91-93 TBI Trucks with 4L80E transmission 16147060


This is one of the first electronically-shifted transmission applications.  Some 1991-93 vehicles came equipped with 4L80E transmissions and 16147060 PCMs.  This is a P4 generation ECM which speaks ALDL at 8192 baud and have removable “memcals.”  This was a one-year PCM which was followed by the 16168625 / 16197427 in later years.

Hardware for Tuning

  • G1 Chip adapter and C2 27SF512 chip required to reprogram ECM
  • BURN2 Chip Programmer programs 27SF512 chips
  • ALDU1 with CABL1 required for datalogging
  • Ostrich2 required for real time tuning
  • APU1 AutoPROM All-in-one device works great, taking the place of BURN2, ALDU1+CABL1 and Ostrich2

Software for Tuning

These computers can be kind of tricky.  the $85 mask was the original but it was replaced with $D8.  You’ll need to read the memcal using a HDR1 to determine exactly which mask you have OR download a known starter bin to use from gearhead-efi or other sources.  Be warned: software support for this setup is not anywhere near as complete as the later $0D/$OE masks which followed.

$85 information page on gearhead-efi

$D8 information page on gearhead-efi

TunerPro RT + definitions from gearhead-efi works for editing and datalogging.  (this is the recommended software.  It is included with the AutoProm)

TunerCat OBD1 tuner with the appropriate definition works for editing.

Recommended Hardware to Buy

  1. G1 + BURN2 + C2 = most basic
  2. G1 + BURN2 + C2 + ALDU1 w/ CABL1 = basic with logging capabilities
  3. G1 + APU1 = Chip tune / realtime tune / datalog – full capabilities
  4. G1 + APU1 + wideband = full capabilites with wideband logging