Re: dumb & dumber

[Shannen Durphey <shannen@grolen.com>]

4L80E has 2 solenoids (a + b) :) to control gear selection, a
combination of switches to let the pcm know what gear is selected, and
2 solenoids to engage the tcc(IIRC).  The transmission defaults to
second gear operation, with both solenoids off.  To put the trans
through gears 1-4, the a + b solenoids are powered on and off in
different combinations.  The only mechanical valve body holdovers that
I can think of are a couple of accumulators to cushion the shifts.  If
enough people are curious, I'll dig out my trans books in the next
couple of days.
Shannen

Swayze wrote:
> 
> even with schooling, I know the feeling.
> I  checked on junkyard 'diesel' trans controller....somewhere around $75.
> I still don't have the foggiest idea what ,on a trans., it actually controls
> besides TCC.
> It would be nice to see a complete input/output diagram for one.
> 
> as for ECM's the 730/727 app I am intersted in (350-V8) is pretty well
> hacked so that it is really becoming more a matter of 'tuning' rather than
> figuring out stuff (.bin.ecu..etc.)
> 
> and I thought GTO stood for gas,tires and oil
> 
> byE
> Mike
> Swayze
> mswayze@truswood.com
> kswayze@bellsouth.net
> ----- Original Message -----
> From: "gene l. clifford" <genelc@idworld.net>
> To: <gmecm@diy-efi.org>
> Sent: Tuesday, March 14, 2000 11:31 AM
> Subject: dumb & dumber
> 
> > > Has any one been able to get a Price on GM part# 12497316
> > > > This is a stand alone Trans controller for a 4L60E automatic
> > > > any other info on above part would be welcome?
> > > >                                                 GLC
> > > > PS part is listed on pg. # 170 of yr. 2000 GM performance Cat.
> > > >
> > My original post (see above)
> > has resulted in appx. 26 response's!
> > thanks to all!
> > however the question I was most interested in finding an answer to remains
> a
> > mystery??
> >
> > <<Has any one been able to get a Price on GM part# 12497316>>???
> >
> > I have called several GM dealers and get no answer
> > I was already aware of  2  stand alone controllers, but  I agree with
> grumpy
> > they are a poor choice from an economic standpoint (read rip off)!!
> > as for the purpose of this question I have Three small blk engines and
> quit
> > a bit of Hi perf. gear
> > my knowledge of FI stuff is limited to simple repairs of existing stock
> > components IE;
> > temp sensors, 02 sensors, that sort of thing
> > I agree with everyone that the day of the carb is waning, but at this
> point
> > I not sure I can master what seems to be a quite complex tech skill
> > I subscribed to the list  with the hope that I would be able to gain the
> > knowledge to do my own work on the electronics in late model performance
> > cars!
> > I feel like I have entered a class for "Quantum physics" when I should be
> in
> > Physics 101!!
> > did every one on the list start out blessed with complete knowledge of
> > computor science as related to cars? Or am I just dumb??
> > Is there no literature out there for the  beginner??
> >
> > "There are no speed secrets! Just good engineering"
> >                                                       Gene L. Clifford
> >
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> 
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