Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Why wont my 700r4 shift right!

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Old Jan 31, 2007 | 01:21 PM
  #1  
ZZ4 86 Z28's Avatar
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From: Rockville, Maryland
Car: 1986 Z28 Camaro Gunmetal Gray with
Engine: GM Crate ZZZ HO 350, Edelbrock head
Transmission: Rebuilt 700r4 all TransGo and Beast
Axle/Gears: 10 bolt with 3.73 gears
Why wont my 700r4 shift right!

This is the millionth time ive had a problem with it. As soon as i got it back from the rebuild, my mechanic installed the tranny (part of the whole deal, couldve done it myself). anyhow, my mechanic screwed up majorly and i wound up switching from tpi to carb after messing with the tpi and getting sick of it. so first thing was that it shifted pretty good normally but 3500 at wot. i changed the tv cable to a new carb tv cable. same problem. shifts a little nicer now at normal driving, but barely ever downshifts and wot shift is at like 3200-3500. maybe the wrong governor is in there? maybe i need to grind down the weights? i cant tell what the hell is wrong. no matter where i put the tv cable wot is always around 3500. all the way and all the way out. what is wrong. i just wanna buy a th350 and get it over with, but i spent so much time and money on this damn 700. help.
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Old Feb 3, 2007 | 05:34 PM
  #2  
ZZ4 86 Z28's Avatar
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From: Rockville, Maryland
Car: 1986 Z28 Camaro Gunmetal Gray with
Engine: GM Crate ZZZ HO 350, Edelbrock head
Transmission: Rebuilt 700r4 all TransGo and Beast
Axle/Gears: 10 bolt with 3.73 gears
no help?
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Old Feb 10, 2007 | 05:32 PM
  #3  
ZZ4 86 Z28's Avatar
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From: Rockville, Maryland
Car: 1986 Z28 Camaro Gunmetal Gray with
Engine: GM Crate ZZZ HO 350, Edelbrock head
Transmission: Rebuilt 700r4 all TransGo and Beast
Axle/Gears: 10 bolt with 3.73 gears
someones gotta know whats up.
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Old Feb 11, 2007 | 01:46 AM
  #4  
pmpnavt's Avatar
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From: Chicago, IL
Car: 1988 Pontiac Trans Am GTA
Engine: L98 350
Transmission: 700r-4
you can drop the pan and see if the TV valve is moving correctly. i have a guage installed to monitor the pressure of the tv valve just in case.

when i had this issue i called the guys at 700r4.com and they had me, while the car was running, pull the TV cable all the way out and then let it go and do that quite a few times. they wanted to see if maybe the valve would fix itself, but it turned out my issue was an internal pump problem

hope that helped
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Old Feb 11, 2007 | 11:51 AM
  #5  
ZZ4 86 Z28's Avatar
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From: Rockville, Maryland
Car: 1986 Z28 Camaro Gunmetal Gray with
Engine: GM Crate ZZZ HO 350, Edelbrock head
Transmission: Rebuilt 700r4 all TransGo and Beast
Axle/Gears: 10 bolt with 3.73 gears
so you want me to pull the tv cable all the way and then all the way out a few times, with the car running? because normal shifts are fine, its just the wot shift.
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Old Feb 11, 2007 | 04:07 PM
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pmpnavt's Avatar
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From: Chicago, IL
Car: 1988 Pontiac Trans Am GTA
Engine: L98 350
Transmission: 700r-4
thats what the trans shop told me to do to "unstick" the tv assembly. in my case it didnt help out cuz of the pump problem. what my car was doing was delayed shifts to 3000ish and at under heavy load the car would just kinda slip into gears.

once i hooked up the pressure gauge to the side of the trans i could monitor the pressure and thats when i found the pump was fading out at higher rpms. the pressure would rise up to about 120ish and then drop down to 60-70ish the more i pulled the cable. the new trans has instant pressure changes with tv movement and caps out above 200psi.

im only 25 years old and owned 2 f-bodys and 1 y-body all with 700's in them. if anything im far from an expert, just sounds like what i went through without the pressure gauge moving the tv cable is kinda like shooting into the dark, you might get it you might not
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Old Feb 11, 2007 | 04:32 PM
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ZZ4 86 Z28's Avatar
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From: Rockville, Maryland
Car: 1986 Z28 Camaro Gunmetal Gray with
Engine: GM Crate ZZZ HO 350, Edelbrock head
Transmission: Rebuilt 700r4 all TransGo and Beast
Axle/Gears: 10 bolt with 3.73 gears
thats not the problem at all. pressure is good, shifts are fine, just when i go full throttle it shifts before it should. i probably have the wrong governor (determines when to shift, and size of weights and springs determine wot shift)
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Old Feb 11, 2007 | 04:50 PM
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From: my garage
Car: 84 firebird T/A
Engine: shinny 350
Transmission: slush box L65
Axle/Gears: Torsen "3.73"
try corvette gov. B&M shift valve that keeps from down shifting too early and a gil younger shift kit.

also use ford fluid

this should be the ticket for you.

jeff
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Old Feb 11, 2007 | 04:58 PM
  #9  
ZZ4 86 Z28's Avatar
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From: Rockville, Maryland
Car: 1986 Z28 Camaro Gunmetal Gray with
Engine: GM Crate ZZZ HO 350, Edelbrock head
Transmission: Rebuilt 700r4 all TransGo and Beast
Axle/Gears: 10 bolt with 3.73 gears
B&M shift valve?

i was just gonna get a stock governor, maybe a recalibration kit, and leave it at that.
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Old Feb 11, 2007 | 06:33 PM
  #10  
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From: Chicago, IL
Car: 1988 Pontiac Trans Am GTA
Engine: L98 350
Transmission: 700r-4
WOT shifts are also controlled by the tv system not just the governor. with no disrespect, you make it sound like if the tv cable was disconnected the governor has full control of the shift timing...

you mentioned "barely ever downshifts and wot shift is at like 3200-3500" it sounds like a tv issue. i dont remember the governor ever controlling downshifts. when i switched to carb set up i also had to get a relocation bracket for the tv cable to mount to for correct movement of the cable.

quoted from 700r4.com
"Short Spring Syndrome also delays the signal to delay the up shift timing, consequently the transmission will "usually" short shift ( commonly called stack shifting) as it sequences up through the gears. Stack shifts are shifts that occur earlier then is appropriate for the specific throttle setting at the time. While this condition can be quite irritating, it normally doesn't hurt anything. Low pressures, on the other hand, are very serious and can easily go unnoticed until it's too late since a little bit of slippage can be very hard to detect. Whether you know about it or not, it will still accelerate friction wear.

Another affect from the condition of SSS is its affect on downshifting. Downshifting will be delayed relative to accelerator pedal position or be non -existent altogether. This is especially noticeable while trying to get a forced or detent downshift which relies on the TV plunger being totally depressed into the TV bushing at W.O.T. If your transmission is late to downshift or doesn't two gear (detent) downshift, I would be very suspicious of an SSS condition.

This condition is very easy to identify using a 0-300 PSI gauge to confirm instant pressure response with even the slightest movement of the TV cable. (Insert link) The installer can easily remedy this condition.

sounds like what you have happening
----------
just to add this, even if everyone doesnt like my opinion.

this is a great article for 700r4 info

http://www.tvmadeez.com/article/part3.php

Last edited by pmpnavt; Feb 11, 2007 at 06:38 PM. Reason: Automerged Doublepost
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Old Feb 11, 2007 | 07:09 PM
  #11  
ZZ4 86 Z28's Avatar
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From: Rockville, Maryland
Car: 1986 Z28 Camaro Gunmetal Gray with
Engine: GM Crate ZZZ HO 350, Edelbrock head
Transmission: Rebuilt 700r4 all TransGo and Beast
Axle/Gears: 10 bolt with 3.73 gears
not all my shifts are early. just wide open throttle. all other shifts are great, nice and firm at the right time (has mild shift kit). even when i give it half throttle it waits till like 3000, feels right where it should be. i talked to my tranny builder, a good friend who is a car builder, and dana from probuilt. all said the same thing. im tryin to say normal shifts are fine, wot shifts are the only problem. and guess what controls wot shifts....the governor. so when its just based on tv everything is fine, but when the governor gets involved too, it shifts early. o, and it does downshift now that i readjusted again about a week ago.

and that article does not state how to fix this problem if it happened to be my problem.

not calling you wrong, just stating the condition and why i dont believe it is the one you mentioned.
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Old Feb 11, 2007 | 11:51 PM
  #12  
pmpnavt's Avatar
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From: Chicago, IL
Car: 1988 Pontiac Trans Am GTA
Engine: L98 350
Transmission: 700r-4
well at least the downshift issue is fixed

gl with the govenor
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Old Feb 26, 2007 | 04:44 PM
  #13  
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From: So. Illinois
Car: '93 S10 Short bed standard cab
Engine: 383 Stroker
Transmission: 92' stage 2 700r4 w/3600 stall
Axle/Gears: 3.42
Your issues definately sounds like the governor. I would go with one set lighter inner weights on your govenor and see where that gets you. It will probably be trial and error until you get it just right. Just do either one step lighter weights or one step lighter springs. Never do both at once and only go one step at a time. Don't be worried if it's not exactly where you want it the first time. It may take several attempts to get it where you want it.
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