[Gmecm] Geting rid of electronic transmission.

[Programmer]

I'll throw in some limited info...towing in OD or driving with the torque 
converter 'unlocked' builds the heat. It's not the 'strain on the gears' or 
anything like that. It's fluid shear in the torque converter (kinda like 
driving your truck in 'stall' mode all the time) that builds heat.  The next 
problem is most people think the cable is a 'kick-down' cable when it's a 
throttle pressure cable. If that cable is incorrectly set, you can lunch a 
700R4 in short order.

The factory trans cooler is also not much for really being a 'cooler'...a 
self regulating cooler is the best.

Lyndon.

----- Original Message ----- 
From: "Jason M." <galaxiecustom500 at sbcglobal.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, March 02, 2006 7:58 AM
Subject: Re: [Gmecm] Geting rid of electronic transmission.


> www.700r4.com is a pretty decent source of information, they also have the 
> parts.
>
> When I converted my 82 caprice to a 700r4 I used a brake switch and a 
> manual switch on the dash for lock up.  Works really nice.  This car 
> originally was a diesel with a 2004r, and still has a switch on the 
> throttle pedal for the TCC.  Still haven't hooked it up to see if it 
> works, or how it works.
>
> Usually I'll let the car warm up to temperature before activating the TCC. 
> Due to valving the TCC cannot lock in 1st, and seems to be over 20 in 2nd 
> the TCC locks, then anytime in 3rd or 4th.  I sort of like it for driving 
> around in town, can be driving 25mph in 3rd with the tcc locked turning 
> 800 rpm, or 35mph in 4th turning 900 rpm.
>
> My set up doesn't use a relay, although most schematics/kits use one.  No 
> problems in over a year.
>
> This summer I'll be swapping to a 305 chevy and another 700r4, will 
> probably redo the TCC control to be a little more automatic.  Would at 
> least want a throttle switch of some kind.  The current engine is an Olds 
> 350 that really likes being "lugged down"  The 305 as planned, doubt it.
>
> Jason.
>
>
> ----- Original Message ----- 
> From: <davesnothereman at netscape.net>
>> For tcc control without an ECM you need to obtain a 4th gear switch if 
>> your trans doesn't have one.  It's originally used to tell the ecm that 
>> the trans is in 4th by making a connection to ground.  This switch should 
>> be connected to the control side of a relay, which in turn connects 
>> either power or ground to the TCC.  For additional convenience a factory 
>> brake switch can be connected in series in the relay control circuit to 
>> unlock tcc when the brake is depressed.  And to make TCC operation 
>> smoother and less intrusive there are vacuum switches and various other 
>> switches which can be used as well.  I believe some google searches will 
>> come up with nice diagrams and pictures of different ways to do this. 
>> The 700R4 retrofit is fairly popular, and most of 'em end up going with 
>> TCC lockup, either because they heed warnings, or because they learn by 
>> experience.
>>
>> Good luck.
>> Zaphod
>>
>
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