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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: GM400
> Now I have made the brillaint discovery that my trans ('84 XJ-S) shifts at
> 22-2300 rpm under acceleration. This suggests that the high stall converter
> would have no effect unless I raise the shift points.
The shift points are primarily determined by the centrifugal governer driven
by the output shaft. That means the shift points correspond to road speed
instead of RPM. If you have a converter with a flash speed of X, then the
engine should get to X RPM shortly after you nail the accelerator pedal and
stay > X until the 1-2 shift occurs (actually normally till you let off
the throttle).
Incidentally, the 1-2 shift under full-throttle and with the kickdown
engaged is supposed to occur around 55mph which should correspond to
something like 5000rpm. Without kickdown and under heavy throttle
it should be near 45mph, and under light throttle 5-10 mph which would
of course be way below stall speed. Your shift point of 22-2300 rpm
sounds like a transmission problem to me.
Thomas E. Alberts
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