does 143.6 MPH seem doable.

I topped out in 3rd yesterday at 6000 RPM's, calculator shows 143. I burnt a 1/4 tank in 5 minutes, I was getting 3.8 MPG. It was kinda of scary. Any thoughts?

 

ive been up to 130 on hptuners and it was still pulling i think u could do it

 

i got up somewhere around 137 on the dyno the other day and they told me to shut it down there. it was still getting on up there

 

I got 138 before at the top of 3rd. What size are your tires?

 

I have been 152.xx when I had the radix/h/c combo on the 4.8 that was with 29.8 inch tall tires and 3:73 gears. I will never do that again

 

I have 33's.

Stock Tire: 295/70R17
Section Width: 11.61 in 295 mm
Rim Diameter: 17 in 431.8 mm
Overall Diameter: 33.25 in 844.55 mm
Sidewall Height: 8.12 in 206.24 mm
Radius: 16.62 in 422.14 mm
Circumference: 104.4 in 2651.7 mm
Revs per Mile: 625.5


It pulled hard and pretty quick from 5100-6000.

 

It was smooth, but I felt some vibrations from the drive shaft that gave me an uneasy feeling. I love the shocks on the VMAX, turn the dampening on and poof it rides awesome at 100+ MPH.

 

good for you erick! i cant put my truck over 100 before it feels like it is going to come flying apart. lol hey see ya soon by the way (april). how did you get that MPH?

 

i got clocked doing 140 and accelerating (so said the trooper in m driveway when i got home) so id say that is VERY doable in a lsx based truck.

 

Did the old rpm vs. mph vs. gear calculator method.