727 tranny toast?-UPDATE-NOT TOAST! :)
#448872
08/25/09 09:35 AM
08/25/09 09:35 AM
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Joined: Jan 2003
Posts: 203 Washington, PA.
69charger383
OP
enthusiast
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OP
enthusiast
Joined: Jan 2003
Posts: 203
Washington, PA.
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A friend just bought a 68 charger 383/727 combo. The car runs & drives real good. He drove the car home from the seller's house which was 450 miles away without any problems at all. When we started checking the car over, we discovered there is no kickdown linkage for the tranny. Someone pulled the kickdown lever on the tranny all the way forward & put a spring on it to keep it there. My friend said he did not get on it at all on the way home & babied it. Is this tranny toast, or if he puts a kickdown set-up on it (Bouchillon kit)& sets it properly will it be OK? He said when he was checking out the car, he was so excited, he just didn't notice that the linkage was not there.
Last edited by 69charger383; 09/24/09 10:08 AM.
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Re: 727 tranny toast?
[Re: Dodgem]
#448875
08/25/09 10:12 AM
08/25/09 10:12 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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hook the Bouchillon kit and try it 50/50 chance IMO may get lucky,as it seems to be working still,and he took it easy on the trip... good luck
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Re: 727 tranny toast?
[Re: scratchnfotraction]
#448876
08/25/09 11:19 AM
08/25/09 11:19 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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The "kickdown linkage" really only increases line pressure.
If it was babied then there is a good chance it's OK.
Really, though, if you don't know it's history the seals and clutch material is going to be pretty well shot unless it was rebuilt at some point.
I just did a '73 727 with 60k orignal miles. While it looked VERY nice inside there was evidence that the bands and the clutches were starting to flake after 35 + years of use and the seals were hard and brittle as well.
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Re: 727 tranny toast?
[Re: stumpy]
#448879
08/25/09 11:30 AM
08/25/09 11:30 AM
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Joined: Mar 2003
Posts: 3,358 Berwyn, IL
challenger70
master
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master
Joined: Mar 2003
Posts: 3,358
Berwyn, IL
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Quote:
Max pressure is all the way back.
Then why would you put a spring to keep it there? Some of the stuff you find on these cars will make you go nuts
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Re: 727 tranny toast?
[Re: challenger70]
#448880
08/25/09 11:59 AM
08/25/09 11:59 AM
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Joined: Jan 2003
Posts: 75,020 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
Quote:
Max pressure is all the way back.
Then why would you put a spring to keep it there? Some of the stuff you find on these cars will make you go nuts
Because the person that did it is a MORON .
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Re: 727 tranny toast?
[Re: etek]
#448881
08/25/09 12:00 PM
08/25/09 12:00 PM
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Joined: Jan 2003
Posts: 75,020 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
As you know, it just "kicks down" the gears when you boot it (old term!)...let us know what happens!!!
That statement couldn't be more WRONG ...
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Re: 727 tranny toast?
[Re: etek]
#448883
08/25/09 01:11 PM
08/25/09 01:11 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
. As you know, it just "kicks down" the gears when you boot it (old term!)...let us know what happens!!!
WRONG The kick down linkage is a misname for the throttle pressure control linkage which more than anything else controls pressures in the transmission throughout the travel of the throttle and controls shift points with out clutch slippage.
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Re: 727 tranny toast?
[Re: MoparforLife]
#448885
08/25/09 05:29 PM
08/25/09 05:29 PM
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Joined: Jan 2009
Posts: 112 SK, Canada
etek
member
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member
Joined: Jan 2009
Posts: 112
SK, Canada
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Quote:
Quote:
. As you know, it just "kicks down" the gears when you boot it (old term!)...let us know what happens!!!
WRONG The kick down linkage is a misname for the throttle pressure control linkage which more than anything else controls pressures in the transmission throughout the travel of the throttle and controls shift points with out clutch slippage.
SORRY GUYS!!! That's what I was always taught - my apolgies for bringing BAD info to the game!!! But my appreciation for the better info. Funny, becuause I knew it increased line pressure, but thought that's what held it in gear longer...isn't that what it would do in the end??
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Re: 727 tranny toast?
[Re: BeEtLeJuIcE !]
#448889
08/27/09 05:33 AM
08/27/09 05:33 AM
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Joined: Sep 2005
Posts: 401 Berlin, Germany
Flo
mopar
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mopar
Joined: Sep 2005
Posts: 401
Berlin, Germany
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If you drain the fluid... adjust the bands!
Just did the regular maintenance on my original 67 727, which started screwing up the 1-2 shifts. When I got the car someone had disengaged the linkage too, no idea how long it was run like that.
Adjusted the bands and the linkage, changed fluid and filter. Installed the smallest Transgo towing shift improver kit with conservative setting (drilled the holes to the medium size they suggested). Have a perfectly shifting transmission.
1967 Fury III 4door HT
tiny 318, late model roller block, bored and stroked to 344
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Re: 727 tranny toast?
[Re: BeEtLeJuIcE !]
#448893
09/24/09 05:38 PM
09/24/09 05:38 PM
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Joined: Oct 2007
Posts: 1,973 SoCal
jake4cars
top fuel
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top fuel
Joined: Oct 2007
Posts: 1,973
SoCal
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Quote:
Is it toast ? .. as has been suggested above look at the fluid and if it is not brown .. probably NOT.
With what you have now .. "tie" the lever HALF WAY back and then test-drive it with it under part-throttle only.
SEE how it shifts and how the gear-changes engage. If that is OK .. to make you feel better - just change the ATF and filter and you should be good-to-go.
yeah, what he said and don't forget to check the band adjustment, chances are the trans is OK.
Joey
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Re: 727 tranny toast?
[Re: jake4cars]
#448894
09/24/09 08:47 PM
09/24/09 08:47 PM
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Joined: Jun 2006
Posts: 916 MB,CAN
PC-CHARGER
super stock
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super stock
Joined: Jun 2006
Posts: 916
MB,CAN
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Here's a simplification of a shift valve in a transmission and how the governor and line/throttle pressure work to initiate an upshift or downshift.
The throttle linkage moves the throttle valve which in turn varies the line pressure up or down. More throttle equals more pressure. This higher pressure does two things. It delays the upshift as well as the pressure applied to the psiton or servo that applies the clutch or band. The governor pressure varies according to output shaft speed. The faster the output shaft turns, the higher the governor pressure. Actually it is a two stage process in a Torqueflite, but for this discussion the pressure rises as output shaft speed goes up.
Now if you look at the first diagram you can see that the line pressure is greater than governor pressure so the valve stays shifted to the left and shuts off the supply to the clutch or band. As road speed goes up the governor pressure starts to rise and when it reaches a point where it is higher than the line pressure holding the valve, the valve moves to the right and opens the passage to the clutch or band. If the throttle is pressed harder, line pressure goes up so the governor pressure needs to be higher (faster output shaft speed) in order to overcome the line pressure to initiate an upshift.
This is a real simplification of the process as there are different size lands on the shift valves to vary the required pressures, boost valves, accumulators, special sized orfices to slow an apply or release speed, but this simple diagram illustrates the need for the throttle linkage. Without it, the shift speeds and pressures are not correct and will burn up the clutches and bands.
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Re: 727 tranny toast?
[Re: PC-CHARGER]
#448895
09/24/09 09:17 PM
09/24/09 09:17 PM
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Joined: Jan 2003
Posts: 25,823 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,823
Rio Linda, CA
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Governor pressure can never be higher than line pressure.
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