as said theres different ones, not just wr and cr, heard good and bad reports about them. diff's arent the best but give it a go, only going to be 50 or whatever to change to a F20 if it goes tits up :thumbs:

Its going to be for a track only car, the f18 cr I've been offered comes with flywheel,clutch and equal length
shafts. so I think I'll give it a go..
that's unless some one can explain a good reason not too.

personally id got for the F20 but thats just me, better ratios for drag use etc... hence why i swapped a F18 for one.
im pretty sure theres more than just your basic F18WR and F18CR, theres a few from what iv heard but not too sure whats best

F20 is the one you want. F18's are not as strong.

http://www.opel-infos.de/getriebe/f18.html

Cheers Jed, looked on hear! there's 1001 different ratio's but the F18 out astra F look's good:thumbs:

[Edited on 09-01-2013 by daine]

[Edited on 09-01-2013 by daine]

I've always found the F20 just right, if you can find one from a 4x4 they are a bit shorter.

the f18 I can have, with clutch and flywheel Jed is on an astra mk3 sport, will this ratio be ok???:0

theres different F18's, loads of differences in the ratios in them.

I had f16 on my xe blew the diff with in 2weeks fitted a f20 and couldn't fault it

ive got an f18 in mine now i havent had a problems with it good box

I had f18 on mine for few weeks and it was shit as it was long ratio just revved for ever and was boring I got f16 now and can't fault it.

Thought the f16 was only shorter in first 2 gears than an f20 and then the same! what about the F18!?!?
they any good or is it just newer?:boggle:

Shorter gear ratios, so will get off mark quickens but top end speed will be reduced overall

putting a C20XE in me track car and was wondering which gearbox would suit and what is the
difference in all 3 :thumbs: