How to increase shift pressure on 727

[MoparMotel]

Hey,

Tried searching but didn't find what I was looking for. My 727 was rebuilt with a good shift kit a few years ago. Not sure what shift kit but the tranny would shift very firm and if you were on the throttle would bark the tires when shifting. I had some work done on the motor and the mechanic didn't know that's how I wanted the transmission and tells me " oh and I turned down the shift pressure on your transmission for you, it was shifting too hard" when I pick up the car. Now the transmission doesn't shift as firm as it did and barely screetches the tires.

I want to turn the pressure back up to make it shift perfect like it did before, is this an adjustment that is on the outside or inside the pan?

Thank you

Nick

[MoparMotel]

I'm looking at my '68 service manual and on page 21-56 it says to adjust line pressure removal of the valve body is necessary. I know the mechanic didn't take the time to take the valve body out to adjust it otherwise he would have charged me for it. Wonder what he could have adjusted on the outside that would make it shift not as firm?

[red69superbee]

if he took the transmission pan off, you could reach in there and maybe get to the adjustment, When you put in a transpak type shift kit, it tells you how to adjust the pressure.Its with an allen headed long screww in with a little cage on the valve body

[Charger RT]

take it back to him and tell him to undo what he did. You didn't ask him to do that correct? He should have asked you first before doing it.
Tim

[A383Wing]

it's adjustable with an allen screw I think.....valve body does not have to come off.....I just don't know which way to turn the screw....it's been so long since I did mine

Bryan

[oldkimmer]

....He prolly adjusted the kick down linkage at the carb......ur manual tells u how to adj it.....turning the rod out legnthens it and delays the shift....kim..

[MoparMotel]

The kick down is adjusted properly, I double checked that. So to get it to shift firm like it did I'm going to have to drop the pan and turn the allen head to increase pressure?

I'm not taking it back to the guy that did it... We almost sued him because the bill was over double the estimate, plus the car had more problems when it left than when it went in. Also it took almost a year when it was suppose to take 1 month. Decided to just take the car home.

Now I am trying to fix the problems with the car myself. I'm tired of paying local mechanics that have no freaking clue how to work on a classic charger/ mopar.

I started another thread about purchasing a new vacuum gauge and timing light to tune the car myself. I'm going to learn to work on this car myself and save myself the money plus the headache of paying $75-90 an hour and the car not being fixed when i pick it up.

Thanks for the info!

[Cooter]

There is an allen head screw on the driver's side. Turn it Counterclockwise to increase spring pressure which increases line pressure. Clockwise decreases spring pressure on the valving. it is assbackwards to the way you would think, but it works. However, it takes quite a few turns to increase line pressure enough to make it worthwhile. Something like 11/32" measured from the VB to the end of the spring cage or something like that.

[John_Kunkel]

The kick down is adjusted properly, I double checked that. when i pick it up.

How did you check it? I'm with some of the others, I doubt if your mechanic went into the trans to adjust the line pressure, when he said he "turned down the shift pressure" he probably just readjusted the TP linkage.

[MoparMotel]

The kick down is adjusted properly, I double checked that. when i pick it up.

How did you check it? I'm with some of the others, I doubt if your mechanic went into the trans to adjust the line pressure, when he said he "turned down the shift pressure" he probably just readjusted the TP linkage.

I followed the instructions of the '68 service manual.... Lined up the holes on the linkage put a rod through them and adjusted the linkage until it was snug against the throttle shaft.

[John_Kunkel]

Yes, but it might have previously been adjusted to raise the shift points higher/firmer. If that's the case, when your mechanic "turned down the shift pressure" he adjusted it to factory specs.

[MoparMotel]

What would make it shift firmer like before.... Screwing it a little more out or in?

[red69superbee]

seems like screwing it in to push on the pressure valve harder increases line pressure...

[John_Kunkel]

Lengthening the top rod (screw it out of the slotted end) will make it shift later/firmer.

[A383Wing]

Lengthening the top rod (screw it out of the slotted end) will make it shift later/firmer.

yea...