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Old 11-15-2009, 08:10 AM
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700R4 Shifts Too Soon

We put a 700R4 in my sons old school 28 Ford. It has a SBC and what we believe is a 3:73 rear end. We've adjusted the TV cable by opening the throttle all the way and then pulling the cable all the way out and setting the stop. It downshifts a like it's supposed to, but the transmission shifts from 1st to 2nd almost immediately after taking off and you almost can't feel the shifts. I have a 700R4 in my 37 and it shifts much firmer and under normal driving, the 1-2 shift takes place about 12 to 15 MPH, the 2-3 at about 30-35 MPH and into 4th at about 45-50. How do we change the shift points and firm up the shifts?
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Old 11-15-2009, 08:40 AM
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I had the same issue with my 34, you can somewhat play with the shift points by doing some fine adjustments to the TV cable. On mine I could not realize enough by the TV cable alone so I replaced the governor with a Corvette one. That moved the 1-2 shift up to about 2000 rpm, it also moved the WOT 1-2 shift up to about 4800 rpm. Be advised that some firms advertising a Corvette servo are not true Corvette servos.

Vince
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Old 11-15-2009, 06:10 PM
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Maybe it has a diesel governor? Other than that just try it with more TV pressure. But also, if shift timing can't be adjusted with TV cable. Then wrong year valvebody gaskets or many other things in the valvebody can do it. As long as TV cable/throttle angle geometry is good.
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Old 11-18-2009, 10:34 PM
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At full throttle the TV cable from what I remember should be at 3/4 of an inch from full pull. Damn I think I am remembering correctly.

Someone will chime in if I didn't remember that right.
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Old 11-18-2009, 10:50 PM
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Most likely the Governor and Rear gear are miss matched. Z28 or TransAm Gov may work & are also cheap.
You can use a Governor Recalibration kit to raise, lower & fine tune shift points.>>>>>>
http://www.summitracing.com/search/D...?Ns=Rank%7cAsc
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Old 11-19-2009, 07:20 AM
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Quote:
Originally Posted by Hoot Owl
At full throttle the TV cable from what I remember should be at 3/4 of an inch from full pull. Damn I think I am remembering correctly.

Someone will chime in if I didn't remember that right.
Not exactly correct. At WOT the TV cable should be fully extended. The preferred way to adjust the TV cable is with a pressure gage. At idle the TV cable needs to be pulled out about 3/16" or ever so slightly. If you had a pressure gage you would use it to determine the unloaded pressure of the TV cable then pull it out until you see a slight pressure increase and this would be your idle position. The geometry of the attachment to the carb is also critical and is an important aspect of proper adjustment or tuning the shift points.

Vince
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