domestic auto trannies
07-03-2003, 04:45 PM
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domestic auto trannies
domestic guys.....
rob isnt here for me to ask this question so i come to the board.
with the trannies that have high stall speeds, are they adjustable? is there an electronic box that say, on the strip i can turn it up to 4500rpm on slicks, then when back on the street i can turn the stall to 2,000rpm??
say i'm on the street i dont want it kicking up to 4500 and then have it lock and feel like i just dropped the clutch and chirp the tires and shit.
i've never owned an auto or a domestic please be nice.
rob isnt here for me to ask this question so i come to the board.
with the trannies that have high stall speeds, are they adjustable? is there an electronic box that say, on the strip i can turn it up to 4500rpm on slicks, then when back on the street i can turn the stall to 2,000rpm??
say i'm on the street i dont want it kicking up to 4500 and then have it lock and feel like i just dropped the clutch and chirp the tires and shit.
i've never owned an auto or a domestic please be nice.
07-03-2003, 05:21 PM
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I can't remember the company, but someone out there makes several different converters for "switch-pitch" TH400 trannies. They're an older tranny, but search around for "switch-pitch transmissions" and I'm sure you'll find exactly what you're looking for.
07-03-2003, 05:23 PM
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No, you can't adjust stall speed. That's a product of the size of the converter, the fins inside the converter, and the torque that your motor is making. It's not going to flash to 4500 at part throttle coming off a stoplight anyway though. Just as long as you ran a pretty good size tranny cooler, or 2 big ones like I do, then you'd really be fine driving a car around with a high stall converter in it. I think what you're looking for is an electronic transmission with a lock up converter. Baumann makes a TCM for the Ford AODE and 4R70W where you can set the converter to lock up at whatever rpm you want it to in 3rd and 4th gear. You could also just run a regular, non-electronic transmission with a lock up converter though. I've gone as high as a 3500 rpm stall lock up on a street car and didn't have any complaints about drivability.
07-04-2003, 05:52 AM
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Originally posted by Blasphemous
I can't remember the company, but someone out there makes several different converters for "switch-pitch" TH400 trannies.
I can't remember the company, but someone out there makes several different converters for "switch-pitch" TH400 trannies.
Switch-Pitch Info: For those of you unfamiliar with a switch-pitch, it is a custom converter with movable vanes which allows them to change pitch and vary the stall speed. The transmission required a special input shaft (ours is hardened in this case) and front pump housing for a solenoid. The solenoid raises the fluid pressure which changes the pitch of the vanes in the converter. This allows you, at the touch of a button, to change your stall speed. High stall converters are great at launch, but are very inefficient everywhere else because they allow slippage, that's what enables them to stall so high, so you don't get those tire-barking shifts. With a switch-pitch, I can launch in high-stall mode (4000rpm) and as soon as the vehicle settles, press the button on my shifter and it will lock up the torque converter instantly barking the tires as if I had shifted gears. It will continue to bark the tires through the rest of the gears because the torque converter is fully locked up. This makes for more fun on the street and better quarter mile times. How often to you get to get your cake and eat it to?
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07-04-2003, 06:15 PM
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Originally posted by Nic
No, you can't adjust stall speed
No, you can't adjust stall speed
Eng, good quote you threw in there. That kind of makes it sound like all it does is lock-up the tranny. It actually lowers the stall so far that the tranny will lock up from normal operation (i.e. it locks up at high speed/rpm).
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