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Discussion Starter #1
My th400 shifts just fine cruising around town or in the pits. it is not a full manual valve body. It hold gears and shifts fine until u floor it, and it never shifts into second until u let up off the throttle a little bit. the 2-3 shift is just fine. help.
 

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Discussion Starter #3
The same if i put it in drive and mash it, it wont shift to second either. it will at 3/4 throttle or if i let off the accelerator a little bit.
 

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I broke it doing a burnout in 1st - 2nd instead of 2nd - 3rd. After it broke I could start off in any gear but it wouldn't shift under pressure.
 

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Discussion Starter #6
with a broken sprag, will the trans still shift under light throttle? The trans isnt making any noise, fluid looks good, and like i said before the trans works perfectly until full throttle.
 

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Discussion Starter #7
This might sound funny, but i found out today that i have 4 rocker arms that are loose, due to tired lifters. Maybe its just not getting enough vacuum at higher rpm?
 
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