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The MM K member ( or stock K member with A-arm pickup points raised as described in the Mathis book ) along with Racecraft 2" drop spindles will get you close to an SLA. You will get more negative camber with suspension compression. Not exactly the same as an SLA but comes pretty darn close.
 

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MM kmember, Griggs spindle adapters, SN95 spindles, upper control arms from Summit, MM SN95 lower control arms. Fabricated upper shock mount. Zero scrub using 18x11 rims.
 

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Very cool. Where did you source the Penskes from? Had you been running the car with a normal strut setup (presumably with the MM K-member and A-arms) before going to the SLA?
Hi, yep this was a strut car that was mostly for street use. I autocrossed it once with the struts and it sucked big time, even with the K-member and A-arms. It wasn't until the SLA that it became a truly competitive autocross car. It's literally a night-and-day difference - so much grip, so solid. The shocks I got directly from Penske Racing with custom valving - these too made a major difference, particularly in quick transitions like slaloms - so much control it's unreal.
 

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Would you mind sharing a part number for the summit upper arms?
SPC 92142 for the upper control arms. Use with the Chrysler type ball joints Moog K772.

FYI the Griggs spindle adapters took about 9 months to arrive. Another option is the Whitby Motor Cars spindle adapters https://www.whitbymotorcars.com/product/sai-mod-kit/ but they have a greater steering axis inclination (9 degrees advertised).
 

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Yeah you just tell them what your spring rates are, weight of the car, and what the car will be used for. It helps if you can include corner weights. Emphasize it will be used for autocross where you need superior control in quick transitions, e.g. abrupt turning and braking. It took some trial and error. They nailed the front shocks the first try, but I had to send back the rears for revalving - they were a bit too stiff initially. IIRC I don't think they charged me for the rear revalving, and their turn around time was really quick, within a week. Penske Racing as you would expect was very professional.
 

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