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Discussion Starter #1
HI FFfriends,
I’m considering converting my completed MkIII 4-link to a 3-link to improve handling for autoX and road courses. Has anyone done this? Is there a source for a conversion kit, or plans, or am I fooling myself about the wisdom of this course?

Thanks in advance for input.
Eric
 

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7,841 Posts
Factory five has the kits to do this. If your Mark 3 is new enough, it might already have the upper link mount welded in place.
Mike
 

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Discussion Starter #3
Factory five has the kits to do this. If your Mark 3 is new enough, it might already have the upper link mount welded in place.
Mike
Thanks Michael. I had been told that FFR offered the kit, but I’m also interested to know if anyone else has done it or has input on the advantages of the end result.
 

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I did it years ago, a pain to do but well worth it! It’s more planted in corners especially if there’s bumps. I autocross it regularly and do well. I had to cut out part of the back wall behind the passenger seat to access the Bolt in bracket, and buy a drill extension to drill from underneath. I recommend it.
 
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Absolutely do it. The difference is amazing. The only difficult part is the frame mount for the 3rd link. It goes very near where your right hand 4 link attaches. On my MkII I had to cut away part of the 4 link mount. Compare this pic of 4 link
4-Link Rear Suspension - Factory Five Racing
to this pic of 3 link
3-Link Rear Suspension - Factory Five Racing
I only removed what I needed to of the 4 link bracket and actually used the remainder as reinforcement for the 3 link bracket. Plan to remove the passenger seat and cut an access hole in the aluminum panel. It makes all the difference. The kit 3 link bracket comes w/ holes in it to bolt it to the underside of the cross tube. I cut a plate w/ matching holes, dropped a couple of G8 3/8 bolts through and welded the heads to the plate. I pushed that bolt plate into the open end of the frame tube and maneuvered it so the bolts dropped through the holes. Another note; you can install the banana bracket, the panhard bracket, and the new axle brackets, while still driving the car as a 4 link. I did that so I could do it in stages and still drive the car. The final stage was removing the top 4 links, doing the 3 link frame bracket, and installing the panhard and 3rd link. BTW a close enough set up for pinion angle is, before removing the 4 links, look at the clearance from the rear surface of the banana to the diagonal panhard tube. It is about 3/8" so adjust your 3 link to the same gap. I drove mine for months that way before actually measuring pinion angle.
 

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I completed this upgrade in 2018, one year before I sold my Mark III. Grinding and drilling was the most time consuming part.

Here are the parts, sources and 2018 prices:

Breeze: $857.95
(#21108) Spanner Wrench Set for QA1 Proma-Star Coil Over Shocks 1
(#70676) 3-Link Rear Shock Kit, Single Adjustable, w 250lb/in Springs 1
(#70730) Rod End Rear Lower Control Arm Kit 1

VPM: $210
Vintage Performance Motorcars: Both items
Banana Bracket Support Brace Kit
Frame Bracket Support Brace Kit

Factory Five: $650
#13181 - 3-Link Retrofit Assembly
#15237 Traction Lok Bracket Set (free)
(#5974 had older 4-Link style Traction-Lok Brackets, so FFR provided the upgraded bracket set for free)

3L_trunk_view.jpg

Trunk view (had to relocate FFMetals battery box from trunk center to left side)


3L_left_rear.jpg

Left side view (blue tape to remind me to torque bolts to spec)

3L_hole_pass_seat.jpg

View from passenger seat into access hole (towel soaked with water to reduce hot sparks)

3L_right_rear.jpg

Right rear view

Good luck and enjoy the upgrade.
Nate

Sold Fall 2019
FFR #5974 BRG (PPG-Subaru Green), 306, 93-GT-40 heads, E-cam, Hypereutectic D&D rebuilt T-5 trans, 3-link, 3.73 rear, North Racecars A/C, Firewall Forward and expanded footboxes, Kirkeys, CobraEarl Trunk, wipers/washer, Custom Tonneau cover (Phil & Kay), FFR Softtop, and 15" Cooper Cobras.
 

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990 Posts
2X on Mark's QA1's and rod-end LCA's. These two mods significantly improve the ride quality of a three-link car in my opinion. Scott

362224
 
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