engine vacuum or direct into the intake.
same as engine vacuum.
Th350 has a modulator on the back. Th400 has modulator on side. 700R4 has no modulator.
The Vacuum Modulator is located on the right side on the transmission just above the pan and below the two cooling lines. It should be brass colored with a 1/4" or 3/8" vacuum hose attached to it.
More Info, If You Do Not Find A Modulator, You Could Have a Different Trans. If You Have A Square Pan With 16 Bolts Then You Have A 4L60 or TH700( no modulator on these) If the pan is oval and 17 Bolts Has 4L80 ( no modulator on these) Hope This Helps You Should Have A TH400 Trans & It Does Have A Modulator.
A 350 has a vacuum modulator back at the tailshaft on the passenger side. Also the pan's shape is different.
4L60E, (the electric decendant of the 700R4 and TH400)
they are not maintenance adjustable on the th400
no
There are 4 different options for the type of transmission that came in a 1988 K5 Blazer. They are the 4 speed SM465 manual, the 3 speed TH350 automatic, the 3 speed TH400 automatic and the 4 speed 700R4 automatic.
as long as it is a chevy bolt pattern th400
The th400 is a much stronger transmission meant for heavy duty use while the th350 is meant for normal use.
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