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Tume an A727 to it's torque converter?

1STMP

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Do I need a lower stall converter,
or can the 2-3 shift be
dialed in?
When building the chassis,
much of the weight was
guesswork and a torque
converter was purchased
to those numbers. It's
stall (advertised) is 2800
rpm. 440 has a mild cam
and the rear diff has 3:55's.
Total weight with two
passengers is 3100 lbs.
1-2 shift is strong at about
25-30 mph, but the 2-3
shift is wanting 45-50 mph.
it does shift before then but
you have to lift the pedal
slightly, and the shift is
soft.
Thanks in advance for
your input.
 
.
1-2 shift is strong at about
25-30 mph, but the 2-3
shift is wanting 45-50 mph.
it does shift before then but
you have to lift the pedal
slightly, and the shift is
soft.
Thanks in advance for
your input.
Sounds like tweaking the kickdown linkage would be a good starting point...
1-2 shift should occur at under 20 mph under light throttle... So 25-30 points to high TV (throttle valve) AKA kickdown pressure.. 45-50 2-3 confirms that... When you lift it shifts earlier because the kickdown pressure dropped... When it drops a soft shift is expected... Under heavier throttle firm late shifts are expected...

Shifts are a balancing act between line pressure, governor pressure & kickdown/TV pressure.... The easy adjustment is TV/kickdown so start there....
 
Do I need a lower stall converter,
or can the 2-3 shift be
dialed in?
When building the chassis,
much of the weight was
guesswork and a torque
converter was purchased
to those numbers. It's
stall (advertised) is 2800
rpm. 440 has a mild cam
and the rear diff has 3:55's.
Total weight with two
passengers is 3100 lbs.
1-2 shift is strong at about
25-30 mph, but the 2-3
shift is wanting 45-50 mph.
it does shift before then but
you have to lift the pedal
slightly, and the shift is
soft.
Thanks in advance for
your input.
Your question was on the 2nd.....did you get this lined out? Was going to ask if your kick down lever is moving at the same time your throttle moves. If it isn't fix it but usually when it's not moving in unison, shift points are early...
 
Thanks for the follow-up,
@Cranky .
Got the 1-2 shift set at about
20mph, but 2-3 doesn't come
in until about 2800 rpm on
it's own. I can get it to shift
before then with a
momentary lift of the pedal.
I'm thinking I have too much
stall. When I stand on it, all
hell is unleashed, but don't
like doing this much until
things get broke in a little
more. There's less than 500
miles on the drivetrain.
 
Thanks for the follow-up,
@Cranky .
Got the 1-2 shift set at about
20mph, but 2-3 doesn't come
in until about 2800 rpm on
it's own. I can get it to shift
before then with a
momentary lift of the pedal.
I'm thinking I have too much
stall. When I stand on it, all
hell is unleashed, but don't
like doing this much until
things get broke in a little
more. There's less than 500
miles on the drivetrain.
I'm no expert on automatics but do know a bit about them but can't really help out on why the 2-3 isn't coming in......
 
The stall speed shouldn't effect shift points, the governor controls shift points.... Usually guys are fighting early shifts so high shift speeds could point to a sticking spool in the governor..
 
The stall speed shouldn't effect shift points, the governor controls shift points.... Usually guys are fighting early shifts so high shift speeds could point to a sticking spool in the governor..
Thanks, @1 Wild R/T
I'm going to run it to a
friends transmission shop
and have him check it out.
The transmission sat for a
few years before being filled
and run. Don't know if this
would cause any issues with
its' performance.
 
I can get it to shift before then with a momentary lift of the pedal.

the shift points can be adjusted some by adjusting the throttle pressure (kick down) linkage. The setting on your vehicle could be too high, causing that momentary lift on the throttle to shift.
 
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