[Gmecm] 4L60e

[Garrett Herning]

Hi RC,

Yes, the solenoids are different. The EPC is pulsed at a different frequency 
(293.5Hz up to 94 and 614 in the 95 and later). It really doesnt affect the 
operation. Someone posted here that the lower frequency caused interferece 
on the AM radio band and thats why it was changed. The big difference is the 
lockup. Up to 1994 there was only a single lockup solenoid, 95 and later has 
2 solenoids, the normal lockup and a PWM lockup apply that can regulate the 
lockup pressure. If this second one isnt working (since your older PCM 
doesnt have the hardware to control it) you wont get lockup.  I'm not sure 
off the top of my head, but you may be able to swap in a 94 or earlier valve 
body into the later trans to get it to work... don't hold me to it though...

Garrett


>From: Rexdina at aol.com
>Reply-To: gmecm at diy-efi.org
>To: gmecm at diy-efi.org
>Subject: Re: [Gmecm] 4L60e
>Date: Tue, 5 Sep 2006 20:34:12 EDT
>
>Thanks for that info. I kind of thought it had something to do with the
>shift indicator, but I'm leery that the solenoids may be different.
>RC
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