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  #1  
Old 07-04-2014, 04:07 PM
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65rfe help

What can I do to improve the shifting on a 65rfe transmission? It doesn't seem like there's anything out here unless it's the same as a 545rfe.
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Old 07-07-2014, 02:17 PM
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Re: 65rfe help

Is everybody as clueless as me or did I post this in the wrong thread?
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Old 07-07-2014, 08:50 PM
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Re: 65rfe help

Not familiar with the 65RFE, but it is a modified 5-45RFE with one more gear. So most probably the things applicable to the 5-45RFe will also be for the 65RFE.
Is there anything specific you want to change on the shifting? You could install a shift kit, which will make the shift times shorter and due to the higher line pressure, the clutches will also have more holding power.
If it is just shifting rough, you could first try a battery disconnect, which will errase some of the TCM memory and will change the shifting a bit. If that doesnīt help, you could try a quick learn, for which a dealer scanner is needed, which will bring the TCM memory back to factory specs, whereafter is will relearn the optimum settings.
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Old 07-07-2014, 09:13 PM
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Thanks for the reply. I just want quicker, firmer shifts. I read about the sonnax line pressure booster and a transgo shift kit, but it was all for the 545. I couldn't find anything on the 65, just that it is what's in the 2012 JGC's. I know they're similar and I read that it was a software change that makes it a 6 speed instead of a five speed. I also read that the valve body isn't exactly the same as the 545, not sure about that though.
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Old 07-07-2014, 09:49 PM
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Re: 65rfe help

Some googling shows that the 5-45RFE and 65RFE are basically the same transmissions. The 5-45RFE had already 6 forward gears, 1st, 2nd, 2nd prime, 3rd, 4th and 5th. 2nd gear was used during upshifting, while second prime was used during downshifting when passing on a highway for example.
On the 65RFE, when in automatic mode, it still behaves the same as the 5-45RFE, but when in electronic range select mode, you can use all 6 six gears when upshifting.
You could maybe use a tuning program to change the shifting and increase the line pressure.
Eventhough the valve bodies are the same for the 5-45RFE and 65RFE, there are some minor differences between them. The 65RFE uses different springs in the accumulators. For this reason a 5-45RFE shiftkit will not work well on the 65RFE.
I did find some interresting reading on the differences between 5-45RFE and 65RFE, but unfortunately its larger then 5Mb and can not be attached.
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  #6  
Old 07-08-2014, 09:16 AM
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Re: 65rfe help

Thanks, I didn't find that info. Could you post a link or a web address to where you found it? Do you think the line pressure booster will work since it's basically the same as the 545? Good info! I wondered what the differences in the valve bodies were.
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Old 07-08-2014, 09:50 AM
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Re: 65rfe help

I saw that in my enthusiasm i put in a gear too much for the 5-45RFE and made it a seven speed tranny, but i solved that. When im at home tonight i will search for the site address and send it to you. In principle the line pressure booster will work on your 65RFE as well. It will modify the pressure feedback signal to the TCM with a simple resistor, causing a higher line pressure. This will give firmer shifts and more holding power for the clutches.
When i send you the site address tonight, you can see that basically the 65RFE is a 5-45RFE, it has some modifications to it. The bellhousing is larger, which i think was done to fit in a larger torque converter. Also several clutches have more discs, increasing the holding power of each clutch.
All this said, increasing the line pressure doesn't give you the advantage of a shiftkit.
The problem with all standard trannies is that they are made for comfort and not for longevidity. The way an automatic transmission works, is that when it shifts gears, that one clutch will be applied, whereafter an other will be released. This (short) time that both clutches are applied, is called the overlap time. Due to the different speeds off the clutch components for the different gear this overlap will cause clutch wear and transmission temperature increase. The shorter the overlap time, the less wear and temperature increase. Shift kits normally have stronger accumulator springs, and in this way shorten the overlap times.
It will reduce a bit the comfort level, since you will feel a bit more the shifting.
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Old 07-08-2014, 10:09 AM
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Re: 65rfe help

I'm familiar with how a trans works. Put a few B&m shift kits in turbo 350's, 400's and rebuilt a 4l60e. I'm just hesitant with the lack of info out there on the 65RFE. I like to be well informed before I start. I used a programmer to increase the pressure in my 4l60e and cracked the housing on the pump. It was aluminum and not cast, but I didn't think you would be able to do that with a programmer. So shift kit is what I'm leaning towards if there is one. Not really worried about how hard it shifts. I don't think it will shift as hard as my street fighter turbo 400 did
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Old 07-08-2014, 11:37 PM
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Re: 65rfe help

Here is the web address i promissed: http://c.ymcdn.com/sites/members.atr...8rfe-intro.pdf
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  #10  
Old 07-09-2014, 01:42 PM
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Re: 65rfe help

Thanks for the address. As long as the 68rfe has the same valve body as the 65rfe, the shift kit will work.
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Old 07-09-2014, 04:36 PM
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Re: 65rfe help

The shift kit will change the behaviour of the shifting, it is only not known if the springs in the shiftkit will be stronger then the ones in the 65RFE valve body. You can give it a try and change back if you donīt like the result.
You are now talking about 68RFE and 65RFE?
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Old 07-09-2014, 05:28 PM
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Re: 65rfe help

The web address you sent me compared the 68rfe and the 545rfe trans. That's why I compared the 65 and 68. Also why I wondered if the valve bodies were the same, because they have a shift kit for the 68rfe.
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