Hey guys, Just wondering what the fastest speed any of you have traveled in your trucks. I was on a straight road with my diablo yesterday and I got my sierra up to 136 mph. I looked like it could have done more but a car was up ahead so I slowed down.

 

127 is my top, but that was on a dyno, and in 3rd hear.......

So I imagine somewhere around your speed, on a LONG STRAIGHT road!!

 

Little over 120 before the cam and without nitrous.
But with the 408 if I can control it probably a little over 140.

 

i've been around 155+ in my truck....i had a camaro next to me.....that was trying to keep up...hehe

 

155mph with 4.10's? was your tach pegged?

 

140 has been fastest Ive been and thats when it was totally stock. Still had more left in her but I was running out of straight road

 

Just looked at the video I posted the other day and at 120mph I was about 4900rpm.
That means I've got about 800 more rpm to pull. I wonder what I could hit??

 

its called overdrive buddy

 

well are speedo's stop at 120 so unless you got datalogging how do you know . ive had mine at a outstanding 99 or so . speedo just pegged lol

 

I dunno it stops at 99 for some reason.

But it gets there reallllll quick