66-69 Mercury Comet REAR SUSPENSION

RRS 4 link alternative for 66 to 69 Mercury comets

Leaf springs were fine back in the day when you had no better options.

 

DITCHING your 66 to 69 Mercury Comet archaic leaf spring suspension system for a 3-link set-up brings many advantages. Lower unsprung weight giving improved suspension response, handling and braking, you get simple height adjustment, and reduced torque steer during suspension travel — especially when cornering — less differential rotation (axle wind-up) under hard acceleration and better power handling.

RRS 3-link bolt-in rear suspension kit including axle housing and drum in disc rear brake upgrade for 66-69 Comet

With this in mind, RRS has developed three-link rear-end kits — available in bolt-on (no welding to the housing) or weld-on (weld-on housing adaptors) designs. The kits can be purchased in various forms, from a ready-to-run rear diff and suspension assemblies complete with centre, axles and brakes to a DIY bolt-on to your own 9" housing.

 

It’s an incredibly easy set-up to install, as you can see in this video  Matthew installs one into a Craig Donaldson's partially finished XM station wagon.

STEP-BY-STEP

XY Falcon under side(similar to Mercury Comets 66-69 shot showing shock mounts pinion leaf spring front eyelets.

1.  The key points are the front leaf springs mounts (A), shock mounts (B) and pinion snubber mount (C). RRS uses these original mounting locations for its bolt-in three-link kit.

XY Falcon which is the same wheel arch as 68 Cometwithh RRS offset trailing arms and tubbed to the rails for wide tyres

2. Prior to installation, this car had been mini-tubbed — the inner wheel wells had been widened out to sit flush with the chassis rails. To take advantage of the extra room, it’s then customary on leaf-sprung Falcons and Mustangs to move the spring mounts from the outside of the rail to the inside. The RRS kit uses offset arms, minimizing fabrication and engineering while maximizing space.

the long torque arm creates a torque circuit imporving power transfer for improved launch

3. This twelve hundred horsepower rated torque arm is the heart of the system. In a stock suspension setup, the torque travels down the tail-shaft through the axle housing, interacts with road, then travels through the leaf springs, down the chassis rails back to the engine mounts.

In the RRS 3 link the torque travels down the tail-shaft through the axle housing, interacts with road, then reverses and travels back through the axle housing and along the torque arm. This torque circuit is the most efficient way to get the power down in monocoque chassis street car.

Upper coil over frame 1 68 Comet Watts linkage mounting frame for 67 Mercury Comet 2

4. Theses sturdy bolt-in frames locate the dial-adjustable coil-overs (1) and the Watts linkage frame (2).

RRS 3 link upper shock mount frame installed

5. Before installing the upper shock mount, unbolt and remove the pinion snubber. Then simply hold the upper shock mount up in place, insert the two large bolts into the original shock mount holes (be sure to fit the heavy-gauge washers on the inside) and lightly nip up the nuts. Then refit the two snubber bolts through the mounting plate.

6. Push the Watts linkage frame, clamp and drill holes place spreader plates and torque up nuts.

Bolt on axle housing brackets  suits XR to XY

7. The RRS 3 link is supplied with either bolt-on (pictured here) or weld on diff adaptors, the bolt on adaptors take up the leaf spring centre bolt mount.

weld on axle housing brackets

8. The RRS 3 link is supplied with either bolt-on  or weld on diff adaptors, the bolt on adaptors (pictured here) the weld-on adaptor are just that welded on to the housing as to line up with leaf spring front eye bolts.

9. This video show the rest of the axle housing prep needed before fitting the axle housing back in the car.

66-69 Comet front seat bolt hole RRS cross member tab
66 67 68 69 Mercury Comet rear suspension front cross member

10. The next step is to install the front cross member, the self locating outer tabs, drill the holes

66-69 Mercury Comet off set trailing arms

10.  The RRS trailing arm uses large urethane rod ends, allowing for sufficient angular deflection while maintaining accuracy and stability. Note the arms are offset, allowing for greater tyre and calliper clearance than original 2.5in-wide leaf spring.

multi position lower shock mount

11.  A significant amount of height adjustability has been built into the kit. The four holes on the lower shock mount bracket in combination with the four holes on the diff housing mount provide more than 75mm of height adjustment. Two bolts must always be used when attaching shocker mounting brackets to the differential housing.

66-69 Mercury Comet rear suspension upper coil over upper mount

12. Now it is time to put the housing in place, place the assembled housing trailing arms, and torque arm on a jack and wheel it into place. Attach the trailing arms and over centre link (the Heim joint at the end of the torque arm), move the housing to ride height, and connect the coil overs.

66-69 Mercury Comet Watts linkage including in the RRS 3 link rear suspension upgrade

7 levels of adjustment

  • Ride height
  • Roll centre
  • Lateral link
  • Spring pre-load
  • Parrallel link
  • Pinion angle
  • Shock

12. Install the Watts linkage.

3 LINK OPTIONS

Customer supplied 9" housing

Bolt - on

Weld - on

Fully Configured on RRS supplied 9" Housing

Eliminate the leaf springs

  •  The RRS 3 Link rear suspension system boasts dramatically improved suspension geometry over the inferior factory leaf spring set up.

Torque Arm advantages

  •  The RRS 3 Link comes a long torque arm, the advantages are: anti squat, anti dive, pinion angle adjustment, ultimate torque circuit improvement, & load transference.

Kit includes

• Mumford link mount frame assembly

• Cross member assembly

• Torque arm

• Upper shock mount frame

• Trailing arms

• Mumford linkage assembly

• Over centre link assembly

• Differential mounting brackets

• Coil over shock assembly

• Coil over shock adjustment tool

• Shock mount brackets

• All nuts, bolts& spacers

• Detailed fitting instructions

The superior geometry of the RRS 3 Link results in drastically reduced roll under steer, accurate turn in & firm flat cornering.

3-LINK OPTIONAL EXTRAS

AXLE31

31 SPLINE AXLES

High Quality Axles with optional F100 size bearings

  • Increased Load Limits of Wide tyres
  • Increased Horse Power Capability
  • Increased Durability

DIFF31

TRU TRACK DIFF CENTRE

High Quality 31 Spline Diff Centres

  • Daytona Pinion Snout
  • 3140 Yoke (massive uni)
  • Strange Casing

 

 

Return to 66-69 Mercury Comet Index Page

Revelation Racing Supplies

(61) 02 9907 3755

US Toll Free 866 597 4662

RRS PTY LTD

4/45 Kemblawarra Rd

Warrawong NSW 2502

Sydney Australia

 

(61) 02 9907 3755

US Toll Free  866 597 4662

Revelation Racing Supplies

RRS 4 link alternative for 66 to 69 Mercury comets
RRS 3-link bolt-in rear suspension kit including axle housing and drum in disc rear brake upgrade for 66-69 Comet
XY Falcon under side(similar to Mercury Comets 66-69 shot showing shock mounts pinion leaf spring front eyelets.
XY Falcon which is the same wheel arch as 68 Cometwithh RRS offset trailing arms and tubbed to the rails for wide tyres
the long torque arm creates a torque circuit imporving power transfer for improved launch
Upper coil over frame 1 68 Comet Watts linkage mounting frame for 67 Mercury Comet 2
RRS 3 link upper shock mount frame installed
Bolt on axle housing brackets  suits XR to XY
weld on axle housing brackets
66-69 Comet front seat bolt hole RRS cross member tab
66 67 68 69 Mercury Comet rear suspension front cross member
66-69 Mercury Comet off set trailing arms
multi position lower shock mount
66-69 Mercury Comet rear suspension upper coil over upper mount
66-69 Mercury Comet Watts linkage including in the RRS 3 link rear suspension upgrade

Revelation Racing Supplies

RRS 4 link alternative for 66 to 69 Mercury comets
RRS 3-link bolt-in rear suspension kit including axle housing and drum in disc rear brake upgrade for 66-69 Comet
XY Falcon under side(similar to Mercury Comets 66-69 shot showing shock mounts pinion leaf spring front eyelets.
XY Falcon which is the same wheel arch as 68 Cometwithh RRS offset trailing arms and tubbed to the rails for wide tyres
the long torque arm creates a torque circuit imporving power transfer for improved launch
Upper coil over frame 1 68 Comet Watts linkage mounting frame for 67 Mercury Comet 2
RRS 3 link upper shock mount frame installed
Bolt on axle housing brackets  suits XR to XY
weld on axle housing brackets
66-69 Comet front seat bolt hole RRS cross member tab
66 67 68 69 Mercury Comet rear suspension front cross member
66-69 Mercury Comet off set trailing arms
multi position lower shock mount
66-69 Mercury Comet rear suspension upper coil over upper mount
66-69 Mercury Comet Watts linkage including in the RRS 3 link rear suspension upgrade
RRS 4 link alternative for 66 to 69 Mercury comets
RRS 3-link bolt-in rear suspension kit including axle housing and drum in disc rear brake upgrade for 66-69 Comet
XY Falcon under side(similar to Mercury Comets 66-69 shot showing shock mounts pinion leaf spring front eyelets.
XY Falcon which is the same wheel arch as 68 Cometwithh RRS offset trailing arms and tubbed to the rails for wide tyres
the long torque arm creates a torque circuit imporving power transfer for improved launch
Upper coil over frame 1 68 Comet Watts linkage mounting frame for 67 Mercury Comet 2
RRS 3 link upper shock mount frame installed
Bolt on axle housing brackets  suits XR to XY
weld on axle housing brackets
66 67 68 69 Mercury Comet rear suspension front cross member
66-69 Comet front seat bolt hole RRS cross member tab
66-69 Mercury Comet off set trailing arms
multi position lower shock mount
66-69 Mercury Comet rear suspension upper coil over upper mount
66-69 Mercury Comet Watts linkage including in the RRS 3 link rear suspension upgrade
RRS 4 link alternative for 66 to 69 Mercury comets
RRS 3-link bolt-in rear suspension kit including axle housing and drum in disc rear brake upgrade for 66-69 Comet
XY Falcon under side(similar to Mercury Comets 66-69 shot showing shock mounts pinion leaf spring front eyelets.
XY Falcon which is the same wheel arch as 68 Cometwithh RRS offset trailing arms and tubbed to the rails for wide tyres
the long torque arm creates a torque circuit imporving power transfer for improved launch
Upper coil over frame 1 68 Comet Watts linkage mounting frame for 67 Mercury Comet 2
RRS 3 link upper shock mount frame installed
Bolt on axle housing brackets  suits XR to XY
weld on axle housing brackets
66-69 Comet front seat bolt hole RRS cross member tab
66 67 68 69 Mercury Comet rear suspension front cross member
66-69 Mercury Comet off set trailing arms
multi position lower shock mount
66-69 Mercury Comet rear suspension upper coil over upper mount
66-69 Mercury Comet Watts linkage including in the RRS 3 link rear suspension upgrade
RRS 4 link alternative for 66 to 69 Mercury comets
RRS 3-link bolt-in rear suspension kit including axle housing and drum in disc rear brake upgrade for 66-69 Comet
XY Falcon under side(similar to Mercury Comets 66-69 shot showing shock mounts pinion leaf spring front eyelets.
XY Falcon which is the same wheel arch as 68 Cometwithh RRS offset trailing arms and tubbed to the rails for wide tyres
the long torque arm creates a torque circuit imporving power transfer for improved launch
Upper coil over frame 1 68 Comet Watts linkage mounting frame for 67 Mercury Comet 2
RRS 3 link upper shock mount frame installed
Bolt on axle housing brackets  suits XR to XY
weld on axle housing brackets
66-69 Comet front seat bolt hole RRS cross member tab
66 67 68 69 Mercury Comet rear suspension front cross member
66-69 Mercury Comet off set trailing arms
multi position lower shock mount
66-69 Mercury Comet rear suspension upper coil over upper mount
66-69 Mercury Comet Watts linkage including in the RRS 3 link rear suspension upgrade
RRS 4 link alternative for 66 to 69 Mercury comets
RRS 3-link bolt-in rear suspension kit including axle housing and drum in disc rear brake upgrade for 66-69 Comet
XY Falcon under side(similar to Mercury Comets 66-69 shot showing shock mounts pinion leaf spring front eyelets.
XY Falcon which is the same wheel arch as 68 Cometwithh RRS offset trailing arms and tubbed to the rails for wide tyres
the long torque arm creates a torque circuit imporving power transfer for improved launch
Upper coil over frame 1 68 Comet Watts linkage mounting frame for 67 Mercury Comet 2
RRS 3 link upper shock mount frame installed
Bolt on axle housing brackets  suits XR to XY
weld on axle housing brackets
66-69 Comet front seat bolt hole RRS cross member tab
66 67 68 69 Mercury Comet rear suspension front cross member
66-69 Mercury Comet off set trailing arms
multi position lower shock mount
66-69 Mercury Comet rear suspension upper coil over upper mount
66-69 Mercury Comet Watts linkage including in the RRS 3 link rear suspension upgrade
RRS 4 link alternative for 66 to 69 Mercury comets