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Old 02-08-2013, 11:17 AM
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Vacuum hookup on T-400 transmission?

I was wondering if some had a picture of where to hook up the the vacuum modulator to the manifold? I replaced the transmission in my 89 suburban with an th 400 and need to hook up the vacuum modulator but not sure where is the best place to hook it up at. a picture would be nice.
thank you for your time

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Old 02-08-2013, 11:58 AM
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wires

also I took out a 700 and it had a three wire plug on the side that the kick down is on the 400 . should I remove those wires or would it be ok to leave them? if should remove them would you know where they are hooked up at.. i tried to follow them but it is a jumbled mess!
thanks
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Old 02-08-2013, 01:37 PM
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Originally Posted by Juleshulings View Post
I was wondering if some had a picture of where to hook up the the vacuum modulator to the manifold? I replaced the transmission in my 89 suburban with an th 400 and need to hook up the vacuum modulator but not sure where is the best place to hook it up at. a picture would be nice.
thank you for your time
The modulator has to be hooked to a full time vacuum source (called manifold vacuum). On a stock TBI, the correct port should be on the back side between the fuel lines (see below). If you have a carb, the port will usually be in the baseplate but check to be sure, especially if you have a Q-jet.

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Old 02-08-2013, 05:36 PM
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thanks:)

thank you very much!! I got her up and running!!the only thing is I have put the recomended amount of tranny fluid in and it is not showing up on the dip stick? should I add more?
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Old 02-08-2013, 09:59 PM
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Originally Posted by Juleshulings View Post
thank you very much!! I got her up and running!!the only thing is I have put the recomended amount of tranny fluid in and it is not showing up on the dip stick? should I add more?
As long as the dipstick is correct for the tranny and tube, add until it's at the bottom of the cold level. Check again after the tranny is hot and add if needed.

Check with the engine running. Shift through all the gears then back to park. Wipe the dipstick and check the level- engine running still.
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