ls1 1990 VN

Need advice on what diff ratio I need for my new engine power.

I've been thinking 3.45.1

566 rwhp & 613 ftlb rwtq

Currently running 4.10.1 from my old setup

Running a 6sp T56
1st 2.66
2nd 1.78
3rd 1.30
4th 1.00
5th 0.84
6th 0.56

285-30x18 tyres

ls1 1990 VN

So many replies, so many different choices.....

Guess I'll go 3.73

MidwestChassis2

iTrader: (1)

I would search for a couple different online performance calculators as they will give you all kinds of insight to what will work best for you.

Carl at CRP

iTrader: (9)

http://www.wallaceracing.com/gear-speed.php

http://www.wallaceracing.com/Calculators.htm

ls1 1990 VN

Thanks Carl,

Good insite, Not sure what I can gather from the calculators. I need more real world imput from guys that have similar HP & TQ

99SSJarhead

iTrader: (2)

What are your goals with the car? Straight line track? Autocross? Fun street? Or highway cruiser? A few more specifics will help people get you in the right direction.

HCI2000SS

iTrader: (2)

I know it's not a direct comparison, but I run 4.10's with a T56 and about 600 rwhp & rwtq on the 150 shot. Honestly I hate this gear with the nitrous, but it's perfect n/a.

ls1 1990 VN

The odd track day being circuit sprints

Occassional drags, maybe 3 times a year

Generally street

I have just had my old LS1 516fwhp n/a taken out & this new engine in.

I have been running 4.10s but it now just blows the tyres 'circuit semi slicks'


The cars gone in for a set of 3.73s this morning, I gave it a lung full in 2nd gear & something in the diff didn't like it.

Had to settle on what I thought would work best.