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clinebarger · 01-26-2014, 07:28 PM

The EPC (Electronic Pressure Control Solenoid) In a '91-'93 4L80E is NOT compatible with LS electronics. A '94-'03 EPC part# 24209276 is the one you need, Bolt-in deal.

The original '91-'93 internal harness is NOT compatible either, Again a '94-'03 harness will work, Part# 24200161.
A lot of the early 4L80E's have already been updated with a harness. But check to be sure. The early harness has a threaded hole in the middle of the connector, The late harness does not.

01-26-2014, 07:28 PM	#12
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: LQ9 with early 4L80e The EPC (Electronic Pressure Control Solenoid) In a '91-'93 4L80E is NOT compatible with LS electronics. A '94-'03 EPC part# 24209276 is the one you need, Bolt-in deal. The original '91-'93 internal harness is NOT compatible either, Again a '94-'03 harness will work, Part# 24200161. A lot of the early 4L80E's have already been updated with a harness. But check to be sure. The early harness has a threaded hole in the middle of the connector, The late harness does not.