700-r4 double gear downshift - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-10-2006, 05:25 AM
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700-r4 double gear downshift

I've tried searching through the archives with no luck. I have a 700-r4 that has maybe around 11K miles on it. It was from a 1992 Camaro Z28. I bought it used from a guy who worked at a Chevy dealer and had one of the techs rebuild it (he totalled his car). Before I installed it into my car I added a transgo shift kit, .500 boost valve, vette servo (may have already had one in it), and a B&M kickdown valve. The transmission works fine and shifts quick and firm under normal circumstances. The problem I am having is when the car goes to do a double gear downshift. I normally test this while I am on the freeway. If I give the car so much throttle it will downshift to 3rd with no problems. But if I give it enough throttle to cause a double gear downshift it seems like 2nd doesn't apply. Then when I let off on the throttle enough something does apply (not sure if it is 3rd or 4th). I was thinking it had something to do with the servo asembly or apply pin. I have the transmission out now because of an engine swap. I believe I used the apply pin from the previous transmission. It may be too short. What do you think? I don't think it is a governor issue. The transmission will upshift at about 5K rpms (in first) from a standing start.

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Old 05-10-2006, 09:25 PM
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Replace the input sprag.
That is the difference between 4th and 2nd on a forced downshift.
Also the reason the 1-2 shift is good; the sprag is already holding
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Old 05-11-2006, 05:52 AM
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input sprag

Would this be something I can do myself or does the transmission have to be completely disassembled?
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