</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans"><strong>I'm pretty sure all 4L30E transmissions have .72 overdrive. 5.38 gears + 33's = 2960 rpm's @ 75mph vs 4.55 + 33's = 2500rpm @ 75mph, by my calculations.

My Trooper can cruise all day easy at 3000 rpm.</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Thats encouraging news. In my calculating last night i had down .89 for the ratio, which was giving me 3656 rpm at 75mph <img border="0" title="" alt="[Eek!]" src="images/icons/shocked.gif" /> . Given that the speed limit is only 70 mph <img border="0" title="" alt="[Razz]" src="images/icons/tongue.gif" /> , 2950 rpm at 75 is not bad at all. My '88 runs 3000 at 70, stock.

Adam