well i raced my car last week and i think my car is way over stalled. I am useing a 9-1/2 ati converter that was soposed to stall 38-4200 behind a 340 small block. but in my 73 440 dart i can make it stall in frist gear around 5200. at the track my car would flash stall around 5600. my car seemed to run the best at shifting at 6200.my best pass was a 11.85 at 110.9. I was crossing the strip right at 6000 rpm. does anybody know how to figure converter slip? I am useing 4.10 gears and 275/60/15 m/t street radiels.this is a street strip car so what do you guys recomend for stall speed.thanks Mopar65

roll along in high gear a few mph and matt it for a second looking at the rpm's.

what stall speed you need epends on what you are looking for and what kind of suspension you have. where did you buy your converter? didn't you talk about this before buying?

Take a look at TCI's race calc. page. It may help you figure out converter slippage. Depending on your setup, trans brake, or not, you might try leaving tree at a lower RPM, and shifting lower. Surprises alot of folks that this practice can actually improve ET's. Goes against everything we think we know!
http://www.tciauto.com/Products/TechInfo/calculators.asp#7

hi quick this is going to be a 50/50 car when i say street car i mean nomore than driveing 30 miles one way.i have a stock front end and rear is mopar 002/003 super stock springs and mopar long drag shocks.I bought the converter used off a member here on the board.yes i talked to the member and he said it stalled 38-4200 behine his small block 340.this 440 i have in my car is nothing special so thats why i thought it might work fine for mine. I saw last night that summit sells a 3800-4200 turboaction converter for a 727 what do you think about them? thanks Mopar65

thanks for the link going by the info i put in it my conv slip % is 9.96503

is that good or bad? thanks Mopar65

thanks for the info mike. so are you saying my stall is ok now or is it to much.I know quick tree said to check it in high gear. but i can rev my car to 2000 rpm in frist gear and go wot on my shop floor. my tach will hit 5200 easy,now just hold the brake pedal in frist gear and bringing the rpm,s up my car will hit 4000 easy. sorry i dont know if these are the answer you are looking for. just trying to give you all the info that i know. if this helps i have a comp cams 305-525 hydralick cam and have 165 psi cranking compression.it seemed like i was racing a 2 speed trans the night i went racing.i mean i am probly wrong but it seems like i was shifting out of frist gear right before or right after the 60 foot mark. do you think a 1.64 60 ft is good for a 11.85 pass? i also ran a 7.57 at 90.8 in the 1/8 mile. thanks Bobby

Doing the stall from a small roll and in high gear
is actually better(you have less ratio to spin the
tires to get a better reading). You have either too
much stall or you need to move the shift point up
much higher(and you might not be able to do that with
the cam, heads etc.,etc) it would be nice if you knew
what your peak torque rpm is. The 60 is slightly slow
but not bad.... which could be with all the low end
slippage of the converter

Generally Convertors are very torque sensitive,not horsepower. I've tried one of our SS/AH convertors in my 700tq wedge and stalled at 7600. AH motor makes power 1500 rpm higher than my wedge. Of course the starting line spectators thought I broke, but it just flashed on the chip and made me look stupid. Get a nice one made for the car, Turbo Action is fine no need for spendy race convertor. Avoid cheap ones from places and people unknown. Plenty of guys right here.

thanks for the help guys. mike my car seemed like it was done pulling after 6200 rpm. I think when i ran my best pass the 11.85 was shifting 5900-6000. I tryed shifting over 6200 but the car did not like it. But i was haveing carb ing issues that night allso.this same engine in my old 65 plymouth. with everything the same except my 65 had a no name 3500 stall, 430 gears and 30x9 slicks would run 9.90 at 105 in the 1000 ft.my best pass in my dart was a 9.94 at 102.my best 1/8 in the 65 was a 7.45 at 91 and my dart was a 7.57 at 90.3. my best 60 ft in the 65 was a 1.53
I rememberd that my 65 ran great with the 3500 stall. so i thouhgt my dart would run fine with the soposed 3800-4200 stall that it thought i bought.which my dart might run better if i can get my topend miss figured out.thanks Bobby

You need to remember that its a torque converter...
as the torque goes up so does the stall point and if
that converter was built for a SB and you put it behind
a BB its going to stall more, us SB guys struggle to
make torque, not with the BB... its hard to say what
the stall differences would be without knowing the
differences in the amount of torque and at what RPM
for each engine

Paul @ TA was very helpful.
When i pulled the convertor out of the 65',,,it needed some adjustments,,,and he got it right the first time...
good luck bobbie.

Turbo action for me but I wouldnt hesitate to call Lenny as everything I have seen he cares and that is important.

quick thanks for the phone number to turbo action I talked to Paul tonight and he recommended his turbo action 17805ST 10 inch 3800 stall. so i think i will give it a try.thanks guys mopar65