Does a 40 MM Lift on 100 Series with IFS need a diff drop?

axlcorro
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Does a 40 MM Lift on 100 Series with IFS need a diff drop?

Unread post by axlcorro » April 6th, 2016, 6:09 pm

hi, ive just picked up the v8 cruza ( ifs ) from TJM, got a 40mm lift including strengthening brackets. they said no need to include a diff drop kit. what are your thoughts on no diff drop kit included ? the front still looks lower than the back. thanks. peter.

Peter Aawen
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Re: Does a 40 MM Lift on 100 Series with IFS need a diff dro

Unread post by Peter Aawen » April 8th, 2016, 9:05 pm

The front is MEANT to be lower than the back?!? If it isn't, when you add ANY load to the vehicle you'll be possum spotting in the trees with your lights & otherwise stuff up the steering & handling dynamics that change as you drive the vehicle!? So they are designed to have the front lower than the back - that way, when a driver &/or passenger gets in the car; when you throw a bag in the back; or just when you start to drive forwards, the front of the car doesn't end up higher than the rear & shine your lights into the tree tops or compromise the steering & handling.... :rolleyes:

Oh, & no, they don't generally need a diff drop just so long as you don't lift the front any higher than 40mm or so - if you DO lift it higher, the diff drop is necessary to stop the CV's from self destructing PDQ due to the excessive angles they'd be forced to operate on & to otherwise return the steering & front suspension angles & tolerances to workable levels.
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axlcorro
Here and there
Posts: 48
Joined: February 9th, 2014, 9:18 am

Re: Does a 40 MM Lift on 100 Series with IFS need a diff dro

Unread post by axlcorro » April 9th, 2016, 8:16 am

thanks peter,i was a little concerned as the cruza was fully loaded (all rear seats removed)with all camping and recovery gear including fridge when the lift was done. only a front passenger is the extra weight that will be included. do you think i should ask them to lift the front safely just a little more. i am putting a set of 285 75 r16 muddies on next week. thanks peter. ps the front looks quite a bit lower than the back.

Peter Aawen
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Re: Does a 40 MM Lift on 100 Series with IFS need a diff dro

Unread post by Peter Aawen » April 9th, 2016, 12:13 pm

NO!!!

You can't really lift the front any more safely; besides, Lifting the front more WILL result in damage/failures over time due to the angles that those components will be forced to work on & WILL disrupt the (critical for safety etc) steering & front end suspension geometry as well as the front/rear braking bias & a few other critical things!!

If you want it level front/rear for some perverted aesthetic reason (bearing in mind that the 'level look' is just wrong on an unladen 4WD & will make it look like an overweight wannabe ricer car!!! :sillywink: ) then drop the rear down to match the height up front, but don't stuff your very important steering around Tby lifting it more than the design is capable of safely handling!! Besides, if you just wait a little while you'll probably find the back end will sag & settle down a bit back there anyway.... :thumb:

You shouldn't worry too much, the rear on an unladen 4WD can easily be 70-100mm+ mm higher than the front in order to safely support a full travelling load without causing spring bind or bottoming when you go away even if you never exceed the vehicle's GVM, and that tail-up stance when it's empty is a sure sign that you do actually use the thing as a 4WD - lose that stance & you not only compromise the vehicle's reliability, longevity, & most importantly, safety; but you'll also lose any respect other ('real') 4WD'ers would've had for you, your vehicle, & its' set-up!! :petrified:

But no matter what you do, an IFS suspension vehicle is pretty much limited to about a 40mm lift up front without making expensive & 'not straightforwards' changes to keep the critical steering & front suspension angles within 'safe operating margins' - a diff drop can help, but really, unless your mods involve replacing the front arms/struts with longer/taller/more expensive gear &/or cutting off & welding on new pivot points for said gear, then you are really only playing around with changing your static ride height anyway, you aren't really gaining any more 'travel' up front regardless of how dangerous you are making the vehicle to drive!!

Sooo, Leave the front alone, as it is now it should readily take those tyres (& it'll probably make the stance look better anyway) & once loaded & the springs have settled over 50-100K kms, you will be gob-smacked that you ever considered the back looked too high! :thumb:
An Ex-Service person is someone who thought enough about their country & how great it is, how lucky we are to live here, to write a blank cheque made out to 'The People and Commonwealth of Australia' for the value of 'Up to & including my Life!'

axlcorro
Here and there
Posts: 48
Joined: February 9th, 2014, 9:18 am

Re: Does a 40 MM Lift on 100 Series with IFS need a diff dro

Unread post by axlcorro » April 10th, 2016, 3:05 pm

thanks again peter, im a bit of a stress freak and im glad to say you have again put my mind at ease. PS= the tyres get put on ,on tuesday,very good price i thought from bob jane at $250 ea fit and balance

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