[DaleO]

I am just not sure which is which. I've installed a Hayden cooler in what I thought was after the radiator but I thought I would feel a difference touching each line but they seem the same. I hoped to have felt a difference. I suppose that is like determing your ET by the seat of your pants. Right now I have the system set up thinking the top port is the return to trans.

The TH400 had a complete rebuild with a brand new TSP 9.5 convertor.

[TCSGTO]

You are correct, bottom port is to the cooler, top is the return.

[pastry_chef]

Originally Posted by DaleO

Right now I have the system set up thinking the top port is the return to trans.

Correct for TH400

[DaleO]

Excellent, I really appreciate your help.

[DaleO]

An update of my fresh TH400 and new torque convertor.

I've finally got the goat back on the ground. This is a 1967 with 428, TH400, 3.23 and TSP 9.5 torque convertor. Since this is my 1st experience with a higher stall than a factory 13" I'd appreciate your experience.

When I ease into the throttle from a stop it kind of feels like letting a manual clutch out slow and easy. It cruises along fine once it "finds" it's gear but with slight throttle changes it feels loose again. When I get off the throttle all together as in coasting down a hill it feels as if the trans totally decouples.

But when I nail the throttle it gets up and goes! It seems a solid hookup at this point.

I think this is the way it works and I will just need to get used to it. Does this all sound about right?

[Half-Inch Stud]

That is called a mushy converter; the combo is the cause. 3.23:1 will do that. 9.5" does that. 10" ATI for tight.

[chuckies76ta]

Yes, I would agree with Half Inch Stud. Probable loose converter with gearing. Be interesting to know what it flashes too. You've taken a big jump from a 13" converter to a 9.5". From what I understand about flashing the converter, you put in second gear at 15 mph and mash the throttle to see where the rpm's go to. A little read: http://www.hughesperformance.com/tc-stall/
Also, make sure you mount your tranny cooler properly. Fittings pointing sideways or top, but not pointing down. FYI.
TCS makes a nice 10" that would work great in your car. I have one sitting here with hardly any miles on it if your interested. I went to a 9" with new combo.
TCS: http://www.tcsproducts.com/

[RocktimusPryme]

Check your fluid level. I also have a TSP 9.5 with highway gears. When I first installed mine I was thinking "oh man what have I done!" It felt so loose from a stop. But after letting the transmission circulate fluid, I topped it off again and it felt much more normal.

I had already had my transmission and only swapped the converter. The one big note is that the looser TSP made my 2nd gear shift softer. It used to feel super snappy with the old full size converter.

[lust4speed]

Easier and less stressful method of finding stall speed is to disconnect the 12 volt kickdown wire to prevent downshifting. Putter along at 35 MPH in high gear and stab throttle to the floor. Car shouldn't shift down and will allow converter to flash for several seconds to get an RPM reading before road speed starts to catch up to converter slip.

[DaleO]

I was able to take a quick trip around the countryside this morning to warm the trans up and then make a test for the stall I am getting.

I did two things, the first I started from a roll in high gear and at 15-20 mph nailed it to the floor. I tried this twice with inclusive results because it is a narrow road and it got narrower with with spinning tires and wiggly rear. I just wasn't quick enough to look quick enough between the tach and road to catch the flash rpm. It came in between 2k -3k rpm, I think, but we probably already knew that, ha. The second thing I did was to powerbrake to the point where the tires just...started...to...turnover. This showed 2,600 rpm.

So the next thing, as suggested, I will disable the lockdown switch and do the same as the first go around. I agree this should make it more comfortable to watch the tach.