Re: A727 Transgo TF-2 install
[Re: mopar67440]
#1700289
11/18/14 04:59 PM
11/18/14 04:59 PM
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Joined: Jan 2003
Posts: 25,817 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
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The confusion arises from the fact that Transgo changes their instructions like I change my shorts (once a year or so).
The older instructions gave a PR spring setting of so many inches, then so many turns and finally flush.
Ditto the throttle valve, it was originally a 1/8" air gap and then no mention.
The cup orifice is a crap shoot, I would install it and remove it only is you experience RPM flareup on the 2-3 shift.
The INTERNET, the MISinformation superhighway
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Re: A727 Transgo TF-2 install
[Re: mopar67440]
#1700290
11/18/14 09:45 PM
11/18/14 09:45 PM
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Joined: Jan 2003
Posts: 12,093 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,093
Benton, IL.
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I personally experiment with the size of the orifice plug. The 2-3 overlap is one of my pet peeves. You can use tiny core plugs to drill progressively smaller openings till you get a flair up, then back up a little. Others may have a better way to get to the sweet spot, but that is what has worked for me. Usually .075-.100 gets the overlap out. Of course, that means repeated valve body pulls. It is not "one size fits all", so the only way to get it right on any given tranny is to experiment.
Master, again and still
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Re: A727 Transgo TF-2 install
[Re: mopar67440]
#1700292
11/19/14 05:37 PM
11/19/14 05:37 PM
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Joined: Jan 2003
Posts: 12,093 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,093
Benton, IL.
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I have never kept track of the combination of factors that results in any given orifice size curing the overlap. I just keep putting in smaller sizes until it just starts to flair, then I usually go back .005"-.010" larger.
It helps to have access to the numbered drill bits because the fractional ones are usually too large of a step between. Although a 3/32" (.094) might be a good place to start.
The .075"-.100" orifice was just a suggested starting range so as to help minimize the number of times you might have to pull the pan.
Dorman 3/8" cup expansion plugs part #555-115 is what I use.
Trial and error is the only way I know to get it right on any particular combo.
Master, again and still
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Re: A727 Transgo TF-2 install
[Re: mopar67440]
#1700293
11/19/14 05:47 PM
11/19/14 05:47 PM
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Joined: Jan 2003
Posts: 25,817 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
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It's hard to predict with any certainty the shift quality of a trans even when the components/clearances are known, that's the purpose of the restrictor orifice....it can be changed without the necessity of removing/disassembling the trans to change the internal setup.
The restrictor supplied with the TF-2 has a .140" orifice and the orifice in the later factory separator plates is .125"
Tapping the case for a 1/8" NPT socket-head plug makes changes easier....drill the plug to the desired size.
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Re: A727 Transgo TF-2 install
[Re: mopar67440]
#1700296
11/24/14 05:44 PM
11/24/14 05:44 PM
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Joined: Jan 2003
Posts: 25,817 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
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Quote:
Where is the later year .125 orifice located in the separator plate? I'm wondering if this is one of the holes that Transgo instructs to open up, then you install a .140 orific in the housing. This doesn't make any sense. Even if not modified, why install a plug with a larger hole than the plate.
Yes, Transgo instructs you to enlarge this hole...the thought being it's easier to manipulate the orifice in the case.
In the pic below D is the front clutch feed (3rd gear) and B is the kickdown servo feed (second gear).
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Re: A727 Transgo TF-2 install
[Re: mopar67440]
#1700300
11/26/14 06:28 PM
11/26/14 06:28 PM
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Joined: Jan 2003
Posts: 25,817 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
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PR setting depends on the spring, a stiffer spring allows the adjuster to be flush. Go with the instructions for your kit.
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