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Old 09-25-2014, 05:18 AM
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Unhappy Issues with Transgo Kit/45RFE?

Hey guys,

In relation to my P to D engaging delay in the morning, I decided to refurbish the valve body of my 45RFE with a Transgo kit.
Got the 45RFE-HD2 for that purpose along with new filters and Valvoline ATF+4 oil.

Parked the Jeep in the garage at night and the next day at noon started the works (completely cooled). Removed one side of the pan bolts and let the oil slip to the outside until it reached few drops at a time. Removed the rest of the bolts, the filters, and the 6 bolts of the valvebody, the solenoid pack plug... valvebody/solenoids are out.

Followed the exact steps taken by this guy with the 45RFE on youtube:




Found one valve which was worn out between the rings, replaced it with a used one in excellent condition. The valve which was replaced is for the housing in the extreme right:



The inner chamber had no scratches or marks, so it was near perfect. Put everything back in place, along with the resistor as specified in the manual. Filters, Pan, Oil, Plug, etc... Turned the Jeep on, engaged D, PERFECT!! No more delay. Turned it off, rechecked the oil/leaks... On again, rechecked oil, everything is great.

Went for a drive, at first the shifts were firm then a problem appeared. There is a small kick between the next two gear shifts. I cannot pinpoint if it is 2-3 or 3-4. Can someone help please?

On a flat road, whenever you put D from P and push the pedal gently, the first gear shifts is smooth, but the next one is a bit abrupt as if for a 0.2 second the gear is holding before shifting to the next one... PLEASE HELP!!

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  #2  
Old 09-25-2014, 07:37 AM
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Re: Issues with Transgo Kit/45RFE?

The delayed shifting into gear was most probably due to a leaking checkvalve inside the round spinon filter.
With the new (and heavier) accumulator springs, the shift overlap times are shorted, causing a firmer and quicker shift. But the TCM has to finetune the shifts again. Sometimes by disconnecting the battery it will help relearn the shifts quicker. You can just drive around and wait for the relearn to be done. After i rebuild my transmission and also put the transgo kit in, i also had an unpleasant 2-3 shift. I took it to a trans shop where they had the DRB III scanner, where they performed the quick learn. After that smooth shifts.
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Old 09-25-2014, 04:12 PM
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Re: Issues with Transgo Kit/45RFE?

Hello Frango, thank you for your reply.

I was getting all kinds of Faults using a Chrysler scanner. P0740, P0944, P0218, P0864, P0867.... replaced one sensor and reprogrammed the tranny, ended up with only two: P0864 and P0867 (Line Pressure Low/Fault), which was the main reason for the tranny not engaging immediately in D when cold.

Well, thought of two causes, the valvebody and pump. Decided to tackle the valvebody with the transgo, and the problem was gone, except for the 2-3 or 3-4 kick... Funny thing, 3 local Jeep experts told me I have to replace the tranny
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Old 09-25-2014, 04:43 PM
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Re: Issues with Transgo Kit/45RFE?

The picture you had attached in the first thread, is that the actual picture of your valve body?
The P0944 code means loss of prime. This code many times pops up due to a split inlet filter or loose inlet filter. Was any of this the case?
P0740 means that the torque converter clutch was not holding, or due to low line pressure, or due to a bad torque converter solenoid or worn clutch.
P0218 is high temp operation, which normally comes when a clutch is slipping.
The P0867 is a line pressure fault. Could be the pump, the line pressure solenoid valve or line pressure sensor.
The P0864 seems to be a fault in the TCM itself.
Did you only put the transgo kit in, or did you also change the TRS/solenoid block and/ or the pump?
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Old 09-25-2014, 05:06 PM
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Re: Issues with Transgo Kit/45RFE?

P0944: Never checked the filters when I replaced them.
P0740: Not the case. It went away with the tranny reprogramming before installing the transgo (as well as 218 and 944).
P0218: Weird, never experienced any slipping in the tranny. Just a delay in engaging in R and D when cold.
P0864 and 867: Low line pressure which never went away with the tranny reprogramming (before transgo), and led me to take the dive.

All in all, besides the filters and oil, I think the main problem came from the valvebody rings and valve which were replaced by those of transgo. I am pretty sure, 864 and 867 are now gone and in consequence 944, 740 and 218.
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Old 09-25-2014, 05:25 PM
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Re: Issues with Transgo Kit/45RFE?

Ok, i thought that the P0864 and P0867 where still there.
Did you see any wear to the accumulator rings? Could it be that the accumulator piston that you changed, was leaking fluid (from out of your picture, the circled accumulator is the Over Drive accumulator, which is used for 3rd gear and higher)? If it was, then more fluid was needed to actuate the respective clutch (the so called CVI= clutch volume index.) The TCM keeps the CVI figures for each gear in its memory. If you now have solved the leaking accumulator piston, less fluid (lower CVI)is needed to actuate the OD clutch, but the TCM is still using the previous CVI. This will result in a too quick application of the OD clutch and a harsh shift.
You will need to have the quick learn done (the CVI´s will be set back to factory standards), or have to wait for a while, while the TCM will slowly relearn the right CVI.
Was the attached picture from your valve body?
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Old 09-26-2014, 04:57 AM
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Re: Issues with Transgo Kit/45RFE?

Quote:
Originally Posted by Frango100 View Post
Ok, i thought that the P0864 and P0867 where still there. Don't think so. Those codes are related to oil pressure inside the tranny, and I could feel it when shifting from P/N to D, now its gone.

Did you see any wear to the accumulator rings? The rings were normal actually, the wear I saw was on the piston housing. The transgo kit comes with similar rings in addition to metal ones. The metal rings go below the others, which will help seal better the rings to the housing and create better pressure. Could it be that the accumulator piston that you changed, was leaking fluid (from out of your picture, the circled accumulator is the Over Drive accumulator, which is used for 3rd gear and higher)? Yes I suspect that. If it was, then more fluid was needed to actuate the respective clutch (the so called CVI= clutch volume index.) The TCM keeps the CVI figures for each gear in its memory. If you now have solved the leaking accumulator piston, less fluid (lower CVI)is needed to actuate the OD clutch, but the TCM is still using the previous CVI. This will result in a too quick application of the OD clutch and a harsh shift. Most logical answer I got so far, very highly probable, now I can feel the tranny coping with the change. The kick diminished by 90% so far.
You will need to have the quick learn done (the CVI´s will be set back to factory standards), or have to wait for a while, while the TCM will slowly relearn the right CVI.
Was the attached picture from your valve body?
Exactly similar to mine. Got it off google images.
Answers in RED above.
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