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Old 03-29-2008, 01:41 PM
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700R4 Line pressure test

I just finished rebuilding a 700r4 (supposedly) and the maximum line pressure I got in all gears with regular and full TV cable pull is 50 lbs.

Any thoughts ?

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Old 03-29-2008, 02:14 PM
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Quote:
Originally Posted by 123pugsy
I just finished rebuilding a 700r4 (supposedly) and the maximum line pressure I got in all gears with regular and full TV cable pull is 50 lbs.

Any thoughts ?


too low... very minimum should be around 65-75 psi , hot
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Old 03-29-2008, 05:46 PM
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Originally Posted by Crosley
too low... very minimum should be around 65-75 psi , hot
Thanks for the great advice Crosley. With this I deduced that the TV Boost valve was installed backwards. I opened her up and sure enough it was. I shoved it back together and the whole pressure regulator valve got blown out into the pan. Opened her up again and stretched out the circlip and reinstalled it,put it in reverse and pressure went up and dropped to zero. I think it blew out again but I've had enough for today. I will open it up again in the morning.
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Old 03-30-2008, 07:42 AM
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I've got the valve back in properly ( I think) , pressure is up but now it won't shift out of 1st and in 1st feels a bit spongy. Reverse engages firmly.. The engine also lopes when I put it in gear.????
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Old 03-30-2008, 07:47 AM
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Quote:
Originally Posted by 123pugsy
I've got the valve back in properly ( I think) , pressure is up but now it won't shift out of 1st and in 1st feels a bit spongy. Reverse engages firmly.. The engine also lopes when I put it in gear.????

boost valve must remain in position in the pump for pressure. Sitting in the pan is not good,

not up shift? TV cable adjusted? Minimum adjustment is important too IF the fail safe check ball is installed.

Worn TV bore can cause "false fail safe" condition to.

Governor is stuck = no shifts.

Governor gear broken = no shifts

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Old 03-30-2008, 12:15 PM
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Got it! It was the boost valve not inserted correctly or jammed up. I guess I was too frustrated and tried to rush it.

Shifts really good now and huge improvement over the TH350.

Thanks,
Pugsy
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Old 03-30-2008, 12:18 PM
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good news to hear / read.

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