diff gears 3.45 or 3.7???

[stateo 304]

gday guys getting sick of the **** 3.08's im getting my diff done up soon with a spool i dont know what gears to go with 3.45 or 3.7

can anyone tell me what revs these gears will sit at @ 100kms

any 1/4 times with them?
any genral info
cheers

 

[VSIIBerlinaL67]

get 3.7's, 3.45s wont be worth it, im gonna get 3.7's when i save up some cash, with 3.45s at 100ks it will be sitting at around 1950 with 3.7's around 2100.

use this to work it out http://kowboy1.bananaman.com/xycool/gearhead.swf and with this program you need to put in the transmission gear ratio to get the proper calculation , for auto these are the ratios

1st 3.06
2nd 1.63
3rd 1
4th 0.7

 

[stateo 304]

cheers mate that site was good, can anyone with 3.7 verify they sit at 2300(thats what the site said)????

 

[TheForgotten]

235/35/18, 3.7 diff, 2400rpm
can be a bit more accurate if I know you tyre sizes

 

[stateo 304]

hi mate mine are 235x40x18 cheers

 

[TheForgotten]

235/40/18 3.7 diff =2343rpm
235/40/18 3.45 = 2184rpm
235/40/18 3.91 =2476rpm

 

[stateo 304]

cheers mate do u run 3.7s ?

 

[TheForgotten]

nah just 3.08. when I put an LSD in I'm probly gonna have 3.7's, but that could be a while yet

 

[stateo 304]

ok cheers for the advice did u do those calcs on that site or do u know someone with 3.7s

 

[SaGe]

my mates 5spd vr calais had 3.9 lsd and it sat at 2600rpm in 5th at 100kmh