I have a 97 3/4 ton with the 5.7 vortec and 4.10 gears, does anyone know if there is anything to tune in the trans or engine for anymore power or mileage? it runs good i just ended up with some extra credits and figured i would tune my truck if it would be worth it. TIA
Hugh
Best bet is a 411 pcm swap. Pm me for lextech email he has spreadsheets. He also sells new connectors and a pcm with the correct tune file already written.
Little confused here the thread title states 99 classic. Your post says 97. If it's a 99 classic it's supported. If it's 97 obs it's not supported. I believe only the 98+ pcm's are supported.
Last edited by Oleblu; 11-22-2018 at 03:30 PM.
97 ext cab short bed silverado 5.7 411 swap, edelbrock 29135 intake, lightly ported 906 heads milled .035 thou. factory press in rocker studs & rockers, comp 787 retainers & stock locks, ls6 springs. Comp cams 08-503-8 T56 swap
86 SWB crate vortec 5.7/th350 The wife's truck
Sorry i messed up, it is a 99.Originally Posted by Oleblu
Hugh
You can tune it if its a 99. There isn't as much that you can change in the black box but you can make the truck run better yes. PE settings suck from the factory, you can dial in your airflow tables, throw more spark at it, and delete TM because your 5.7 won't hurt a 4l80e. You can also increase shift speed and raise shift pressures, and change shift points.
2000 K2500 - 489 CI Vortec w/ comp XE270 cam - 0411 swap and rear mount turbo
1972 M35a2
2011 LML Duramax
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