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Will talk to my builder about the line bias spring. Took it out after work and 3-4 didn't feel "firm", no slippage. Maybe I need more pressure after all.

So what would you do to increase just the P,N,D,3 high pressures to say 230?

Lonnie what I mean as passable is, my pressure on the hi side for P,N,D and 3 are low for your specs but by what Ttype6 says I'm OK because of the HP my engine makes (let's say about 350). So making 200 vs 230 is still in the ballpark for a unit to last.

Ttype6 thanks for your answers to my questions. Being my engine doesn't have high HP numbers I can see now that the pressures will be OK for my application.

Why does a place like Jakes Performance and Extreme Automatics post higher pressures for P,N,D and 3? Where would be the point when higher pressure is at a good or passable point? Also was the low/reverse boost valve changed to get the increase in pressure from original readings?

Got the car back, the rebuilder says he changed one spring in the governor (lighter). Unit now shifts 1-2 at 15 mph all other shift points remain the same. Here is the pressure readings after the change. All done at 1100 RPM. Had done test at 1500 RPM but pressures were about the same also. P...

I looked at the pressures again and reverse is low for the high side. Thought maybe the low/reverse boost valve could be a problem. I have a 91 TPI (OEM) with factory brackets, 86 CZF trans and 86 3.73 rear, all in a 83 Monte Carlo. I just came back from the rebuilder and he wants to put a...

No I haven't done any of this yet. I'm going to give these pressure readings to the person who did my tranny and see if he will correct the pressure problem. If he won't it looks like it's up to me to find/repair the problem. Of the three area's you want inspected which one would be more likely...

Yes it has both springs. These are the Min/Max pressure readings I got yesterday, trans was at operating temperature, TV cable adjusted correctly and it's a CZF trans. P 75/190 R 120/160 N 75/190 D 75/170 3 75/170 2 175/160 1 160/150

My unit has just been rebuilt. The shift point is 5 to 7 MPH. I understand that the spring is incorrect and need a heavier one. I haven't taken a pressure reading yet. To have the 1-2 shift at 15-20 what pressure would be correct? Or what would be the correct dimension of the spring to use...