2001 Seville STS
I have an 05 STS 4.6 Rwd. I saw that later years of the sts have a 6 speed. I was curious if I swap the tcm over and shifter, if I could slap a 6 speed trans in my car? Now I looked at tcm and shifter images on ebay, the connections look about identical from what I can tell. I was wondering if I'm the only one thats had this thought. I know there will be a lot of nay sayers, "why do you need it, it doesn't help much" blah blah blah. I want the 6th gear to have a lower rpm while doing 80-85mph with traffic these days, maybe get that extra 1 mpg its rated to provide, boost from 18 to 19 or 19 to 20. And maybe it would help more in that 70-75mph mark. Anything helps, most of the time I'm lucky to hit 300 miles per tank, thats just not enough, makes for short road trips. My trans isn't the silkiest smooth thing anymore, just curious before I swapped it out if I could do a worth while swap, bring it into the future a couple years.