump upgrades
Line pressure sensor
Over and underdrive speed sensors
Torque converter
Added and external tranny cooler.
New fluid and filters.

Code has not (yet) reappearered and the Jeep is running very well.

I firmly believe that the origional failure was due to one or more of 3 things;

Torque converter
Solenoid pack
Insufficient line pressure to hold Tranny in lock up at HWY speeds. Under load (towing), this caused the tranny to get warmer than it should.

Incedentally did you know the average tranny will run at 200f. If you can low that temp to 180f with the addition of coolers, you could double the life of your tranny.

[gordon]

It seems that the upshift from 2nd to 3rd since putting my tranny back together, was firm but is now getting better.

I am deliberately driving my Jeep gently, I am guessing the TCM is doing it's thing and making some adjustments.

From my reading, "Quick learn" Resets back to factory values, over 70 parameters. This will force the TCM to start making adjustments. But I do not think this is absolutely nessesary as my TCM is making some adjustments anyway.

[86cj74.2L]

I agree and feel the TCC failure while towing is what overheated your trans.

What caused it ? solenoid for it may be.

The lock up clutch in the TC could have started slipping and caused the code also. It knows input speed, engine speed, and output speed. It knows that with the TCC energized the engine rpm's should match trans input rpm's.

[sherker55]

What'd that list of parts cost ya? Esp. the trans go kit? I am thinking of adding one, and was wondering what it would cost me to replace some of those things while I am in there...

[gordon]

Originally Posted by sherker55

What'd that list of parts cost ya? Esp. the trans go kit? I am thinking of adding one, and was wondering what it would cost me to replace some of those things while I am in there...

New/reman Torque converter $140
Solenoid pack $170
New Front Tranny Seal/Plate $45
14 qts of ATF4 (Not Dexron) $60
2 Filters & seal $24
Tranny Sump gasket $12 (I think)
Transgo shift kit $57
External Tranny cooler $70
Rear tranny seal $10
Over/Underdrive sensors $10
Line Pressure sensor $20

Total $618.

The transgo shift kit includes pressure regulator pump upgrades for TCC lockup (new balls and springs). It also includes a resistor which is soldered accross pins 1 and 3 of the Line Pressure Transducer, this is to "Trick" the tranny and TCM to increase the line pressure. This way the TCM can still make adjustments and allow for changes in line pressure. This is different from the other mod you can do where you just disconnet one of the wires to double the line pressure.

If you do all of this you have not much else than the clutch packs (steels & Fiber) themselves to replace and you have a tranny as good as new. I wanted to do this but I did not have the time and needed the Jeep back on the road.

I do know that had I taken this to a tranny shop it would have been "You need a new tranny $2,500 please". Beacause it is easier and cheaper for them manhour wise to do that. My Jeep has 110k miles on it, as far as I can work out most trannys are on borrowed time once they have clocked 100k miles, because most folks do not look after them. It will be interesting to see how long it lasts. When it does go, it should be around $200 - $300 for me to change out the clutches myself. One company out there online sell an upgraded 545RFE for towing and guarantees them for 500hp. They also sell the kit to upgrade your own which includes clutches and other upgrades I have done. All I would need to do is obtain the clutches from them.

[mrtosh]

Gordon did you have the quicklearn procedure done or are you letting the PCM/TCM do its own learning thing? I did the solenoid pack and transgo and the shift firmness is sporadic and inconsistent right now. Sometimes smooth shifting and others harsh. I've heard its common until it relearns but I'm not liking the inconsistency right now. I'm guessing my issue is that I haven't given it sufficient time to learn. I've reset he pcm maybe 4-5 times since I've installed the kit and solenoid pack for various reasons(tps, iac, fuel pump). I've talked to a local tranny shop and they concour that it should learn on its own given time(but of course would quick learn it for me for $20 if I so choose).

Originally Posted by gordon

So, I finally got the Jeep back together, she is running very well, the gearshifts are firm but ok. I will have to look into this line pressure learn proceedure. As this thread has rambled on a bit, here is a recap of what was done;

I got P0740 (TCC failure) twice, along with the tranny getting warm. This was whilts towing at HWY speeds. Since then the P0740 code would show itself if we got up to HWY speeds.

This is waht I changed;

Solenoid pack
Transgo shift kit - including TCC limit pump upgrades
Line pressure sensor
Over and underdrive speed sensors
Torque converter
Added and external tranny cooler.
New fluid and filters.

Code has not (yet) reappearered and the Jeep is running very well.

I firmly believe that the origional failure was due to one or more of 3 things;

Torque converter
Solenoid pack
Insufficient line pressure to hold Tranny in lock up at HWY speeds. Under load (towing), this caused the tranny to get warmer than it should.

Incedentally did you know the average tranny will run at 200f. If you can low that temp to 180f with the addition of coolers, you could double the life of your tranny.

[sherker55]

wow, great info Gordon, thanks! I don't know if I have the capability to do this myself, although I do almost all of my own work/repairs...

what company is it that you are referring to regarding the guaranteed 545???

[yrkoverland]

Check out page 27

http://buy1.snapon.com/products/diag...lerTesting.pdf