need some 727 help
#1272012
07/22/12 04:42 PM
07/22/12 04:42 PM
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Joined: Nov 2010
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BTTG
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mopar
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Just fired my fresh 440 in my 69 Coronet R/T. while I had the eng/trans out I make some upgrades to the 727 (by VIN trans is from a later 1969 383-2 car). Upgrades included a transgo TF2 shift kit as well as replacing the 2.9 lever with a 4.2 (a previous owner had added a part throttle kickdown). Never done any trans work, but I did everything exactly as detailed in the transgo instructions (used Munroe 727 book as well to help with the valve body). Everything appeared to go back perfectly. This includes as well band adjustments as well as the throttle position valve adjustments done exactly as described. Just over 8 quarts of TCI trickshift (Merc) brought the fluid level right up to full on the dipstick. Assume the torque converter is just a run of the mill stock unit (had a drain plug on it).
Got the engine running, but am having trans issues now. I will list some of my observations below. When in D doesn’t seem to want to come out of 1st gear unless I totally let off the gas pedal. Have held it part throttle up to over 4000 rpm and it stayed in 1st.... way way past where it should shift. throttle may be about 1/8 to 1/4 of the way to WOT.
Interestingly if I am going along part throttle in D at say 3000 rpm (stays in 1st), above where it needs to shift relative to speed/throttle, if I downshift to 2nd it instantly upshifts from 1st to 2nd. If I go WOT at 40-45 mph it stays in 3rd (3.55 gears and 27/60/15 rears)… doesn’t downshift.
If I roll out with gear selector in 1st and accelerate hard, but not WOT, when I bump it to 2nd the shift was slow and occurred about 500 rpm after the shift.
At a standstill it drops into gear normally and quick for 1, 2, D, and R
What I have done to try to fix things: Confirmed throttle position adjustment was correctly adjusted Checked gear selector adjustment Made top rod on the throttle position linkage (stock 3 segment linkage) a total of 3 and 6 full turns shorter (from my reading this should bring the shift in earlier) neither appeared to help at all.... from drive only way it comes out of first is completely letting off throttle. With these 2 adjustments the slotted rod went from just in contact with carb stud to 1/8 and ¼ inch of slack. Confirmed throttle opens fully (i.e., throttle lever isn’t fully back before throttle is).
Sorry for long post, but figured all these details may be needed to get to the bottom of this.
Not sure what to do at this point. Any suggestion? New to this so need some help here.
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Re: need some 727 help
[Re: BTTG]
#1272013
07/22/12 06:28 PM
07/22/12 06:28 PM
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Joined: Jan 2003
Posts: 26,862 Rio Linda, CA
John_Kunkel
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Rio Linda, CA
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Did the trans work correctly prior to the recent TF-2 installation and was it using the exact same TP linkage? Does the TP linkage have a spring pulling it forward against the throttle lever stud?
Try temporarily disconnecting the TP linkage at the trans lever and pull the lever full forward, if it upshifts earlier than normal with the linkage disconnected the linkage is the problem.
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Re: need some 727 help
[Re: John_Kunkel]
#1272016
07/23/12 08:01 AM
07/23/12 08:01 AM
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Joined: Nov 2010
Posts: 582 PA
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Thanks for the responses.
Some answers to questions: John TP linkage is the original 3 segment linkage illustrated/described in the FSM (picture attached). Moves fore/aft easily and doesn't bind. Return spring is in place and returns the linkage to full forward position after moving rearward. Literally only drove the car a few times before I pulled things apart as I unexpectedly stumbled upon an engine issue. Only thing I noticed in those drives was it wouldn't drop down to 1st even at slower speeds when it had already upshifted out of first (no 2-1 downshift), but did start in first off the line... didn't 3-2 downshift at higher speeds (learned it does have the part throttle hardware in place when I disassembled the VB)... at WOT it shifted earlier than I had hoped ~4200RPM. Other than that it operated/drove/shifted perfectly fine. As I am new to this in my reading (after pulling the eng/trans) I figured the lack of downshift was related to TP adjustment and the low shift points at WOT was likely related to its calibration for original car (c-body). Figured the former would be fixed by adjusting linkage upon reassembly...
Mike The TP setup was adjusted precisely as described in the FSM. When it wouldn't upshift I then shortened the top segment another 1/8 (3 turns) and then 1/4 inch (6 turns) as from my reading this should cause EARLIER shifts. Thing I wasn't sure of was if these types of changes are significant or not (didn't want to damage anything). I read the Munroe 727 book as well as the FSM for troubleshooting. Seemed like I was at the point that dropping the pan or doing pressure checks was next... As I am new to this figured I'd ask before pushing into the unknown. trans has not been hung on end...
Stumpy I have checked fluid level repeatedly while warm in N on level ground and the level is at full. Believe I have about 8.25 quarts in it right now. From my reading the amount of ATF must vary quite a bit based on the torque converter. I was nervous this was the problem, but as I said the level is up to the full mark and the dipstick appears to be the correct one. I recall from having it apart that the bottom of the dipstick sat just below the mating surface of the pan (maybe an inch or so?). Fluid/filter are fresh.
Next step I will disconnect the linkage at the TP lever, make sure the lever is pulled full forward, and see if this gets it to upshift under throttle. Will quadruple check fluid level. I will do this before investigation anything related to the governor as that will be tougher/uncharted territory for me.
If anyone else has any suggestions let me know. Won't be able to get to this until tonight at earliest or possibly tomorrow. Having a 3 and 1 year old as well as a full time job make it tough to find 15-20 free minutes of time.
Thanks for all help so far.
Last edited by BTTG; 07/23/12 02:42 PM.
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Re: need some 727 help
[Re: John_Kunkel]
#1272019
07/24/12 07:53 AM
07/24/12 07:53 AM
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Joined: Nov 2010
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Partial update. Aplogies for all the detail, but figured it may be useful.
I removed the throttle position linkage at the trans lever and then pulled the throttle lever full forward (towards front of car) and wired it in place. Checked fluid level again hot in N. Took the car for a spin and this is what I observed.
1) From a standstill the 1-2 upshift occurred at 3500+ rpm when in D. With the linkage disconnected I would of guessed the shift would occur very early.
2) Again as I mentioned in my first post if I dropped from D to 2 at lower RPM (trans still running in 1st), when I thought it should have already 1-2 upshifted I could get it to 1-2 upshift immediately.
3) As I was running out of time/daylight/fuel/road I did a couple accelerations from a stop in D and after it 1-2 upshifted at 3500+ rpm I dropped the gear selector into 2. When I did this at first I thought it was downshifting making me wonder if it was in 3rd already (possibly in 2nd from stop?), but I don't think this was the case as the tach barely moved (car is probably cruising at about 35 mph at this point). The hood is off the car and I could see the engine flex (like when it shifts, but more subtle) when this happened. So now I am wondering if this was not a 3-2 downshift, but rather something else being released (as the tach barely moved), but the trans felt like it was being freed up or something?
Sorry for the poor description, but it doesn't help when you are new to this. In reading my thought was maybe somehow it has something (band) applied that should not be at that time and dropping from D to 2nd on the selector helped remove this?
In any event as I said I ran out of time, but figured this may provide insight? Not ignoring other posts, but figured disconnecting the throttle position lever was the first thing to do and figured the other info may be useful.
So in review even with the throttle position lever disconnected 1-2 upshift was occurring at over 3500 rpm and there is something happening after the 1-2 upshift as if I drop the gear selector into 2 it feels as if something is happening (feels like a milder gearshift, but doesn't show up on the tach).
At this point I figured I need to check in for advice as I don't know how to proceed and don't want to toast the tranny.
Thanks for all the help. Really appreciate it.
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Re: need some 727 help
[Re: 451Mopar]
#1272020
07/24/12 12:07 PM
07/24/12 12:07 PM
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451MOPAR and PC-Charger, Thanks. Both of your suggestions related to the throttle valve assembly and its' adjustment on the valve body are on my list of things to check if I hear back that I need to drop the pan/valve body. Holding out to hear though based on my new information I provided in my post right above this one from my test drive last night. After reviewing the Transgo instructions and looking in the Munroe book I am not certain that the sleeve on the throttle valve assembly was put back on with the large opening towards the inside of the VB (since it was stated to assemble that way in the transgo instructions I should of done it, but just can't recall with absolute certainty doing it that way... reassembled the valve body about 18 months ago). I know that I did not make the throttle pressure adjustment on the VB (setting the position of the throttle lever cam relative to the kickdown valve when fully compressed by way of the throttle lever stop screw) as this was not outlined in the transgo instructions. As stated though late shifting was not present before the TF2 kit went in.
So will sit back now and wait to hear any suggestions.
Also in case you didn't see/read my above post in addition to upshift issue that was helped partly by disconnecting throttle linkage it felt as if there was something extra engaged when trans was driving in 2nd gear with selector in D vs driving in second with selector in 2?????
Thanks
Last edited by BTTG; 07/24/12 12:15 PM.
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Re: need some 727 help
[Re: BTTG]
#1272022
07/25/12 09:48 AM
07/25/12 09:48 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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I think you need to pull the valve body. Check the assembly and clearance of the throttle valve, and I think the TF-2 kit uses a different shift valve. When installing the shift valve you may need to tweek the arm that moves the shift valve so it aligns with the passages in the valve body. The instructions should show this. I also think you need to file a groove in the valve body at the shift valve location. You may also want to remove front clutch restrictor in the case. double check the pressure valve adjustment too. Since your in the trans, re-adjust the bands. The Sonnax oversize front servo kit helps improve the 2-3 shift by reducing leakage (the front fluid circuit that applys the front clutch also applies pressure/fluid to the front servo between the servo piston and cover to release the front band) to the with the "O"-ring sealed cover, and releasing the front band quicker on the 2-3 shift. Transmissioncenter has these servo kits for $73, part number #518RED16: http://www.transmissioncenter.net/727transmission.htm The description says to use with above cover, but the kit shows the sealed cover included.
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Re: need some 727 help
[Re: bboogieart]
#1272025
07/30/12 09:39 AM
07/30/12 09:39 AM
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So I dropped the pan and VB. The throttle valve assembly WAS assembled correctly. I did make a minor adjustment to the stopscrew that stops the cam on the throttle lever shaft (made it shorter). Pulled the rest of the VB apart and confirmed everything was assembled correctly and moved freely (Used the Munroe 727 book to confirm assembly). Bands are adjusted correctly.
Only thing I did see that made me think was related to the manual valve. With the TF2 the manual valve is replaced w/ a transgo one that has a thicker and a thinner middle land than the original. position is suppose to be set so the thin land just enters the 4th webbing of the valve body when in Park. On mine the land just about fully enters the web meaning the manual valve is set deep. as the valve is moved off the indexes on the rooster comb the valve would/should be a hair deep at each position. however, as the the thin land is quite narrow 0.04" I don't know how close is close enough. what would the result of this be? Could it contribute to any of my symptoms? see attached picture for the instructions sheet.
my though is I need to bend the arm to move the manual valve outward a bit, but from a diagnosing standpoint want to know if this is enough to explain my problems since nothing else was really found???
any other suggestions while the VB is out?
thanks
Last edited by BTTG; 07/30/12 09:46 AM.
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