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  #16 (permalink)  
Old 11-12-2011, 11:14 AM
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Quote:
Originally Posted by Crosley
the pressures are fine for a good operating street unit.

the two mods to the 1-2 shift valve area are simple. Sounds like the hole was plugged well. The land was ground on the shift valve per instructions?

Did you perform any mods to the smaller accumilator valve on the other end of the valve body from the 1-2 shift valve bore?

Glad to see that the pressures are good.

Yes, I ground the two flats on the lands of the shift valve as indicated. I also removed the spring from the accumulator and installed the 5/16" set screw in the 3rd accumulator feed passage. Is this the other mod that you are referring to?

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  #17 (permalink)  
Old 11-12-2011, 12:47 PM
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this valve:

Spring on the outside end of the valve is softer 1 - 2 shift = light to medium throttle. A spring on the inside will firm up the shift 1-2.

The outer spring OEM setup is too large to fit inside the valve bore first. Many springs work inside bore first. Powerglide direct piston spring, the stiffer governor GM type springs

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Old 11-12-2011, 12:55 PM
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Quote:
Originally Posted by Crosley
this valve:

Spring on the outside end of the valve is softer 1 - 2 shift = light to medium throttle. A spring on the inside will firm up the shift 1-2.

The outer spring OEM setup is too large to fit inside the valve bore first. Many springs work inside bore first. Powerglide direct piston spring, the stiffer governor GM type springs

Now, I am feeling a bit stupid. I see what valve you were referring to, but I am not clear as to what you are suggesting I do.

DO yopu think that this mod will resolve the fact that it wont shift at all ever from 1-2 manually?

When driving in "D" it really feels like it goes from 1st to 3rd, but when I downshift from 3-2-1, I get all of the gears. The shifting is almost not felt at all on the upshift.

Thanks again..
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Old 11-14-2011, 04:26 AM
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Yesterday I got the opportunity to drop the pan and VB in order to double check the valve assemblies. When I dropped the VB, the 2nd gear piston dropped out with its spring, spring cup, shaft and clip. The clip was definately bent and distorted which makes me wonder if this is where the shifting problem lies.

Does anyone have an exploded view of these parts so that I can confirm which side of the piston the clip goes in the grooved shaft? Also the overall assembly order of these 4 parts?? I am working from a technical DVD and dont have a book to reference.

To that end, can you recommend a good th400 rebuild manual, or somewhere I can see good exploded views of the VB valves.

Thanks...
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Old 11-14-2011, 05:29 AM
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Quote:
Originally Posted by Mr. Fixit
Yesterday I got the opportunity to drop the pan and VB in order to double check the valve assemblies. When I dropped the VB, the 2nd gear piston dropped out with its spring, spring cup, shaft and clip. The clip was definately bent and distorted which makes me wonder if this is where the shifting problem lies.

Does anyone have an exploded view of these parts so that I can confirm which side of the piston the clip goes in the grooved shaft? Also the overall assembly order of these 4 parts?? I am working from a technical DVD and dont have a book to reference.

To that end, can you recommend a good th400 rebuild manual, or somewhere I can see good exploded views of the VB valves.

Thanks...
that is not the 2nd gear piston. It is the servo for the coasting band.


There is a book by a fellow Ron Sessions on the t-400. Some info is out of date, but the book is a good reference material from comments I have read.
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Old 11-14-2011, 05:31 AM
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Quote:
Originally Posted by Mr. Fixit
Now, I am feeling a bit stupid. I see what valve you were referring to, but I am not clear as to what you are suggesting I do.

DO yopu think that this mod will resolve the fact that it wont shift at all ever from 1-2 manually?

When driving in "D" it really feels like it goes from 1st to 3rd, but when I downshift from 3-2-1, I get all of the gears. The shifting is almost not felt at all on the upshift.

Thanks again..
spring on outside of valve = softer shifts. Spring on inside of valve = firmer shifts.

the 'no 1 - 2 shift' problem you describe, this will not fix that. You still have some other problem. I am not sure what
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Old 11-14-2011, 07:36 AM
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Ron Sessions does have a TH400 book but, for some reason it's worth it's weight in Gold. >> http://www.amazon.com/Modify-Hydra-M...820778-8391747
His TH350 book is cheap.


Here's a few TH400 Links I've saved:
http://cogpro.com/chapters/P-TurboHydraMatic/index.htm
http://www.teufert.net/trans/t-400.htm
http://www.kilgoretrans.com/html/kilgore.html
http://www.bdub.net/tranny/TH400SuperBeefing-text.pdf
http://www.turbobuick.com/forums/tra...-pictures.html
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  #23 (permalink)  
Old 11-14-2011, 04:05 PM
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Quote:
Originally Posted by Crosley
that is not the 2nd gear piston. It is the servo for the coasting band.


There is a book by a fellow Ron Sessions on the t-400. Some info is out of date, but the book is a good reference material from comments I have read.
Ar you referring to the "piston" in the case directly above the 2 -3 accumulator in the valve body? On the Jake's site he references this as the "2nd servo" If this is the same set of parts that I am referring to, does the clip go above the pistonnear the spring. I will check out the book that you referenced too..

Thanks..
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Old 11-14-2011, 04:06 PM
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Quote:
Originally Posted by SSedan64
Thanks for the info , I will check out the links that you have provided..
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  #25 (permalink)  
Old 11-19-2011, 03:29 PM
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Here is an update of the situation. I sprung for the book by Ron Sessions. Apparently they are very proud of it $$$ . I did some studying and then dove back in to the tranny.

I checked every valve in the valve body very carefully to be sure that they moved easily in the bore and were assembled correctly. All seemed perfect. I did make one more change small to the 1-2 accumulator valve that Crosley had referenced to firm up the 1-2 shift. I also did note that the front servo was not assembled correctly so I corrected that and then re-assembled everything.

I took the car for an easy test drive around the block and everything worked fine in "D". Then I tried manual from 1-2 and everything seemed fine for the first time (although it isn't sharply switching gear, more of a brief "slip into gear"), then 2-3 and again all was good. Downshifting was perfect. Next I put it in 1st (ratchet) and pulled the rpm up to 4500. When I shifted to 2nd nothing happened, it stays in first as it did before. So again I slowed down and tried the same exercise at 2000 rpm and it worked ok.

Now, with all of that said, does anyone have a suggestion of what to check next, or what it could be?
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