[Gmecm] Geting rid of electronic transmission.

[Doug Chase]

Along these lines, can anybody point me to the details about modifying the
700R4 so that it's always in lockup in 4th gear?

The vehicle in question is a '90 Astro with a 4.3l V6.  When I'm towing I
pay close attention and make sure to stay out of 4th gear non-lockup, but
I'd like to not have have to do this.

The original transmission only lasted 180k miles and I'd like the second one
to last a little longer.  ;-)

Thank you,

Doug Chase
www.chaserace.com
425-269-5636

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of davesnothereman at netscape.net
Sent: Wednesday, March 01, 2006 8:21 PM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] Geting rid of electronic transmission.

For perspective, the 700R4 has taken somewhere around 15 years for the
combination of GM and the aftermarket to fix.  GM's answer is really about
the best, remove the valve body and replace it with solenoids.  
Although there are some good fixes for the mechanical version in the
aftermarket.  But I agree that there are too many failures in the
700R4/4L60E trans family.  The E series failures seem to be most common in
V6 powered trucks, especially S series vehicles.  Prolly a combination of
vehicle weight, insuficient cooling, and excessive shifting and converter
locking/ unlocking.  It was no surprise when a friend asked me in December
if he could replace his 4L60E with a 700R4, just to keep the beater running.
What better opportunity to find out if it will work?  The ecm performed with
no problems... didn't even light the check engine light (to my surprise).
We rewired the TCC through the brake switch and the 4th gear switch in the
trans so he'd get lockup and converter cooling in 4th, and all was well.
For about a month... then the 700R4 died.  And last month, his next beater,
an Olds Bravada with 4L60E, puked a trans also. lol!

So go ahead and make the swap.  Don't forget to make sure the TV cable is
connected and adjusted properly.  I've seen 700R4's die in less than a week
due to misadjustment.

Zaphod
-----Original Message-----
From: JD <jdeeze at mhtc.net>
To: gmecm at diy-efi.org
Sent: Tue, 28 Feb 2006 09:21:57 -0600
Subject: [Gmecm] Geting rid of electronic transmission.

   The experts on this list are usually way over my head, so who better to
ask?
 I just bought a 94 K1500 Chevy pickup with a blown 4l60E transmission.
  I have a high performance/towing 700R4 4x4 trans with only a couple miles
on it.
  Question is will this screw up the computer if I don't connect the
transmission wiring.
 I planned to change to the TV cable and correct TBI from a 92.
  The trans is setup with TCC to automatically engage in OD unless I
manually shut it off.
 The ecm is 16196395 BJLH.
  I need to know if the 4 inputs wires on the trans affect the engines
outputs or are they strictly for  transmission control.
 They are:
 B4 5v ground
 F1 trans mode A
 E5 " " B
 E4 " " C
  The 700R4 Cost over $1600 to have built and I don't like the record of the
4L60E's anyway.
 Think it will work?
 JD

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