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TH400 why does it do it?

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Old 11-06-2012, 09:14 PM
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Question TH400 why does it do it?

Ok got it rebuilt and told them to put .500 boost valve,stage 1 shift kit hd clutchs now it will not let the rpms go up the way it did be4 and when it shifts it is as smooth as a baby's bottom! with the shift kit i got told i would feel it! and when it shifts 2 to 3 it only let it go to 3200 rpms what do i need to check?
Old 11-06-2012, 10:16 PM
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wtf....never heard of that.
Old 11-07-2012, 08:36 AM
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Originally Posted by peterzacharias1991
Ok got it rebuilt and told them to put .500 boost valve,stage 1 shift kit hd clutchs now it will not let the rpms go up the way it did be4 and when it shifts it is as smooth as a baby's bottom! with the shift kit i got told i would feel it! and when it shifts 2 to 3 it only let it go to 3200 rpms what do i need to check?
Sounds like it needs a governor recalibration kit. I had to do this to my 5.3/th400 swapped k5 took several trys but I finaly got it to my liking.
Old 11-07-2012, 08:39 AM
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if you put the transgo spring in the govenor it will only shift when you manually shift it..

on the actual soft shifts, what size stall you running?
Old 11-07-2012, 09:45 AM
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What size are the 2nd and 3rd gear feed holes drilled to?
Old 11-07-2012, 06:01 PM
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Originally Posted by 1969x11
Sounds like it needs a governor recalibration kit. I had to do this to my 5.3/th400 swapped k5 took several trys but I finaly got it to my liking.
well the shop that rebuilt it says it is my VACUUM MODULATOR hose but it looks good and get 12-26in so he said that was good!

Originally Posted by nonnieselman
if you put the transgo spring in the govenor it will only shift when you manually shift it..

on the actual soft shifts, what size stall you running?
If i manually shift it it will lets it go till i shift but not as hard as i would like it to!
The stall is a 2600-2800 RPM B&M

Originally Posted by slow67
What size are the 2nd and 3rd gear feed holes drilled to?
I would not know that but something i need to ask him about & THANK YOU ALL FOR PUTTING YOUR TIME INTO HELPING ME OUT!
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