Can someone explain diffs to me please
01-09-2011, 08:43 PM
#1
Can someone explain diffs to me please
What is a 3.62 diff, 7" diff etc. I often see these terms and not sure what they refer too. It's only as I'm on the look out for front and rear for mine...
Can anyone give me a run down of the Cosworth diffs and maybe a quick explanation....
Thanks in advance
Dan
Can anyone give me a run down of the Cosworth diffs and maybe a quick explanation....
Thanks in advance
Dan
01-09-2011, 08:50 PM
#2
3.62 is the final drive ratio. The size in inches is the physical size of the diff's width.
The 4x4 and all other models use a 7" diff, the 2WD Cosworth however has a 7.5" diff (And of course a different beam accordingly)
The 2WD diff is stronger, but this of course will not fit a 4x4, as it's to big, unless you modify it to do so of course.
Martin
The 4x4 and all other models use a 7" diff, the 2WD Cosworth however has a 7.5" diff (And of course a different beam accordingly)
The 2WD diff is stronger, but this of course will not fit a 4x4, as it's to big, unless you modify it to do so of course.
Martin
01-09-2011, 08:53 PM
#3
3.62 is the ratio and the 7 or 7.5 is the size of the crown wheel in inches
Iirc 2wd was 3.64 ratio and they're 7.5 inch standard
4x4 are 3.62 ratio and they're 7 inch standard
You can get different ratio diffs for example. 3.9/3.4/4.4 and you also get a 9inch motorsport diff that fits in 2wd beam.
Standard rear diffs are all a viscous limited slip diff and the 4x4 front is a open diff.
You can get diff upgrades like plated or more "pumped up" viscous diffs.
A plated diff works on ramps, when on throttle a pin rides up a set degree ramp and when off throttle it will ride up a ramp the opposite way.
These ramps can be set so the diffs are unlocked or unlocked whilst under braking and on throttle.
Then you get active diffs as per in the wrc car, and these are controlled by hydraulic pressure, the pressure pushes the plates in the diff together for more locking, or off to unlike the diff. Very clever stuff and on a wrc car the diff pressure is controlled with sensors on each driveshaft, steering angle, throttle and brake position aswell!
Think I might have gone a bit ott but now you know
Iirc 2wd was 3.64 ratio and they're 7.5 inch standard
4x4 are 3.62 ratio and they're 7 inch standard
You can get different ratio diffs for example. 3.9/3.4/4.4 and you also get a 9inch motorsport diff that fits in 2wd beam.
Standard rear diffs are all a viscous limited slip diff and the 4x4 front is a open diff.
You can get diff upgrades like plated or more "pumped up" viscous diffs.
A plated diff works on ramps, when on throttle a pin rides up a set degree ramp and when off throttle it will ride up a ramp the opposite way.
These ramps can be set so the diffs are unlocked or unlocked whilst under braking and on throttle.
Then you get active diffs as per in the wrc car, and these are controlled by hydraulic pressure, the pressure pushes the plates in the diff together for more locking, or off to unlike the diff. Very clever stuff and on a wrc car the diff pressure is controlled with sensors on each driveshaft, steering angle, throttle and brake position aswell!
Think I might have gone a bit ott but now you know
01-09-2011, 09:48 PM
#6
3.62 is the ratio and the 7 or 7.5 is the size of the crown wheel in inches
Iirc 2wd was 3.64 ratio and they're 7.5 inch standard
4x4 are 3.62 ratio and they're 7 inch standard
You can get different ratio diffs for example. 3.9/3.4/4.4 and you also get a 9inch motorsport diff that fits in 2wd beam.
Standard rear diffs are all a viscous limited slip diff and the 4x4 front is a open diff.
You can get diff upgrades like plated or more "pumped up" viscous diffs.
A plated diff works on ramps, when on throttle a pin rides up a set degree ramp and when off throttle it will ride up a ramp the opposite way.
These ramps can be set so the diffs are unlocked or unlocked whilst under braking and on throttle.
Then you get active diffs as per in the wrc car, and these are controlled by hydraulic pressure, the pressure pushes the plates in the diff together for more locking, or off to unlike the diff. Very clever stuff and on a wrc car the diff pressure is controlled with sensors on each driveshaft, steering angle, throttle and brake position aswell!
Think I might have gone a bit ott but now you know
Iirc 2wd was 3.64 ratio and they're 7.5 inch standard
4x4 are 3.62 ratio and they're 7 inch standard
You can get different ratio diffs for example. 3.9/3.4/4.4 and you also get a 9inch motorsport diff that fits in 2wd beam.
Standard rear diffs are all a viscous limited slip diff and the 4x4 front is a open diff.
You can get diff upgrades like plated or more "pumped up" viscous diffs.
A plated diff works on ramps, when on throttle a pin rides up a set degree ramp and when off throttle it will ride up a ramp the opposite way.
These ramps can be set so the diffs are unlocked or unlocked whilst under braking and on throttle.
Then you get active diffs as per in the wrc car, and these are controlled by hydraulic pressure, the pressure pushes the plates in the diff together for more locking, or off to unlike the diff. Very clever stuff and on a wrc car the diff pressure is controlled with sensors on each driveshaft, steering angle, throttle and brake position aswell!
Think I might have gone a bit ott but now you know
That will make my searching an awful lot easier!!
Thanks jimbo
Dan
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01-09-2011, 10:17 PM
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sorry to hijack your thread, but i dont surposse you know if a yb front diff is the same as a 2.8 4x4 sierra?
or are the shaft sizes different?
also top marks on the explanation!!
or are the shaft sizes different?
also top marks on the explanation!!
Last edited by TRAY_25; 01-09-2011 at 10:19 PM.
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