Bigman1

Hi people, I have a 3dr cosworth which am building and converting it to a 4x4. what I'd like to know is please if the standard 4x4 diffs are capable of 500bhp, if not, what diffs and ratios shall i need in order to manage that sort of power and be reliable many thanks!!

big_wig_074

ill answer your first question
no
second answer is here
http://www.randbmotorsport.co.uk/sho...ID=3&offset=20
rear diff £1022 plus delivery
front diff £581 (plus £218 installation)including delivery
front diff casing £752 including delivery
so not exactly cheap

Bigman1

Hi mate, thanks for the link, is there no other cheaper option? I was reading a thread where it stated there are some cars out there running fairely decent power with low ratio diffs but I cant figure out what ones they are using

R4N SS

iTrader: (6)

keep it rwd

ive got a 7" 4x4 cossie diff in my saff and going for close to 500bhp when the yb goes in and i just know that the diff will break in the first couple of launches

Gonna get a 7.5" in there once it goes

grcossie

Use your 7,5" oe diff then the 7" 4x4.
I will using a Scorpio Cosworth 7,5" diff on my escos, it`s stronger than the 7" and it`s bolt on whit 4x4 drive shafts

ajamesc

its torque that kills them and standard diffs fall apart with about 350lb ft then the crown wheel and pinions brake as well with more torque if you really abuse them and why are you 4x4,ing it just one big can of worms as the gearbox,s are week too its just big money getting it all to cope!

big_wig_074

not really,but thats just the beginning of your problems,the gearbox will also break at that level,no ifs or buts,it WILL break,and the price for a fixit,which is nowhere near the most expensive gearbox. £3050 (plus £275 for an uprated 1st gear)!!!!
http://www.randbmotorsport.co.uk/sho...ID=3&offset=10

big_wig_074

and just for a balanced approach,in case you think he is more expensive than others,here is the link to reylands transmission stuff,its not cheap going 4x4!
http://www.reyland.co.uk/Parts.asp?ID=4

R4N SS

iTrader: (6)

you will need the driveshafts if using a 7.5" diff as they are different from 4x4s

Bigman1

wow, thats a lot to take in!!

NEIL A

iTrader: (6)

At around 500 bhp you may get away running a standard 7.5" rear diff, but you will need to uprate the front diff to a titan,gripper,quaife or similar front. Ideally you would want a thickwall front housing but if it isnt running huge torque you could try a standard case with a brace plate fitted.

marco polo

iTrader: (1)

ran

your right but most granada's have 7.5" diff with 100mm drive shafts like the 4wd cossie

Bigman1

cheers for info!!