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727 Overheats! #982435 04/29/11 09:19 AM 04/29/11 09:19 AM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	what could make my 727 overheat bad enough to purge fluid out of the front seal after 30-45min of cruising? i have a deep summit aluminum pan, and the biggest aftermarket trans cooler i can fit, im assuming its overheating it only leaks after driving and its a SERIOUS leak.

Re: 727 Overheats! [Re: coronet1966d] #982436 04/29/11 09:28 AM 04/29/11 09:28 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Hi Randy, not from overheating but from front pump seal needs R&R live every 24 hour block of time like it's your last day on earth

Re: 727 Overheats! [Re: RapidRobert] #982437 04/29/11 09:38 AM 04/29/11 09:38 AM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	the seal is new

Re: 727 Overheats! [Re: coronet1966d] #982438 04/29/11 09:44 AM 04/29/11 09:44 AM
Joined: Jan 2003 Posts: 15,548 Norwich CT USA moparts I Live Here
moparts I Live Here Joined: Jan 2003 Posts: 15,548 Norwich CT USA	Over heating ? Coming out the vent right above the seal? The one time I overheated a trans it was coming out the filler tube also. You sure that the trans was not just over full and fluid was expanding and coming out the vent Tom , 2011 Ram 3500 C&C Diesel 2009 Challenger R/T 1971 Challenger Conv. 511/4 speed 1970 Challenger R/T 503/727

Re: 727 Overheats! [Re: coronet1966d] #982439 04/29/11 10:43 AM 04/29/11 10:43 AM
Joined: Jan 2003 Posts: 74,976 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,976 U.S.S.A.	A slipping trans will cause the fluid to overheat .

Re: 727 Overheats! [Re: moparts] #982440 04/29/11 10:46 AM 04/29/11 10:46 AM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	its not slipping, it not shooting out of the dipstick either. i have a cheetah reverse manual VB and a mancinis 3200 stall converter

Re: 727 Overheats! [Re: coronet1966d] #982441 04/29/11 10:50 AM 04/29/11 10:50 AM
Joined: Jan 2003 Posts: 74,976 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,976 U.S.S.A.	Quote: its not slipping, it not shooting out of the dipstick either. i have a cheetah reverse manual VB and a mancinis 3200 stall converter Then you either have a blockage in the cooler circuit or it's overfilled which will cause the fluid to foam and come out the vent which may APPEAR to be the front seal. Do you have a temp gauge and where is it installed ?

Re: 727 Overheats! [Re: JohnRR] #982442 04/29/11 11:10 AM 04/29/11 11:10 AM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	its not overfilled either, this wasnt a small amount of fluid that came out. i could follow a trail a couple miles of fluid that dumped out. i lost 6 quarts total. the trans cooler is new, radiator is new and the trans lines are stainless steel pre bent and also new

Re: 727 Overheats! [Re: coronet1966d] #982443 04/29/11 11:12 AM 04/29/11 11:12 AM
Joined: Jan 2003 Posts: 74,976 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,976 U.S.S.A.	Quote: its not overfilled either, this wasnt a small amount of fluid that came out. i could follow a trail a couple miles of fluid that dumped out. i lost 6 quarts total. the trans cooler is new, radiator is new and the trans lines are stainless steel pre bent and also new Again , TEMP GAUGE location ??? sounds like a seal that was installed DRY and/or was damaged on install.

Re: 727 Overheats! [Re: JohnRR] #982444 04/29/11 11:57 AM 04/29/11 11:57 AM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	like 99% of people on here i dont have a trans temp gauge

Re: 727 Overheats! [Re: coronet1966d] #982445 04/29/11 11:58 AM 04/29/11 11:58 AM
Joined: Aug 2003 Posts: 848 Avondale AZ Prodart440 super stock
Prodart440 super stock Joined: Aug 2003 Posts: 848 Avondale AZ	Just because the radiator is new does not mean the cooler in it isn't plugged. I would check cooler flow. Aaron 68 Roadrunner 383/AT 69 Dart GT Conv. 383/AT 05 Dodge Ram 4x4 Cummins 06 GoManGo R/T Daytona #757 68 Coronet 440

Re: 727 Overheats! [Re: coronet1966d] #982446 04/29/11 12:07 PM 04/29/11 12:07 PM
Joined: Mar 2005 Posts: 862 Iowa State fan kilroy super stock
kilroy super stock Joined: Mar 2005 Posts: 862 Iowa State fan	These guys are giving you sound advise. It probably has to be one of the above. Step back and start trouble shooting. take lines loose blow air through cooler see if plugged. (note: cover end of line with rag so fluid does not spray everywhere.) Blow air through radiator cooler, blow air through cooler lines, drive again. If its not cured sorry bub, but the seal is shoot or their is an plugged internal passage. Sometimes new stuff goes bad or gets damaged even with the best care. Unless its really simple thing you are just missing there is not a magic bullet. Trouble shoot and get back to us! 1973 Charger, former SE, former auto I'm not trying to be difficult, it comes naturally....

Re: 727 Overheats! [Re: Prodart440] #982447 04/29/11 12:10 PM 04/29/11 12:10 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: Just because the radiator is new does not mean the cooler in it isn't plugged. I would check cooler flow. I Agree, disconnect the rear line at the trans & try putting it in a clear container, have someone start the car & put it in gear while you watch for fluid flow into the container... There should be a steady stream... "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: 727 Overheats! [Re: coronet1966d] #982448 04/29/11 12:36 PM 04/29/11 12:36 PM
Joined: Jan 2003 Posts: 74,976 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,976 U.S.S.A.	Quote: like 99% of people on here i dont have a trans temp gauge Well then what is making you THINK the trans is overheating ?

Re: 727 Overheats! [Re: coronet1966d] #982449 04/29/11 12:47 PM 04/29/11 12:47 PM
Joined: Jan 2003 Posts: 516 ,Pa. 68dodge mopar
68dodge mopar Joined: Jan 2003 Posts: 516 ,Pa.	One thing I would do, is not run the trans fluid into the radiator cooler. I would only use the external transmission cooler.

Re: 727 Overheats! [Re: JohnRR] #982450 04/29/11 12:52 PM 04/29/11 12:52 PM
Joined: Mar 2005 Posts: 862 Iowa State fan kilroy super stock
kilroy super stock Joined: Mar 2005 Posts: 862 Iowa State fan	Quote: Quote: like 99% of people on here i dont have a trans temp gauge Well then what is making you THINK the trans is overheating ? Is the pan scolding hot? Is there burning fluid smell? Is there smoke? If not it probably not overheating enough to do what your talking about. If it is overheating trans is lunch already including possibly the metal heat treated parts such as drums and sprag. 1973 Charger, former SE, former auto I'm not trying to be difficult, it comes naturally....

Re: 727 Overheats! [Re: 68dodge] #982451 04/29/11 12:52 PM 04/29/11 12:52 PM
Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan coronet1966d OP master
coronet1966d OP master Joined: Aug 2003 Posts: 2,682 Clinton Twp. Michigan	Quote: One thing I would do, is not run the trans fluid into the radiator cooler. I would only use the external transmission cooler. when i installed the cooler i considered this, whats the best way to do it? ive heard arguments for both ways

Re: 727 Overheats! [Re: coronet1966d] #982452 04/29/11 02:44 PM 04/29/11 02:44 PM
Joined: Jan 2003 Posts: 2,343 west palm beach, florida modelmakerinc top fuel
modelmakerinc top fuel Joined: Jan 2003 Posts: 2,343 west palm beach, florida	Coronet1966d I will shed some light on this, It has happened to me several times. I asked the question here and got the same responses. I started trouble shooting with fluid levels, too low? no difference! then to a trans temp gauge? no difference! back to fluid level, to High? no difference!. Then slipping converter making too much heat? change gears! NO DIFFERENCE. it still did it. more frustrating? there is nothing worse than puking trans fluid through the bellhousing vent in to windage of the converter to spray out every different direction under the car and start to burn onto the exhaust. I finally spoke with a trans guy and explained to me that with a Cheetah Reverse Valve body somehow it spins the drum over what would be considered normal and foams the fluid until it pukes out. He suggested that I go out and run the car like an old lady for an hour cruise and see if it happens. then on a different day drive the car hard shifting and like you want to drive it and see if it happens. It did it as he said it would. grandma drive, no trouble!. grandson drive, puke and smoke! I am no tranny guy so I dont know the technicals and argue with some "Mopar Experts" about how that is not possible. but I did the experiment and it proved it to me. The solution is to block the vent in the bellhousing and install one in the tailshaft or main housing. the dragrace only forum is the place to ask about the moving of the vent because alot of them experience this trans problem. please keep me posted if you do this test so I know I am not nuts. Henry Exceptional Architectural, Yacht and Automotive scale models. e-mail modelmakerinc@att.net for a portfolio review. www.modelmakerinc.com

Re: 727 Overheats! [Re: modelmakerinc] #982453 04/29/11 03:26 PM 04/29/11 03:26 PM
Joined: Jan 2003 Posts: 74,976 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,976 U.S.S.A.	Quote: Coronet1966d I finally spoke with a trans guy and explained to me that with a Cheetah Reverse Valve body somehow it spins the drum over what would be considered normal and foams the fluid until it pukes out. Henry I'm not going to debate this one but from what I know of the internals of the 727 and how things are connected this is impossible , the drum is connected mechanically to the sun shell which is geared to the rear planet which is splined to the mainshaft and there is no way I can see for it to spin faster with a different valve body configuration. That said, I missed the REVERSE manual VB part and this is a quote from CRT's tech page ... Quote: On 727s & 904s with Trans Brake or reverse pattern valve bodies, CRT recommends that you relocate the vent to the rear of the case. The stock vent is in the pump cover, fluid will leak out of the stock vent when using a trans brake. Drill the stock vent hole with a 11/23 drill bit, then tap the hole using a 1/8 pipe tap. Install 1/8 pipe plug. drill hole at the 11 O clock piston in the rear of case as shown in picture above and install new vent. Also block off the feed hole in the park gear, or you will have fluid spitting out the vent. See pic below

Re: 727 Overheats! [Re: JohnRR] #982454 04/29/11 04:50 PM 04/29/11 04:50 PM
Joined: Jan 2003 Posts: 2,343 west palm beach, florida modelmakerinc top fuel
modelmakerinc top fuel Joined: Jan 2003 Posts: 2,343 west palm beach, florida	Ok, I can't debate what the internals are like I said (I plead ignorance to the reason it happens) I would love to hear why it happens to clear up what I was told. In laymans terms some one explain please. Any way coronet1966d the vent is the resolution. Exceptional Architectural, Yacht and Automotive scale models. e-mail modelmakerinc@att.net for a portfolio review. www.modelmakerinc.com

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