Re: [AMC-List] 6 Speed GM automatics etc.

["John Elle" <johnelle@xxxxxxxxx>]

SNIP
Maybe it's the lockup converter he's thinking is 4th?
Ken
SNIP
 
Actually I know it is!
But it got your attention!
In general that is what many of the newer electronic 
Automatics are doing, splitting gears by locking and 
un-locking the torque converter. Thus a 6 speed torque 
flite can be created. Call it what ever number you want
by electronic controls and solenoids. You control 
the split by the looseness of the torque-converter. 
Of course with electronics, you precise control as 
to when. 
 
SNIP
Quoting Tom Jennings < <mailto:tomj@xxxxxxx> tomj@xxxxxxx>:
On Tue, 3 Oct 2006, John Elle wrote:
I run a 4 speed 904!
Where is this magical device you speak of!
SNIP
Change the spring tension of the valve that controls 
the pressure that the torque converter locks up at and 
you shift the miles per hour that it locks up at. 
I have mine so it locks up at 55 mph. 
There  used to be kits available for this.
In 1980 there were apparently two available torque 
Converters that you could have as stock, a low and a high stall unit. 
I picked the wrong one, the low stall unit when I had mine 
rebuilt, in the interest of fuel economy. Shortly I will 
purchase a 2000 rpm stall lock up torque converter and 
install it so there will be more affect. The high stall 
torque converter in my AMX has about 500 rpm of slip in 
it before it locks up which is a fair slip factor. (It locks up
at the 39mph level)
The Spirit will have more of an affect when I install the 2000
rpm stall lock up torque converter. 
 
Now if you want to get clever you can also control the slip by 
"Pulsing" the lock up thus varying the amount of slip you have. 
With electronics and transmission control computers you can do 
this. 
However slip and heat are related characters and with today's 
transmissions already doing a lot of this the lack of reliability
is already a proven commodity.  
John
 
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