TH400 shift point adjustment?? - Team Camaro Tech
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  #1  
Old Jun 16th, 10, 07:13 AM
g356gear g356gear is offline
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Default TH400 shift point adjustment??

Under power my Th400 is shifting way too early. I have to manually shift to keep from shifting around 3000 rpm. What is the best way to adjust shift points on one of these units? Thanks.
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  #2  
Old Jun 16th, 10, 08:52 AM
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HwyStarJoe HwyStarJoe is offline
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Default Re: TH400 shift point adjustment??

Adjustable vacuum modulator.
You may already have one installed. Pop the vacuum hose off and look inside the tube. If there is what looks like a slotted head inside, it's adjustable.
I don't know which way is "sooner" and which way is "later". Do a search here and I'm sure it's explained.

Take a look at this: http://www.camaros.net/forums/showthread.php?t=170178
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  #3  
Old Jun 16th, 10, 07:43 PM
hereitis67 hereitis67 is offline
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Default Re: TH400 shift point adjustment??

get a adjustible mod and screw it in to raise shift points
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  #4  
Old Jun 17th, 10, 08:39 AM
jakeshoe jakeshoe is offline
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Default Re: TH400 shift point adjustment??

How is a vacuum modulator going to raise shift points "under power"?

It's for part throttle operation, not WOT or near WOT. I would hope our resident transmission "builder" would know that.

Is the kickdown hooked up? 12V getting to the connector on the drivers side above the pan rail at WOT?
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Old Jun 17th, 10, 01:27 PM
ToocoolZ28 ToocoolZ28 is offline
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Default Re: TH400 shift point adjustment??

Does a turbo 400 have a governor like a 700r4? If so I would say the govenor weights need changed. I am NOT a trans expert but I did this on my 700r4 and got it to shift at 5500rpm at wot.
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Last edited by ToocoolZ28; Jun 17th, 10 at 04:45 PM.
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  #6  
Old Jun 17th, 10, 03:06 PM
muzzy muzzy is offline
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Default Re: TH400 shift point adjustment??

Yes altering the governor springs and weights is the only way to get a large change in the shift points.
Summit sell a kit with a selection of weights and springs,it takes a bit of trial and error to get the shift points where you want them.
I have my turbo 400 shifting at 6000rpm wot
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