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Old 08-28-2007, 09:23 AM
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700R4 Pressures

I did a pressure test on my rebuilt 700R4, I first did a road test and after about 10 miles while trying to get it to kick into 4th gear lost 3rd and fourth,
TV cable is adjusted fine and I did the pressure test to determine if the 3-4 clutches were gone.

The pressure I got was about 75 in all gears and it would not fluctuate from idle to WOT. Can someone give me some advice on this. I also installed a Transgo kit when it was rebuilt. Thanks

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Old 08-28-2007, 10:40 AM
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700R4 pressures

Yellabelly, will you do another pressure test like this? With the trans warm, check all pressures at idle. Then pull the TV cable to max TV. please write them down.

Then, with trans warm, raise engine speed to about 1200 rpm's, write down all of the figures. Then at 1200 rpm's pull the TV cable to max TV, and write them down.

Park, neutral drive and third, the pressures should be the same, no more than a 10 pound fluactuation. This is a good test for the integrity of the pump. You will see a problem with the pump if pressures go up above 10psi, from idle to 1200rpm's.

At 1200 rpm's at max TV the pressures should be double the idle amount, except first, second and reverse.

First, second and reverse, the pressure should be higher, by about 25psi,than park, neutral, drive and third, at idle

Second and first pressures do not increase with max TV, any TV for that matter. But in reverse, with max TV, your pressure should be twice as much.

Your readings that you posted, show no line rise,= assembly error in pressure regulator area, boost valve etc.

Go grab your gauge and please post results!
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