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Lifting rear suspension

Posted: Tue Jun 12, 07 10:50 pm
by kev73dart
Hi, I know this might sound like a dumb question considering I have been working on cars for years, but what is the best / most cost efficient way of raising the rear suspension on my 74 Dart Swinger.

I am favouring for air shocks, but some have said the cheapest way is to get extended rear spring shackles.
I only want to raise it about 2 to 3 inches

Kev

Posted: Tue Jun 12, 07 11:06 pm
by Anonymous
Ahhhhhhhhh jack up kit

Posted: Tue Jun 12, 07 11:09 pm
by Dave-R
NEITHER! Both are bad practice.

Get the correct springs. or get your existing springs re tempered to the arch you require.

Posted: Wed Jun 13, 07 6:52 am
by Anonymous
Fit a pair of Mono leaf springs, that will do it :)

Posted: Wed Jun 13, 07 9:50 am
by Dave-R
Wil just hapens to sell them too! :lol:

My mate neil in Sunderland fitted a pair and they worked a treat. He has a thread on here about it showing the results.
They were if anything just a little too high at first but have settled to a perfect stance now.

Posted: Wed Jun 13, 07 2:43 pm
by Anonymous

Posted: Fri Jun 15, 07 11:46 am
by dustymopar
Mono's worked for me - just need a beam axle at the front now :lol:

These were an inch over stock - and the rest!!

Posted: Sat Jun 16, 07 10:11 am
by MilesnMiles
my monos raised the car 2", thread to follow with pics later today!

Posted: Sun Jun 17, 07 9:09 pm
by Anonymous
Hi guys, just curious as to whats wrong with extended shackles :read2:

Posted: Sun Jun 17, 07 9:25 pm
by Dave-R
Because of the way rear springs are mounted the bushes tend to act like anti-roll bars. Which is why it is always good to fit poly bushes here.

This feature along with anti-squat control are optimised by the spring attatchment points.

"Lowering the rear mounts on shackles will de-arch the springs and effect chassis dynamics - almost always adversely" it says here in this book I am refering to. :read2:

"This negatve effect is caused by a progressive increase in the spring rate as the spring arch is reduced. This means the spring will get stiffer faster - usually causing instabillity".

Posted: Sun Jun 17, 07 10:15 pm
by MilesnMiles
Yes, as often seen on jack-the lads Cortina/ Capri in the late 1970s! Horrible handling.

Posted: Sun Jun 17, 07 11:55 pm
by Anonymous
:thumbright:

Posted: Wed Jun 20, 07 10:47 pm
by Mick
Kev
Come round and have a look at my 74 Duster, that's got SS springs.
Mick