TH-400 help

[Marc Piccioni]

I can answer 3 of your questions, see below

----------
From: 	Jennifer and Brock Fraser[SMTP:fraser at forbin.com]
Sent: 	February 23, 1999 5:27 PM
To: 	diy_efi at esl.eng.ohio-state.edu
Subject: 	TH-400 help

Possibly someone can help me with a TH-400 application.  I haven't ever had
any dealings with these units, so I have a few questions...

1.  The trans has a wire labeled "kickdown switch".  What does this do, and
do you ground it or supply +12 to activate it? (I assume +12v, since there
are no other wires and grounding could be through the case)

This applies +12 volts to the kickdown solenoid inside the transmission 
valve body and forces a "kickdown" shift  to the next lowest gear. The 
switch to activate it should be set up to close at 90% of WOT.

2.  Does anyone see any problems with deleting the speedo sensor, since the
speedometer on my car takes its reading from the differential, and I'll be
using a manual transmission calibration with the PCM... (96 LT1)  I think
the only thing that a manual cal uses the speedo for is idle speed, and I
can do without that.  Error codes aren't a concern...

3.  There's a modulator on the side of the case.  What does a modulator do
when it sees boost pressure?  Should I use a check valve to block boost 
from
going to it?

If you are going positive pressure YES. The modulator regulates the line 
pressure to control the shift firmness and to a degree shift points.

4.  How do you adjust the wide open throttle shift points?  I realize that
the trans must be disassembled.

WOT shift points are controlled by a combination of govenor weight/springs 
and 1-2, 2-3 valve body spring.

Suggest you get a book "How to rebuild and modify your Turbo 400", 
excellent book. If you have never rebuild a automatic before you may wish 
to get help. There are a lot of places to "miss".

I've rebuilt a number of Turbo 350's and 1 400, you will need a number of 
special tools to handle the job.

/Marc

/Marc

Thanks a lot,
Brock




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