Engine Type & Year: Please let me know if PCM does not match the engine exactly.  GM used different injector sizes, fuel rail types etc across engine's and years.  It's important for best performance to know exactly what the engine is.  Also, if you plan to swap intakes from another engine (LS1 intake on a 5.3L vortec) I NEED TO KNOW THIS.  Supplying an 8 digit injector number found on side of each injector will always help insure correct flow rate is programmed into the PCM.

Transmission Type & Year: On most applications, I can disable automatic trans controls if you wish to use a TH350, TH400, 700R4 ect.  Please read on below for info about the Vehicle Speed Sensor (VSS)  I do need to know if you will use a manual trans or not. 

Rear Axle Ratio: see info below for 'Tire Size or Height'

Tire Size or Height When using electronic transmission, this info is only needed if you need a calibrated speed sensor signal output to run a stock type speedometer.  I can program the PCM in most cases to output the proper speed signal to use the stock speedometer in 88+ GM Trucks, Jeeps, etc, about anything with electronic speedo from factory.  Most of the aftermarket speedometers are programmable, and the output from the PCM does not need to be exact.

Remove Emissions?  (this includes EGR, AIR Injection, EVAP System, Rear Oxygen Sensors on 1996+) You may choose to keep EGR but remove the rest.  Let me know and I can keep what you want.  Typically If you say remove emissions, I remove them all.  Keep in mind, I only disable the diagnostic test the PCM performs on these components. If you keep them hooked up, they will still function, with exception to EGR.  EGR operation changes ignition timing, so If I disable it, it will not function at all.)

Remove Computer Controlled A/C? (this is to delete the computer controlled a/c functions.  If you have aftermarket A/C unit, or using original A/C wiring from you're vehicle, you do not need the computer controlled A/C.  If you wish to use computer controlled A/C, all sensors, switches, etc from the vehicle the engine came out of will have to be used. Also, you do not need an A/C idle up, the engine will detect the load on the engine and adjust idle controller to maintain idle speed.)

Is this an Engine Swap, or original Engine/Vehicle. (some things I disable in the computer has to do with the PCM communication with other devices in the original vehicle.  If PCM is staying in original vehicle, its important I know this.)

Mass Air Flow Sensors  (MAF can be removed from most vehicles if required, however I recommend using it if at all possible to improve drivability)

Cooling Fan Controls (let me know if you have electric fans you wish to control by the PCM.  I can set the on/off points based on the thermostat you have in the engine.  Also, if you're vehicle did not have electric fans from the factory, I can usually turn on the function and provide the pin locations, wire and pins to wire up electric fans/relays.)

VSS - If using a non electronic trans, You should KEEP a vehicle speed sensor regardless of what transmission type you use.  The PCM needs to know if vehicle is moving.  Without the speed sensor, you can suffer from reduced fuel economy, reduced power, and idle problems.  There are a few options for speed sensors on the transmissions with cable drive output.  View this link at Dakota Digital website.  I have used Dakota Digital SEN-4160 with good success.  This is a 8000 pulse per mile sensor, that will allow cable speedometer hookup.  I can program most any PCM to accept any # of speed pulses. (1996, 1997 Black Box Vortec PCM will not accept 8000 pulse input)  Also check out www.jagsthatrun.com for other speed sensor options. (Must output a SINE wave signal, or A/C Voltage)

4x4 vehicles with manual transfer cases and ELECTRONIC TRANSMISSIONS must have speed sensor located between the transmission and the transfer case.  There are aftermarket companies that offer an adaptor that fits the sensor in this location.  Anytime you use an electronic transmissions, must keep 40 pulse per driveshaft revolution.  If you have a TH350, TH400, or manual transmission, then it really doesn't matter where the speed sensor is located or the # of pulses, just so PCM knows vehicle is moving, as stated above. Check Novak Conversions for information on adapting transfer cases to 4L60E and other transmissions. These adaptors include a speed sensor.  Keep in mind I need to know # of pulses and tire size/gear ratio when programming.