Boxes, downloaders and auto trans pressure

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Oct 26, 2006 | 04:10 AM

#16

Dodgezilla

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Joined: Aug 2002

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From: Northern Virginia

Under normal driving conditions it is true. I can turn my TST on 9/9 and my truck will run fine if I'm just tooling around town without getting into it hard. The big problem occurs when you hook a trailer up behind that truck and it seems to tow it so easily when the boxes are turned up. It's towing it easily alright but all that torque is wreaking havoc on the trans...

Oct 26, 2006 | 08:26 AM

#17

bluebull

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Joined: Apr 2004

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From: Where hell freezes over.

Quote:

Originally Posted by raychem

If your refering to line pressure....no less throttle does not mean less pressure. Your VB has what is called Base Line Pressure...which means once the engine starts and the trans pump is running...it will supply that pressure period. Now if your low on at fluid you will see a drop in that pressure.

Richard

I'am not going to go into detail, leave that for the tranny wars. So that's why your pressures are around 65-75 psi at idle and the more you increase throttle the higher the line pressure becomes all the way up to around 150 psi or higher on modified transmissions. Your unmodified transmission does the same thing except the pressures are not as high as a modified one. the modified transmission also bring on the pressures faster.