How to adjust 700R4 bands
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How to adjust 700R4 bands
Hi guys, I have a low mileage rebuilt 700$R4 that I just got, and it is flaring the 1-2 shift really bad only at fairly heavy throttle. TV works fine.
How do I adjust the bands in this trans? I have only rebuilt Chrysler 727/904 autos and the intermediate band adjusts externally on those transmissions. Obviously the 700R4 is not so easy to adjust.
Specs and instructions would be super!
Thanks
How do I adjust the bands in this trans? I have only rebuilt Chrysler 727/904 autos and the intermediate band adjusts externally on those transmissions. Obviously the 700R4 is not so easy to adjust.
Specs and instructions would be super!
Thanks
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Re: How to adjust 700R4 bands
can't adjust the bands on 700's. you need to replace the 1-2 servo with the 094 (corvette) type and put in a larger boost valve. both peices shouldn't be over $40. (local shop here sells the servo's for $14.95 and the .500 boost valve for around $20 i think)
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Re: How to adjust 700R4 bands
I have those parts but have not installed them yet. This is not "normal" operation of this transmission, I want to get it working right before I start throwing speed parts at it. The engine rpm's run away to overrevving when it does the 1-2 shift. Like I gain 2000 rpms during the duration of the shift. That is not normal.
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
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Re: How to adjust 700R4 bands
I have those parts but have not installed them yet. This is not "normal" operation of this transmission, I want to get it working right before I start throwing speed parts at it. The engine rpm's run away to overrevving when it does the 1-2 shift. Like I gain 2000 rpms during the duration of the shift. That is not normal.
-- Joe
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: How to adjust 700R4 bands
Too much tension and it burns the band out
Too little and it burns the band out.
I scratched my head too, but seemed to have got it right.
-- Joe
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Car: 1977 camaro z28
Engine: 350
Transmission: 700r4
Axle/Gears: 3.42
Re: How to adjust 700R4 bands
I want to say that you install your servo without the outter o-ring and push the assembly in by hand and see if you have about an 1/8 play.
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Car: 89 Firebird
Engine: 406 CI
Transmission: Pete K 700R4
Axle/Gears: 3:55
Re: How to adjust 700R4 bands
On a 700r4/4l60/4l60e trans, the servo is not adjusted. Gm (and rebuilders) use a 1,2,3 or wide band pin (selective length) to set it for the life of the trans. The gm tool will allow approx .100-.160 sevo pin travel, and still be considered ok. I normally aim for .085 of cover travel. I try to stay within.010 of that number. Others may agree, or disagree.
#9
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: How to adjust 700R4 bands
On a 700r4/4l60/4l60e trans, the servo is not adjusted. Gm (and rebuilders) use a 1,2,3 or wide band pin (selective length) to set it for the life of the trans. The gm tool will allow approx .100-.160 sevo pin travel, and still be considered ok. I normally aim for .085 of cover travel. I try to stay within.010 of that number. Others may agree, or disagree.
-- Joe
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Car: 89 Firebird
Engine: 406 CI
Transmission: Pete K 700R4
Axle/Gears: 3:55
Re: How to adjust 700R4 bands
Transgo eliminates the spring and uses spacers to set the pin. Gm matches the selective pin to the case/band/drum combo.They have a go/no go guage to measure it. On most of the overhauls I do, I wind up using the longest pin they have, and if needed, grinding it down slightly to give the travel I wish it to have.
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