track times disapointed........

[ff_jeff]

my 60ft with 3.23s was 2.4 1/8 ET was 10.1 at 69mph 1/4 was 15.6 at 89mph and with the 4.10s my best was 60ft 2.3 1/8 9.9 at 70mph 1/4 15.5 at 86mph.both times its probly been in the uper 80's degrees. and as far as the vibirations is that because the driveshaft is spinning a lot faster then it used too? thanks for all the input so far.

60 ft is the main culprit, but you should be in the mid 90's mph for your 1/4.
The vibration is probably the pinion angle. When you installed the new gears maybe the pinion angle was off a bit. Or maybe the gears werent set up right. You need a live tune. And runs without dubs. that weather is not that bad.
next time you race, Brake stall at the line and spin the tires a tad when you take off. IMO its better to spin out of the hole than to bog. With the stock stall your bogging.
with your mods, your ET and MPH are off.
Who tuned the truck?

[Fastime09]

Have u got a tune, man w/ that cam, stall & gear u should putting down some good times. I'm running a LS1 218/500 cam w/ stock trans and convertor w/ 373's. and Running mid 14's on motor..

[Oldblue5.3]

the cam and stall were installed by texas speed and performance the gears i installed myself but it was all tuned by texas speed i dont know really when it shifts but i know when it hit 3rd it starts to vibrate i think its rite at 80mph. do yall think the times and the vibration have to do wit the gears?

[RedHeartbeat]

if you're in third gear at 80, what rpm are you at? That is the RPM you need to have the driveshaft balanced at. If your local shop can't do it, find one that can. Also, see how much slip yoke engagement you have. Your slip yoke should not have more than 1" of slide before it bottoms out, otherwise it can wobble on the splines and cause an imbalance. Also be sure your tires are balanced at the speed in question, if possible. Most shops don't have adjustable speed balancers for tires.

[Wtfan18]

the cam and stall were installed by texas speed and performance the gears i installed myself but it was all tuned by texas speed i dont know really when it shifts but i know when it hit 3rd it starts to vibrate i think its rite at 80mph. do yall think the times and the vibration have to do wit the gears?

i went from 3:07s to 4:56s same drop kit same everything started getting NASTY vibrations at 80mph. put a 4 degree pinion shim in due to my flip kit i can do about 115 or so now before its a problem it has something to do with the pinion angle im guessing for you as well. i think the change in the speed of the driveshaft rotation makes it really noticeable that the pinion is off. my vibrations are nasty nast nasty scares me pretty good.