T-350 7 400 valve body problems? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-10-2008, 03:16 AM
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Valve body question

I have a 1940 Ford coupe with 350 Chevy engine and a tb400 and it changes to fast . It just want stay in the lower gears long enough . I hardly get going and it's in high gear . Also not all the time but most of the time after stoping at a stop sign or red light it well not down shift to low , and I end up taking off in second . I have a Lokar shifter and can change it manually but if I wanted to change gears myself I would have put in a straight gear . Now here is another one . I have just bought a 1972 Chevrolet Pu , 350 /350 and It want change ! I mean it will change if I rattle the valves with very high RPM's . If I do it that way it changes hard and will bark the tires . So when I drive it I have just been changing it myself . it does great then . Both transmissions are new rebuilt and don't slip , they both seem solid but I'm not going to keep doing all the shifting myself ! Is this a valve body problem ?
Ron ,

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Old 05-10-2008, 05:55 AM
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Why would you want a manual?
I can shift my TH400 anytime I want, Or leave it in drive, MY choice.

I had it built locally by Jeff Wingfield and it shifts soft untill you get on it then it blows your socks off. It will shift up or down when I tell it to and the gov is set to do the right thing on the street.

No reason for a full manual IMHO

Keith
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Old 05-10-2008, 07:23 AM
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Quote:
Originally Posted by bigiron40
I have a 1940 Ford coupe with 350 Chevy engine and a tb400 and it changes to fast . It just want stay in the lower gears long enough . I hardly get going and it's in high gear . Also not all the time but most of the time after stoping at a stop sign or red light it well not down shift to low , and I end up taking off in second . I have a Lokar shifter and can change it manually but if I wanted to change gears myself I would have put in a straight gear .

Now here is another one . I have just bought a 1972 Chevrolet Pu , 350 /350 and It want change ! I mean it will change if I rattle the valves with very high RPM's . If I do it that way it changes hard and will bark the tires . So when I drive it I have just been changing it myself . it does great then . Both transmissions are new rebuilt and don't slip , they both seem solid but I'm not going to keep doing all the shifting myself ! Is this a valve body problem ?
Ron ,
bigiron40 ; I split out your post since you posted a new question inside a different thread.


RE: the t-350 trans...

Is the detent cable hooked up from the trans to the carb?

have you adjusted the vacuum modulator on the trans IF it is adjustable? Inside the nipple for the hose on the modulator is a small screw. Thread it in for later shifts.

The t-350 trans not down shifting to first gear at a full stop , usually is a sticky governor. Gov is under the press on round cover near the rear of the trans. Removing the cover is easier than installing it back on. Check for clearance to re-install the cover before removing it.


RE: t-400

Quote:
I have just bought a 1972 Chevrolet Pu , 350 /350 and It want change
In your quote; do you mean to type the trans " will not shift gears automatically"? The t-400 trans will shift only when it hits high RPMS ?

IF my guess here is correct..... then check for a bad modulator valve. Pull the vacuum hose off modulator, IF oil comes out , it is bad.

Check for vacuum to the modulator , at the modulator.

Check the wire hooked up on the drivers side just behind the shift linkage. This is for passing gear. IF there is 12 volts there with the ignition switch "on" , engine = "off " , the passing gear switch is defective or out of adjustment.

check these items , post back when you can
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