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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> T-400 has delayed shift
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Topic Review (Newest First)
10-04-2011 09:15 PM
66GMC One common problem for a delayed shift is the vacuum line / hose that runs from the intake manifold to the vacuum modulator, unhooked or leaking vacuum.

If there is ATF present inside the line itself, the diaphragm is likely damaged, and will require replacement of the modulator.

This is, of course the "best-case scenario".
Good Luck.
10-04-2011 08:29 PM
Crosley cheese burger,

welcome to

I merged your multiple posts into one thread for the members to see your questions in one thread
10-04-2011 08:23 PM
cheese burger delay shifting to 2nd and have to shift manually. just install and 2800 stall and not driven yet. because engine lost fire from distirubor
10-04-2011 08:01 PM
cheese burger
th400 has delayed shift

th400 has delayed shift before i installed 2800 stall. i. have not driven the truck yet. because lost fire from distribuor and i can get the spark back.
10-01-2011 10:58 PM
anglia427 the transmission gurus could use a little more backround info on this one
10-01-2011 09:02 PM
cheese burger
T-400 has delayed shift

delayed shift to second

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