Re: delay when engaging reverse
[Re: extranjero]
#1108818
11/07/11 11:50 PM
11/07/11 11:50 PM
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Joined: Jan 2006
Posts: 587 IL . usa
cjs69mope
mopar
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mopar
Joined: Jan 2006
Posts: 587
IL . usa
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I Have seen this when a shift kit has been installed in the valve body there is a small port that allows the torqe converter to drain back and has to pump up when starting the car in Park . I have seen this hapen to my 68 charger after it sitts for some time But if i start it in netral it seems to help. Some of the trans guys my chime in to explain this more . I belive that this may also be mentioned in the 727 handbook.
1969 Dodge Charger
1969 Dodge Superbee
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Re: delay when engaging reverse
[Re: cjs69mope]
#1108819
11/07/11 11:51 PM
11/07/11 11:51 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:
I Have seen this when a shift kit has been installed in the valve body there is a small port that allows the torqe converter to drain back and has to pump up when starting the car in Park . I have seen this hapen to my 68 charger after it sitts for some time But if i start it in netral it seems to help. Some of the trans guys my chime in to explain this more . I belive that this may also be mentioned in the 727 handbook.
read my above post.
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Re: delay when engaging reverse
[Re: MoparforLife]
#1108823
11/10/11 10:03 AM
11/10/11 10:03 AM
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Joined: Jan 2003
Posts: 1,381 Youngsville, NC
dem440c
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,381
Youngsville, NC
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Quote:
Very common - it is called converter drain back. Cure - start in neutral and let idle for a few seconds to fill the converter before putting in gear. fluid isn't pumped in park.
no, not what I'm referring to.... I've been in the Mopar game a long time and I'm well aware of the whole situation with the fluid not pumping to the converter in Park plus the story behind why they set the valvebody up in such a silly way....
no, I'm talking about a delay to engage reverse always. Hot, cold, lukewarm, whatever, it has nothing to do with the fluid in the converter. Select a forward gear and bump! it drops in immediately. Select reverse and count "one Mississippi..." and bump! it finally drops in.
I ask the question because I've seen it on several different Chrysler transmissions over the years. I've tried a number of things to investigate and address it but haven't figured it out yet. Recently did a full rebuild on a transmission out of a 79 Cordoba that was doing it, I even turned up the line pressure while I was in there but it still did it. Then to experiment I disconnected the kickdown linkage from the carburetor and used a zip tie to hold the lever at the transmission all they way back against its stop and it still had the same delay going into reverse. So it doesn't seem to be a line pressure situation and no, it's not a torque converter fluid level situation.
Maybe I'm the only one that has seen this since nobody else is relating....
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Re: delay when engaging reverse
[Re: JohnRR]
#1108830
11/11/11 01:03 PM
11/11/11 01:03 PM
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Joined: Jan 2003
Posts: 1,381 Youngsville, NC
dem440c
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,381
Youngsville, NC
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Quote:
Do you have a shift kit in the trans ? Do you have any type of delay or overlap on the 2-3 shift? Does it shift hard into reverse?
this particular trans was a stock rebuild using a TransStar kit, no shift kit although I did turn up the line pressure with the adjuster there on the valve body. All forward gears appear to behave normal. Reverse engages with what I would describe as a slightly below normal amount of force, once it engages it seems to be completely engaged and not slipping but has this noticeable delay.
to reiterate- I asked the question after rebuilding a particular transmission which is out of a 79 Cordoba.... but the question has been in my mind for years because I've seen this on several transmissions that have been in my possession. From memory, all the ones I can think of were 900 series transmissions from the 60's through the 80's. Now that I've seen this same behavior from several different transmissions I started to wonder if there is a particular reason (such as a check ball like the one guy was talking about).... you know, something that other people have seen and figured out. I'm a hobbyist not a professional but I do like to do transmission work and I like to have a deeper understanding about the failure mechanisms. Thanks all for your replies.
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Re: delay when engaging reverse
[Re: dem440c]
#1108831
11/11/11 03:45 PM
11/11/11 03:45 PM
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Joined: Jan 2003
Posts: 25,951 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,951
Rio Linda, CA
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You need to pull the pan and have a look/see. If the rear band isn't way out of adjustment an air check of the rear servo is in order.
The INTERNET, the MISinformation superhighway
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