VS GETRAG and 3.45 Diff Gears?

[VS-S-PACK-UTE]

hi guys, i own a vs and it is equipped with a getrag box. i have heard that the gearing is different in these as apposed to the T5's? anyways what im wondering is will throwing a set of 3.45 diff gears make much of a difference due to the gearbox ratio? As it is the car sits on about 2100 on the freeway doing 100. Thanks in advance.

[VrWagz1]

your running 3.08:1 now, so you can have a little guess at how it would effect it. Prob 2500 at 100km. But its a cheap way to effectivly pickup "off the line power", without actually doing any engine mods.

[VS-S-PACK-UTE]

ok thanks mate, any idea on how much they cost to be installed?

[Haydz]

300+ depending on the place you take it.

[VrWagz1]

TBH no i dont, i have seen figures or around 5-600 to get a diff tinkered with. Gears for one arnt usually cheap and it takes a bit of time for someone to change them, so i dont think that would be unreasonable to expect that sort of price.

[VS-S-PACK-UTE]

was that 300 including gears or just labour? because i can get some gears cheap.

[Haydz]

that will be just labor. your best off sourcing your own diff gears.

ive driven a ecotec getrag vs that had 3.55 diff gears and it pulled quite well and was rather zippy. im planning to go 3.45's in my vs ute with a l67 and getrag

[old mate]

hi mate, the gearing change will be as follows.

this shows the road speed at 5500 rpm at standard gearing (3.08 to 1) (17 inch wheels, 235/45 rubber).

1st: ratio 3.829:1 - 56.53 km/h
2nd: ratio 2.199:1 - 98.44 km/h
3rd: ratio 1.401:1 - 154.51 km/h
4th: ratio 1.000:1 - 216.47 km/h
5th: ratio 0.809:1 - 267.56 km/h

100 km/h at 2055 rpm

now, changing the diff gears to 3.45 will do this:

1st: ratio 3.829:1 - 50.47 km/h
2nd: ratio 2.199:1 - 87.88 km/h
3rd: ratio 1.401:1 - 137.27 km/h
4th: ratio 1.000:1 - 192.27 km/h
5th: ratio 0.809:1 - 238.16 km/h

should give you 2309 rpm at 100 km/h with the 3.45 ratio gears.

depending on wheel size these figures wont be 100% accurate but its an alright guide.

but it will be geared around 12% shorter regardless of wheel size.

[VS-S-PACK-UTE]

thanks heap mate, very useful info. cheers