Subject: RE:Transmission question by PeteK on 2008/1/30 18:47:51
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it is a specialty valve designed to correct the original design which won't allow full throttle upshift to OD.
The Corvette version of the 700R4 is one that allows the full throttle 4th gear upshift. Most others don't.
RACE ON!!!
Thanks for clarification, I didn't realize that was true. I've heard of guys with Vettes having this problem but expect their transmission was a rebuilt unit using a case / valve body from another vehicle based on what you are saying.
Because of the low miles, I assumed he had a stock vette gearbox. The easiest way to check is to look at the bottom of the trans, just behind the rear of the pan. If there are 2 holes that are drilled and tapped to accept a trans mount, then it is a non vette case. Vette cases have that area completely eliminated because they use the tailhousing for support via the support beam. If it is a non vette case, the 3-4 upshift valve is a non vette/policecar version. They are no longer available from GM, but aftermarket versions are available. They require sleeve replacement of the tv plunger, allowing the same end result, a full throttle, wide open throttle shift.
