Change T-350 shift points

Bonnewagon

Bonnewagon

Geezer
Sep 18, 2009
6,116
2,300
113
Queens, NY
#1
This T-350 was originally behind a W-72 301 engine and I guess it was set up to shift at a fairly high rpm. Now it is behind a 400 and still shifting way too high for such a torque monster. What is the best way to lower the shift points? Governor? Modulator? I know little about automatics.
 
TURNA

TURNA

Geezer
Jul 24, 2009
7,460
10,067
113
Socialist NY
#2
Yes

start with governor
 
Bonnewagon

Bonnewagon

Geezer
Sep 18, 2009
6,116
2,300
113
Queens, NY
#3
Ok I see some YouTubes showing the governor kits. Do you know if the kits have the parts to lower the shift point? All the references I see claim to raise it. YouTube videos show shaving weight off the stock weights or using lighter ones. I guess I need heavier weights?
 
timo22

timo22

Master Mechanic
Supporting Member
Sep 10, 2012
459
774
93
St. Louis,Mo
#4
I would start with the modulator. Most modulators are adjustable. use a small screwdriver and inside the vacuum end of the modulator is an adjustment screw. I believe you will need to screw it clockwise to lower the shift points. I would try that before digging into the governor..
timo22
 
MrSony

MrSony

Comic Book Super Hero
Nov 15, 2014
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113
Des Moines, Iowa
#5
from what I've surmised, governor only controls WOT upshifts, modulator controls part throttle up/down shifts, and then the detent cable is well, detents. But only upto a certain speed. In my case, since my gear change my car will only downshift 3-2 from 35mph, not 45mph like it used to. I think if I mod the gov. it will let me do it at a higher speed again.
 
Bonnewagon

Bonnewagon

Geezer
Sep 18, 2009
6,116
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113
Queens, NY
#6
That's why I asked. Lots of opinions about what does what. Has anyone actually done it? And if so what did you do?
 
vanrah

vanrah

G-Body Guru
Apr 16, 2013
750
802
93
Near Afton, Wisconsin
#7
Greetings Guys; From my experience Mr Sony is correct!
from what I've surmised, governor only controls WOT upshifts, modulator controls part throttle up/down shifts, and then the detent cable is well, detents. But only upto a certain speed. In my case, since my gear change my car will only downshift 3-2 from 35mph, not 45mph like it used to. I think if I mod the gov. it will let me do it at a higher speed again.
Bonnewagon, buy a new modulator, adjustable for sure, maybe a B & M? And when ya pull off the vacuum hose if fluid comes out you will know you found one problem. No fluid should come out, if it does the diaphragm is ripped! The lower - kick down cable on carb will pull the trans down a gear if adjusted correctly? This cable is related to some ball checks - springs in the valve-metering body as to how, when to pull back to first or second gear. The Governor does control the full on shift. Generally OE governors shift too soon at full on. And yes the B & M kit will allow you to shift MUCH sooner also. I purchased two kits allowing me to dial in to a 100-200 RPM range. With only one kit you will be challenged to get within 400 RPM of where ya want to be. Hope I helped, Ole' Bob.
 
Bonnewagon

Bonnewagon

Geezer
Sep 18, 2009
6,116
2,300
113
Queens, NY
#8
Yes Bob, thanks. I was looking at the modulator first because in my old Firebird I had found and adjusted that little screw inside the hose end. As I recall it really didn't do much. I've never seen fluid come out so I guess I have been lucky so far. I had been told about the governor but I have never even opened one so I am on a learning curve here.
 
TURNA

TURNA

Geezer
Jul 24, 2009
7,460
10,067
113
Socialist NY
#9
I had those adjustable modulators, never seen any change with them.
 
Bonnewagon

Bonnewagon

Geezer
Sep 18, 2009
6,116
2,300
113
Queens, NY
#10
Turna does a governor kit come with stock weights? Or are they all lighter?
 

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