What is "proper" 47re line pressure? - Dodge Cummins Diesel Forum
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98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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Old 12-20-2008, 03:16 PM   #1 (permalink)
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What is "proper" 47re line pressure?

Hey fellas. I got a chance to measure the line pressure in my 24 valve 47re. The transmission still shifts fine, but I want to make sure I keep it that way. I bought the truck about 20,000 ago used. The original transmission went and was replaced about 90,000 ago, but that's all the owner really knew, he wasn't sure what exactly was put in or if the old one was rebuilt.
It is a 99 transmission case with a <97 valve body. At idle the line pressure was about 55-60#, at 3,000 it was about 85-90#. I tried to research it, but I can't really find a standard for stock 47re transmission pressure. What do you guys think?

I'm just wondering whether I should leave it be since it's still shifting good after 90,000 or if I should put in a shift kit to improve it's life. She's gonna get used for towing, but there isn't any power mods.
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Old 12-20-2008, 03:33 PM   #2 (permalink)
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I have a book on it, but its at another house... But I'm pretty sure stock at idle is anywhere from 50-65. My suncoast is set at 85-90 at idle....
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Old 12-20-2008, 03:59 PM   #3 (permalink)
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From the FSM.

Overdrive clutch (Fourth gear only) Pressure should be 68-72 psi with closed throttle and increase to 90-130 psi at 1/2 to 3/4 throttle.

Line pressure (at accumulator) Closed throttle- 54-60 psi.

Front servo (Third or Fourth gear only) No more than 3 psi lower than line pressure.

Rear servo (1 range) No more than 3 psi lower than line pressure. (R range) 160 psi at idle, builds to 270 psi
at 1600 rpm.

Governor (D range closed throttle) Pressure should respond smoothly to changes in mph and return to 0-1.5 psi when stopped with transmission in D, 1, 2. Pressure above 1.5 psi at stand still will prevent transmission from downshifting

Hope I got this right. I had to edit and do copy and paste to get it here and look right.
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Old 12-25-2008, 04:37 PM   #4 (permalink)
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hey thanks a lot guys. that really helps cause i hear the pressure is the best way to judge the health of you transmission.

is it best to leave a stock transmission at stock pressures?
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