[Gmecm] 4L60e

[Dave Jones]

At least on the F- and B-bodies, '95 and up got the PWM version of the 
4L60E.  PCM code is different between PWM and non-PWM.
GM cast the letters "PWM" into the face of the front pump, if you need to 
verify what you have.
You can make a PWM valvebody function as a non-PWM by staking the TCC 
regulated apply valve in the full open position.  Alternatively, there's a 
TransGo valvebody reprogramming kit that will accomplish the same thing.
I'm not a tranny guy, nor have I stayed in a Holiday Inn Express lately, but 
I'm fairly certain that if you do either mod to the valvebody of your '96 
trans, so it function as a non-PWM, you  can bolt it in and be good to go, 
with no other wiring or programming changes needed.

HTH,
Dave



----- Original Message ----- 
From: "WopOnTour" <wopontour at hotmail.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, September 05, 2006 6:59 PM
Subject: Re: [Gmecm] 4L60e

> AFAIK that switch mounted on the shift shaft of the 4L60E (on the 95 or 
> newer models) is merely for the digital PRNDL readout on the cluster which 
> wouldn't be required on the older dash.However there may be other 
> electronic differences in the 96 model (e.g. solenoids?) that might not be 
> totally compatible with the 93 PCM . I don't have those details in front 
> of me, but some else here may know. Something about a different Pressure 
> Control Solenoid PWM frequency rings a bell???...
> HTH
> WopOnTour
>
> ----- Original Message ----- 
> From: <Rexdina at aol.com>
>
>> Hope I don't offend anyone, but I have a 4L60e question which  probably
>> affects the ECM. I have a '94 GMC Van 4L60e that needs rebuilt. I also 
>> have a good '96 4L60e out of a '96 Chev. pickup. Both are 2 wheel drive, 
>> full  sized vehicles. The '96 trans has a black box connected to the 
>> shift arm on the trans, while the '94 does not. What is the purpose of 
>> the '96 black box and it's wiring? Can it be discarded and can the '96 
>> trans. be a bolt in replacement for the '94? Thanks in advance.
>>  RC