i found some 28" x 12" hoosier slicks for my truck.

just wondering if i will run out of gear? should i look for a 30"

Thanks.

 

30s might be better. what are you crossing the traps at now?

 

Not sure. I have not been yet

 

if your shifting at 6000 rpm's, it would be approx 1-2@36, 2-3@67, and 3-4@110 with the 28 inch tire and 4.56's.

with a 30 inch tire your looking at approx 1-2@39, 2-3@72, and 3-4@117.

i got my info from f-body.org/gears using ratios of the 4l60e at 3.06, 1.63, 1.0, .67

 

I have a 4l80e if that makes any difference?

So from 28-30 is only 7mph...

 

Its still going to be the same, 3rd is 1:1.

Whats done to your truck?

What converter? Locking the converter wide open or no?

What rpm do you spin it to?

 

6800rpm would be around 120 with 28s. You'll need quite a bit of power to get the truck to trap over 120. So Im sure you'll be fine.

 

If I remember right...........I was running a 4.56 with a Goodyear Slick that was stamped 29x10 (actually measures closer to 28"). I went through the traps at 6800 with the converter locked in 3rd gear at 126 mph.

With that same tire but with 4.10's, threw the traps at 126 mph, motor was at 6600 rpm with the converter unlocked.

Just giving you some things to reference.

 

ok ill pass on this set i found and try to find some 30s

 

can you post a link of those tires. Thanks