Moparts Tech Archive
Adjusting Line Pressuremoparmac
Registered: Dec 2001
posted 06-30-2002 02:56 AM
Exactly how do you increase line pressure in an auto 904? Where is the adjustment at? Driver's side of passenger side? I see in the manual there is an adjustment on the passenger's side, but what is the lock nut/adjuster on the driver's side right about the linkage that goes into the gear selector? Thanks! Need info quick because i am doing this tommorrow,,, Also, which way increases/decreases and how sensitive is it? 1/8 turn increases a lot? little? thanks!!!!
Lengthen the adjustment on the linkage that goes from your throttle to the top transmission lever on the driver's side.(kickdown) This will increase line pressure, generally cause your shift points to be higher, and your kickdown (3-2 downshift) will be affected as well. You will know that you've gone too far when you can't get any upshift into high gear. The only other way is to pull the pan and adjust the pressure on the valvebody by turning the allenbolt counterclockwise to increase pressure. The adjusters you speak of on the other side of the tranny are band adjusters, I believe.
I adjusted mine by opening the throttle to wide open then adjusting the rod till it had 1/8 inch left till it was full rearward. I have over 10k on the new tranny and it shifts nice and hard!
In the tech archives it shows that on the passenger side there is an adjusment for line pressure
The line pressure adjuster is a hex socket on the drivers side of the valve body (must remove pan) near the shift shaft. Using a 3/16" Allen wrench turn the adjuster counterclockwise to raise the line pressure.
The previous post shows the ports for testing the various pressures. They are pipe plugs that are removed to hook up a test gauge.
John, how many turns do you usally turn yours out for a nice crisp shift?
Removing the accumulator spring does nothing to improve upshifts, blocking the accumulator piston will improve the 1-2 upshift.
I adjust the kickdown so it is all the way when the car is at WOT...
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