[Diy_efi] Using GM '747 to control TCC lockup only

[Steve Ravet]

> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org 
> [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Logan Lingle
> Sent: Tuesday, September 12, 2006 6:09 PM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] Using GM '747 to control TCC lockup only
> 
> David M. Ingebretsen wrote:
> > My dilemma is that I have a 700R4 automatic in the thing 
> and like that 
> > the GM ECU ('747) controls the TCC lockup. I will lose that 
> feature in 
> > the Mopar unit.
> >
> > Any ideas about the feasibility of using the '747 to just 
> control the 
> > TCC lockup?
> >   
> Hi David..   I own a transmission shop and deal with the 700R4/4L60 
> lockup issue constantly.

[description of using 4th gear switch to control TCC deleted]

Everyone has their preferences for how they want things to work...  My
transmission shop hooked up TCC this way (bypassing the computer
control!) and it was terrible.  Maybe if you have them change the shift
points also it would be better.  While driving through the neighborhood
I would find myself in 4th gear at 900-1000 rpm, around 20 mph or so.
Talk about shuddering and shaking.  The TCC should be unlocked in these
conditions allowing more engine torque but wiring the switch directly
removed the computer from control.  I took it back the next day and had
them put it back to stock.

--steve



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