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Old 10-09-2008, 10:06 AM   #1
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Join Date: Oct 2005
Location: Henderson,Texas
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Car: 87 iroc z28
Engine: 5.7 TPI
Transmission: 700R4

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700R4 Overdrive issues
My 87 Iroc-Z keeps shifting back and forth from drive to overdrive while driving at low speed, about 20-40 mph. It dosen't do it at faster speeds. If I shift it manually through the gears it doesn't do it. Does anyone have an idea of what might be causing this.
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Old 10-09-2008, 10:35 AM   #2
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Car: 83 Pontiac Trans Am Recaro
Engine: Crossfire 350
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Re: 700R4 Overdrive issues
I've got the same problem with my 83... in fact every gm I've had with the 700R4 has done that...
let me know what you find out...
its more pronounced in my 83 with the shift kit then the others were...
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Old 10-09-2008, 11:18 AM   #3
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Car: 1986 Chevrolet Camaro IROC-Z28
Engine: TPI 310ci (LB9)
Transmission: Custom Rebuilt 700R4 - 2600 Stall
Axle/Gears: 10 bolt, 3.73 Eaton Limited-Slip

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Re: 700R4 Overdrive issues
My first guess would be that your TV cable needs adjustment / replacement.

http://wiki.answers.com/Q/What_is_th...evy_Camaro_Z28

Probably explains why it works when you manually shift it... I got that problem with my cavalier... It's annoying as hell i feel ur pain lol..

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Old 10-09-2008, 12:41 PM   #4
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Car: 87 iroc z28
Engine: 5.7 TPI
Transmission: 700R4

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Re: 700R4 Overdrive issues
What does it look like? How do you go about adjusting it, and how much?
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Old 10-09-2008, 12:57 PM   #5
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Location: Tallahassee, Florida
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Car: '86 Trans Am and '03 S-10
Engine: 355ci and 4.3l
Transmission: 700R4 and NV3500
Axle/Gears: 7.625/3.42 Auburn and 8.5/3.08 Gov-

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Re: 700R4 Overdrive issues
Really only one way to reset the TV cable. Not intended to be 'adjustable'. But it does sound like a low line pressure rise, so readjust it as instructed and try it out.
But that issue is an inherent problem and a shift correction kit from Superior or ProBuilt should fix the issue permanently
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Old 10-09-2008, 12:57 PM
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