T-400 manual valve body 2-3 shift? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-27-2012, 03:48 PM
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T-400 manual valve body 2-3 shift?

Here's to my trans guys.
Blown SBC, 3500 Pro Torque Converter, TH400, 9 inch rear.
Recently had a manual forward valve body installed. 1-2 shifts are firm; however, 2-3 not so good. I shift to 3rd and have to throttle down to get 3rd to engage? I checked the shifter cable-to linkage...all good. The valve body install required the modulator valve to be ground at the modulator end in two spots 180 degrees apart and the modulator reinstalled. I currently do not have a vacuum line running to the modulator. Lets hear what you think.
As it may come up, I went to a manual valve body because of the blower and a forward pattern because the shifter was currently in the vehicle. It is a street car.

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Old 07-28-2012, 09:05 AM
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I had basiclly the same setup. I ran a vacuum line and worked fine.
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Old 07-28-2012, 01:29 PM
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With no vacuum to the modulator , the main line pressure is higher.

History on this T-400 ?

Stock rebuild? Was the direct clutch drum setup for dual feed?

What brand of T-400 manual shift valve body was used... or what ''kit'' was used to convert the valve body?

The flat spots on modulator valve , sounds like the mod for no pressure cut back from governor pressure as road speed increases
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Old 07-28-2012, 02:50 PM
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It was in the car when I got it.
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Old 07-28-2012, 04:18 PM
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Quote:
Originally Posted by Mike67GTO View Post
It was in the car when I got it.
My questions are for Classick53 since this is his thread
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Old 07-28-2012, 04:30 PM
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Trans was built for the engine & rear end configuration. Unfortunately I do not know the details of the build. Hughes forward pattern full manual v-body.
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Old 07-28-2012, 10:41 PM
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The Hughes full manual forward valve body dual feeds the direct clutch drum through the separator plate. Not as good a method as having the trans built with dual feed internally.

Also i wonder how the trans was built internally on the direct clutch drum frictions. Some builders install a wave plate in the direct clutch drum, this will soften the 2-3 shift
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Old 07-29-2012, 06:42 AM
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It's not that my 2-3 shift is soft, it doesn't engage until I let off the pedal. It gets better...yesterday took the truck out a couple of miles and when I put it back into the garage...reverse doesn't fully engage until you throttle up. This trans probably has 150 miles on it.
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Old 07-29-2012, 09:36 AM
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Quote:
Originally Posted by CLASSICK53 View Post
It's not that my 2-3 shift is soft, it doesn't engage until I let off the pedal. It gets better...yesterday took the truck out a couple of miles and when I put it back into the garage...reverse doesn't fully engage until you throttle up. This trans probably has 150 miles on it.
The direct clutch operates in reverse and 3rd gear. Since you have a problem in both, I suspect a problem with pressure loss in the center support , sealing rings or the drum it's self
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