Quote:
the 32" tall tire makes the difference. I run a 27" tall tire (275/50-17) & with the 4.56s it does about 2200 rpm @ 70mph. The 3.73s did 1600 rpm @ 70mph - way too low.Originally Posted by TurboGibbs
I haven't done any "real" launches but with my 275/55-20's that are 32" tall and occasional towing, my 5.13's are perfect. 1900 rpm @70mph. I do have 29" slicks for the track.
TECH Senior Member
Quote:
I had 3.73's when I first did the T56 swap. It was around 1200 rpm and 6th was almost worthless. I went to 4.30's and then settled on 5.13'sOriginally Posted by SixSpeedSS
the 32" tall tire makes the difference. I run a 27" tall tire (275/50-17) & with the 4.56s it does about 2200 rpm @ 70mph. The 3.73s did 1600 rpm @ 70mph - way too low.
4.88's would have been ok if I didn't tow on occasions or if I had a big block like yours of course.
Import Moderator
Hey Tod, Welcome to PT! Great group of knowledgeful (not even a word, i know lol) guys on here... glad youll be able to contribute to it 
Quote:
4.88's would have been ok if I didn't tow on occasions or if I had a big block like yours of course.
Originally Posted by TurboGibbs
I had 3.73's when I first did the T56 swap. It was around 1200 rpm and 6th was almost worthless. I went to 4.30's and then settled on 5.13's4.88's would have been ok if I didn't tow on occasions or if I had a big block like yours of course.
The big block helps. I wish I could get 4.30s for the 9.5" rear. They'd be perfect.
