https://www.gmforum.com/1992-1999-91...estion-212594/

i think you are limited in mods being series one

The 65 is rated for 6500lbs. The added HD means it has heavier duty parts inside. Is that even a word? Heavier duty? Anyhoo, Justin'* right and I missed it early on in the post. Your 93 has the Series 1 engine. Your very limited on upgrade mods. That includes programming. Only 1 or 2 companies program those types of PCM'*.

Im not too disappointed, it'* pretty fun as is!!

Like I've said at the race track, run her till she blows!

then after that, you might consider picking up a series 2 l67 with trans/pcm/harness and updating yours. then you have an infinite world of upgrades and tuning available.