What kind of fab & welding metal working skills do you have ?
What kind of budget are we talking about ?
Is the car going to be a racecar ?
or is it a cruiser, that'd be only possibly occasionally raced ?
or just a driver/Pro-touring hwy car ?
or suspension changes just so you can get a specific ride height/quality ?
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I like a real 4 link & watts linkage {you need the space to do it thou}
some stuff will need to be highly modified,
especially if you're going to put much power to it
I've used a couple of
Chris Alston Chassisworks kits,
made them work, used Ladders & 4 links, double adjustable,
a bit pricey but nice set-ups quality spherical heim-joints etc.
a good read/explanation of how stuff sort of works
http://www.cachassisworks.com/stories/techcac-003_web.pdf
View attachment 408734
Chris Alston Chassisworks Basis 4-link with poly street bushings kit {Cheap}
they don't make anything Mopar or B-body specific
View attachment 408735
CACW also has stuff for Torque Arm style kits
View attachment 408746
Almost any of them aren't Mopar Or B-body specific,
you'd have to adapt or possibly modify them
RJ Racecars/Quarter-max {Rickey Jones of NHRA Elite team P/S fame}
has some nice pieces too...
Extreme Adj. Billet 4 link billet chassis brackets/mounts $2400
Racecar professional fabrication pieces
{I don't think they make anything that's Mopar or B-Body specific}
View attachment 408732
RJ/Quarter-max Basic kits like $290, they have another better kit, for like $1600
View attachment 408733
There's a bolt-on 4 link deal from
Ride-tech,
like $1400 specifically for B-body kit,
View attachment 408731
good up-to about 500-600hp at the rear wheels,
if you beef/gusset up all the org. axle & spring mounts,
torque boxes everywhere etc.
you can use coil-over's or airwave/bags
A few Pro-touring guys have ran them & have loved them
good ride height & ride quality
Competition Engineering has some decent inexpensive stuff too
4-link kit for like $240, check out their website,
they have a lot of universal you fab stuff
View attachment 408747
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but there's different set-ups out there
even some "bolt-in/bolt-on", with little fabrication or welding
among many of the stuff already mentioned by others here
far more than only one way to skin a cat
far more than one specific supplier too
speed & automotive hobby is $$$ relative,
how fast or how low you wanta' go ?,
depends on your mech. abilities & your specific Budget...