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Username Post: On the 700R4 not being able to shift into OD at wot.
Senior Member
Posts: 551

Loc: CA
Reg: 07-18-00
11-11-21 01:03 PM - Post#2830630    
    In response to jbander

  • jbander Said:
There is a valve change so that it will shift into 4th at wot. I have heard that the clutches are small on OD in the 700R4 and if you put the valve in . These small clutches may be a problem. I get the impression that is the reason they designed it not to go into 4th at wot in the first place.
I would like to know what the results of people putting in this valve to go into OD at wot. Any experience with this out there.

3rd and 4th (OD) use the same clutch pack. The clutch pack is applied in 3rd; transmission goes into OD when the 2nd/4th band applies (releasing the forward sprag).

If you're going to have an issue with the clutch pack, you'll see it in 3rd before you ever see it in 4th (OD) which is usually the case.

IIRC, the Corvettes came with is valve from the factory along with an improved 2-4 servo.
1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari

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