chevrolade

iTrader: (21)

6liter 4.56 gears im hitting 5th gear at the end of the track,12.7 @ 112 was my best....
im thinking on changing gear ratios but not sure on to what ide hate to make it slower lol what do yall think?

TrueBlueGTO

6l90e & 4.56!!

What's the vehicle, tire size, and engine dyno? Factory converter? What tune is in it? What's your trap speed? What RPM is it upshifting at?

Look through this thread to help you out:
https://ls1tech.com/forums/automatic...4th-gen-5.html

chevrolade

iTrader: (21)

its a 08 silverado,4500lbs 28inch tire, 12.7 @ 112 60ft was 2.1 nelson tuned shifting at 6500

IDRIVEAG8GT

6L90 with 4.56????!!!! <------ Dude I think that you might like 4.10's

poorhousenext

Remember, we told you, you wouldn't make it thru the 1/4 mile in 4th. Simple math.

https://ls1tech.com/forums/automatic...me-please.html

Your blowing thru 1st 29.55 MPH @ 6500, 2nd 50.33 MPH @ 6500 & 3rd 77.29 MPH @ 6500,. In 4th @ 6500 your top speed is 103.29 at 6500 RPM.

I think he might want to forget 4.10 too...

Remember no 1:1 4th gear, so it's effective 4.71 4th gear with a 4.10.

TrueBlueGTO

Switching to 4.10s would put him at 114.88 mph through the traps in 4th gear. Going with 3.90's would put him at 120.77 mph...which I would choose as it won't have your trans on the verge of upshift as the 4.10s would cause....or go with a taller tire.

chevrolade

iTrader: (21)

im going with 3.73s