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Message: [QUOTE="cleatus12r, post: 1317170, member: 18093"] Here is one of the biggest problems we will face here. Your 1997 CANNOT use a 99.5-01 PCM unless you want to rewire things and change some transmission hard parts. Because some people who know nothing about tuning always offer advice leaning toward EVERYTHING using "pmt base". Uh. No. For the 1997 though, if it's an automatic, VCAB0_02 (TDE1) is the most popular because of the OBD2 compliance. Any DPC-202 PCM can run VCAB0_02 programming though so the actual PCM itself doesn't matter. If it's a manual, the same can be said about VDAB0_02 (MLE1) and a DPC-203 PCM. As for the question about an NVKx or PMTx PCM, it doesn't matter. Either will be fine because the base calibration you'll likely use for your tuning and chip will be VRAA6S3 (PMT1) anyway. Although, in the grand scheme of it all, doing enough digging around will produce similar results from any of the PCMs. It's why I use an XLE4 in my 2000 pickup with 250/200% injectors and an AWA3 PCM in my 2001 F550 service truck at work. Minimum of what you'll need (this is a list for everyone) to make it short, sweet, and easy: 1. Minotaur 2. Definition file for whatever you're tuning and for file size (224K for TS or 256 for Hydra). 3. Hydra (no burner) and Hydrabuilder and Hydraflash software OR TS chip/burner setup. 4. METRIC TONS OF MAN HOURS TO FIGURE OUT WHAT YOU'RE ACTUALLY DOING WITH THE TUNING. Here's a list of definitions and base calibrations that are common among *cough* "professionals" *cough*: 1995-1997 Automatic uses VCAB0_02 (TDE1)calibration and definition. 1995-1997 Manual uses VDAB0_02 (MLE1)calibration and definition. 1997 Auto with AB injectors uses VEAB20B (MME7) calibration and VEAB20 definition. Early 1999 49-state Auto uses VHAE9J2 (XLE4) calibration and VHAE9 definition. Early 1999 50-state Auto uses VHAE9E2 (VCQ4) calibration and same definition. Early 1999 49-state Manual uses VIAF3G4 (AWA4) or VIAF3G7 (AWA5) and VIAF3 definition. Early 1999 50-state Manual uses VIAF3E4 (ZDR4) or E7 (ZDR5) and VIAF3 definition. 1999.5-01 49-state Auto uses VRAA6S3 (PMT1) and VRAA6 definition. 1999.5-01 50-state Auto uses VRAA6N3 (NMC1) and VRAA6 definition. 1999.5-01 49-state Manual uses VOAA7P6 (DAC3) and VOAA7 definition. 199.5-01 50-state Manual uses VOAA7G5 (ATA3) and VOAA7 definition. 2002-2003 49-State Auto uses TNAA4S2 (VDH2) and TNAA4 definition. Some use TNAA5S8 (VDH4) or TNAA7S3 (VDH5) in which case you'd need a TNAA5 definition. 2002-2003 49-state Manual uses TOAA4Z2 (AEB2) or TOAA5Z5 (AEB3) and will use a TOAA4 or TOAA5 definition respectively. The 50-state 2002-2003 Autos use TNAA4N2 (QLJ2) and TNAA4 definition but some use TNAA5N7 (QLJ4) and a TNAA5 definition. The 50-state 2002-2003 manuals use TOAA4M2 (ZRE2) and TOAA4 definition. [/QUOTE]