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TH400 shift point adjustment??

23K views 5 replies 6 participants last post by  muzzy 
#1 ·
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.
 
#2 ·
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
 
#6 ·
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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