[Gmecm] 4L80e/4L60e

[Garrett Herning]

Hi Will & Harry,

Will is right, you could get a 4L80E to run with some wiring and a relay. 
Where I work we make test tools that are used to shift trans in cars or on 
dyno's without the factory ECM. Since you have a 94, there is only 1 lockup 
solenoid for your 4L60E, same as the 4L80E (the 95 and up 4L60E had a lokup 
and a lockup feel solenoid) Shift Solenoid A is the same locgic, Shift 
solenoid B is inverted, Lockup and EPC are the same, and you wouldn't have a 
3-2 downshift solenoid on the 4L80E. I'm not sure if leaving that wire 
unconnected would throw codes or not. Looks like the pressure switch logic 
is the same as well but I'd have to double check that against a GM manual. 
You'd have to make an adapter harness to reconfigure the wires from the 
4L60E harness to a 4L80E. I'd be happy to help you with that as I have the 
harness wiring diagrams if you want to go that far.

Garrett


>From: William Lucke <william.lucke at highspeedlink.net>
>Reply-To: gmecm at diy-efi.org
>To: gmecm at diy-efi.org
>Subject: RE: [Gmecm] 4L80e/4L60e
>Date: Sun, 25 Jun 2006 19:48:43 -0400
>
>You can run a 4L80E with a 4L60E PCM. The truth table for the solenoids is 
>different, but all you need to do is put an inverter on one of the solenoid 
>wires, I think.
>
>
>
>Will
>
>
>
>>From: Rexdina at aol.com
>>Subject: [Gmecm] 4L80e/4L60e
>>
>>Does anyone know for sure if the 4L80e wiring receptacle and plug  would 
>>interchange with that for a 4L60e?
>>  I have a '94 GMC van that I'd like to change from the factory 4L60e  
>>trans. to a '94 4L80e GMC van trans. for towing purposes.   If that isn't 
>>possible, what about a stand alone controller for the  4L80e, and how 
>>would I disable the inputs from the 4L60e to the ECM?
>>   Thanks, and I realize this may be the wrong forum to ask these  
>>questions. In that case, does anyone know of a good GM transmission forum?
>>Harry
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