fao bernie@ cts or any other knowledgable transmission peeps
#1
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im gonn agive you a scenario , and i would like the outcome if poss
and i dont want answers like BOOM etc etc i wanna know whats gonna fail and when ok
were talkin 4x4 transmission and diff ratios, if i was to run a rear (cosworth 4x4 btw) ratio of 4.27:1 and a front of 3.9:1 whats gonna happen , how will the car drive and for how long ??
i suspect centre diff failure, but how long will it last and is there any way to prolong its life ?
or to put it a little closer , rear of 3.58:1 and a front of 3.62/3.64:1 ? same again please
or 3.77:1 rear 3.62 front
is it possible to mismatch by such small amounts and expect to get away with it even slightly ??
![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
and i dont want answers like BOOM etc etc i wanna know whats gonna fail and when ok
were talkin 4x4 transmission and diff ratios, if i was to run a rear (cosworth 4x4 btw) ratio of 4.27:1 and a front of 3.9:1 whats gonna happen , how will the car drive and for how long ??
i suspect centre diff failure, but how long will it last and is there any way to prolong its life ?
or to put it a little closer , rear of 3.58:1 and a front of 3.62/3.64:1 ? same again please
or 3.77:1 rear 3.62 front
is it possible to mismatch by such small amounts and expect to get away with it even slightly ??
#5
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A small amount won't cause the center VC much issue as you talking the differences between worn and new tyres. A large amount and it will hate it, the center VC is basically trying to equalise the difference between the front and rear so will not like a large difference, the bigger the difference the faster you'll burn the thing out
.
However from what I remember ford had various options for playing around with the chain that was either to allowed you to run different diff combniations / or it was to change the torque split, it might have even done both. I can't remember
I'm sure berni would know.
Not much help I know but you can get away with running a 2wd rear diff of 3.64 and a 3.62 4x4 front without problems.
![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
However from what I remember ford had various options for playing around with the chain that was either to allowed you to run different diff combniations / or it was to change the torque split, it might have even done both. I can't remember
![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
Not much help I know but you can get away with running a 2wd rear diff of 3.64 and a 3.62 4x4 front without problems.
#7
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Couldn't you vary tyre sizes front to rear to help out try to get the rolling raduis's closer together?
I remember talking to Bernie about this. He reckons that the centre VC can handle a 10% difference between front and rear without any real problems.
I remember talking to Bernie about this. He reckons that the centre VC can handle a 10% difference between front and rear without any real problems.
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#11
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chip-3door,
why are you doing it in the first place?
to achieve a difference in power split i assume
why are you doing it in the first place?
to achieve a difference in power split i assume
no you cant adjust the power split by the diff ratios , it aint poss for longevity, and sierra diffs and there ratios are shit hence why i dont run sierra diffs .
#15
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if only there was room mate
if ya moved the engine over to the lhd innerwing ya mite get it in there
i got all me back end stuff on now i can show u that if your bored
its all buffty and painted now
just finishing it off 2moz just measing up shafts and stuff
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
if ya moved the engine over to the lhd innerwing ya mite get it in there
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
i got all me back end stuff on now i can show u that if your bored
its all buffty and painted now
just finishing it off 2moz just measing up shafts and stuff
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