Independent Rear Suspension

[Pages:31]Controlled Documentation

Part Number: 12449 Revision: K Effective Date: 11/27/12

Document Type (indicate):

Bill of Materials

Drawing (may be attached)

Assembly Instructions Operating Procedure

By: J. INGERSLEV

Specification

Other

Independent Rear Suspension

Installation Instructions

PARTS INCLUDED IN KIT..........................................................................................................................................................2 THUNDERBIRD PARTS NEEDED.................................................................................................................................................4

Vehicles .............................................................................................................................................................................4 Parts needed.......................................................................................................................................................................4 NON-THUNDERBIRD PARTS NEEDED........................................................................................................................................5 TOOLS NEEDED ......................................................................................................................................................................6 SUPPLIES NEEDED ...................................................................................................................................................................6 SELECTION AND DISASSEMBLY OF THE THUNDERBIRD DONOR ..................................................................................................6 MASTER CYLINDER SELECTION CHART....................................................................................................................................8 MODIFICATION OF IRS PARTS ..................................................................................................................................................8 Spindles .............................................................................................................................................................................8 Rotors ................................................................................................................................................................................9 CV Joints ? If complete axles are not supplied .................................................................................................................10 Brake Calipers/Lines........................................................................................................................................................12 BOLT-ON PARTS...................................................................................................................................................................14 IRS Center Section...........................................................................................................................................................14 Lower Control Arms ........................................................................................................................................................16 IRS Rear Coil-Over Shock Assembly ...............................................................................................................................17 CV Axles .........................................................................................................................................................................22 Spindles ...........................................................................................................................................................................22 Upper Control arms .........................................................................................................................................................23 Quad shock Installation....................................................................................................................................................24 Rear Calipers and Rotors..................................................................................................................................................25 Emergency Brake Cable Installation.................................................................................................................................25 Fuel line Installation ........................................................................................................................................................26 Width Adjustment............................................................................................................................................................26 FINAL ASSEMBLY ..................................................................................................................................................................28 Alignment specs...............................................................................................................................................................29 Torque specs ....................................................................................................................................................................29 AFTERMARKET PARTS AVAILABILITY .....................................................................................................................................29 OLDER CHASSIS RETROFIT ....................................................................................................................................................29 FFR Chassis preparation ..................................................................................................................................................29 Upper cage Assembly.......................................................................................................................................................30 Lower Cage Assembly......................................................................................................................................................30

These instructions are designed to supplement the Assembly manual where the assembly process is different from the build-up using a solid axle. Sections of the manual that deal with the assembly of the rear end will

DO NOT DUPLICATE CONFIDENTIAL INFORMATION AND PROTECTED UNDER U.S. COPYRIGHT LAWS 2012 FACTORY FIVE RACING, INC.

Server/company/instructions

not apply and can be skipped. Read through these instructions before beginning assembly as some of the changes occur early in the build-up process. Using the Factory Five Racing Independent Rear Suspension will require a conversion to 5 lug which, if you are not currently using 5 lug will require new wheels. If you need 11" 5 Lug rotors for the front then use `82-'83 Lincoln Continental or '91 Lincoln Mark VII LSC or Ford Racing Performance Parts # M-1102-C.

Parts Included in Kit

14769 12446 12449 14852 11138 12452 15508 14690 12409 15388 10970 10984 12400 11027 13976 15383 14680 14622 25621 25622 25623 25961 14700 14681 33238 15388 12385 10834 13976 12386 12268 13337 12348 12380 12384 15216 12428

BOX 11 C IRS COMPONENTS BOX, PRE-PRINTED, ROLLBAR IRS INSTRUCTIONS REAR WHEEL STUDS HOSE CLAMP, 5/16" FUEL LINE FLEXIBLE FUEL LINE, 5/16" ID, HIGH PRESSURE, 24" STANDARD WIDTH CV AXLE EMERGENCY BRAKE CABLES BRAKE LINE ADAPTER 0.43" SPACER 1/4" INSULATED CLIP #14 x 1/2" SCREW QUAD SHOCK BOLT QUAD SHOCK LOCKNUT 1/2" WASHER HARDWARE BOX KONI STANDARD IRS SHOCK SET WITH KIT KONI SHOCK, (30-1720) SPRING HAT SPRING COLLAR COIL-OVER THREADED SLEEVE SPRING, FRONT COIL-OVER, BLACK, 2.5" ID, 8", 750# IRS KONI COIL-OVER INSTRUCTIONS IRS SHOCK MOUNTING COMPONENTS 1.09" SPACER 0.43" SPACER 1/2"-13 x 2.5" BOLT 1/2"-13 NYLON LOCK NUT 1/2" WASHER 1/2"-13 x 3.25" BOLT IRS LOWER REAR CONTROL ARM COMPONENTS ROD END SPACER ROD END, RIGHT HAND THREAD JAM NUT 5/8"-11 x 2.50" BOLT 5/8"-11 LOCK-NUT DRIVER SIDE IRS LOWER CONTROL ARM

EA 1.00 EA 1.00 EA 1.00 EA 10.00 EA 2.00 FT 2.00 EA 2.00 EA 2.00 EA 3.00 EA 4.00 EA 45.00 EA 10.00 EA 4.00 EA 4.00 EA 6.00 EA 1.00 EA 1.00 EA 2.00 EA 2.00 EA 2.00 EA 2.00 EA 2.00 EA 1.00

EA 2.00 EA 6.00 EA 2.00 EA 4.00 EA 4.00 EA 2.00 EA 1.00 EA 36.00 EA 4.00 EA 4.00 EA 4.00 EA 4.00 EA 1.00

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12429 12440 33239 12348 12380 12382 15216 12387 12367 12438 12386 10834 10833 10834 12327 12439 12375

PASSENGER SIDE IRS LOWER CONTROL ARM IRS UPPER REAR CONTROL ARM COMPONENTS ROD END SPACER, 0.375" ROD END, RIGHT HAND THREAD JAM NUT 5/8"-11 x 3" BOLT 5/8"-11 LOCK-NUT WASHER, UPPER ARM TO CAGE IRS UPPER REAR CONTROL ARM IRS CAGE COMPONENTS 1/2"-13 x 3.25" BOLT 1/2"-13 NYLON LOCK NUT 1/2"-13 x 1.25" BOLT 1/2"-13 NYLON LOCK NUT CAGE IRS UPPER CAGE UPPER CAGE

EA 1.00 EA 1.00 EA 4.00 EA 2.00 EA 2.00 EA 2.00 EA 2.00 EA 4.00 EA 2.00 EA 1.00 EA 2.00 EA 2.00 EA 2.00 EA 2.00 EA 1.00 EA 1.00 EA 1.00

Lower arms and Cage (Cage separate from frame)

Upper arms and Cage (Cage separate from frame)

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Thunderbird Parts needed

Vehicles For all applications make sure that the diameter of the axle shafts at the splined ends measure 1.2 inches, the differential has 8.8 cast into its top, and that rear disc brakes are present on the donor IRS. To determine the gear ratio, and whether or not the unit has posi-traction, look at the tag that is attached to one of the differential cover bolts. The first 4 spaces signify the gear ratio and whether or not it has posi-traction. If the unit has posi-traction, then the second space will have an L in it representing (limited slip), the remaining spaces specify the gear ratio. For example, 2 L 7 3 means posi-traction with a 2.73:1 gear ratio. Most people pay a salvage yard between $300-$400 for the donor parts. Also, Ford Racing Performance Parts sells a 15lb. lighter aluminum carrier with 3.73 gears and posi-traction for around $650. 1989-1997 Thunderbird Supercoupe (All Posi-traction) 1992-1997 Thunderbird V-8 models with rear disc brakes(some posi-traction) 1992-1997 Lincoln Mark VIII (All aluminum carrier, most non-posi-traction) 1989-1992 Mercury Cougar XR-7, supercharged V-6 (All posi-traction) 1993-1997 Mercury Cougar V-8 with rear disc brakes (some posi-traction), after 94 all Cougars were called XR-7's Parts needed 8.8" carrier, front mounting bushings, and rear mounting hardware. Spindles and attaching hardware.

Disc brakes with flexible brake lines and mounting brackets.

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Donor fasteners needed: (Upper) Spindle attaching bolts. (Lower left) Center Section front mounts. (Lower right) Center Section rear mount bolts.

NON-Thunderbird parts needed

Mustang Quad shocks ?Aftermarket KYB shocks usually interfere with tires. ?" Lug nuts (T-bird lug nuts are metric)

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Tools Needed

Drill 3/16" drill Bit 3/8", ?", 15/16" sockets 3/8", ?", 15/16" wrenches 3/8"-7/16" Brake line box wrench Brake line double flare tool Brake line cutter Brake line bender Ruler/Tape measure Snap ring pliers Pliers Flat head Screwdriver Tin Snips/scissors/razor Marker

Supplies needed

3.25 pints Gear oil 4 oz. Friction Modifier Brake Fluid Rear brake pads

Selection and Disassembly of the Thunderbird Donor

When selecting a donor vehicle, there are several important things to look for to avoid problems. Ford used the same IRS set-up for a few different cars. Thunderbirds between 1989 and 1997, Lincoln Mark VIII's between 1992 and 1999, and Mercury Cougar XR7's between 1989 and 1992. Only some of the cars have the correct parts that are needed. The points to check are as follows:

The first and most important item to check when looking at different rear ends is the diameter of the CV shafts. The V6 and some V8 cars came equipped with a smaller diameter CV shaft. These CV joints will not work with the new shorter shafts provided or with the Torque that can be made from a 5.0L HO engine so they should be avoided. To check for the proper shaft size, check the diameter of either side. The correct diameter is 1.2 inches, next to the splines. If you are using a Super Coupe, the axles will be correct even if the passenger side is considerably thicker. Under the boots, it necks down to the correct size. Check the center section. What you need is an 8.8 inch unit. It will have 8.8 cast into the top of the differential and is noticeably larger than the 7.5 inch center that was also used. Lincoln Mark VIII came with aluminum center sections that are 15lbs lighter than the iron one. The Thunderbirds were available with and without rear disc brakes. We recommend one with the discs (free upgrade from a drum brake solid axle).

When you find a rear you like just ask for the whole rear clip from the car. The whole thing unbolts with four bolts and they usually cut the driveshaft. This way you will be sure to get everything that you need. Limited slip (Posi-traction/Traction-Lok) and Open Differentials

Early Mark VIII center sections do not have a limited slip differential.

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 The Thunderbird Supercoupe does have a limited slip differential. The IRS is an 8.8 center section and it can use the same gears that the solid axle 8.8 from the

Mustang uses but, it can not use the same differentials. The IRS differential has a step cut in the side gears to hold the CV joints in the center section. Without this step there is nothing holding the axles from coming out.

There are only three differentials that will work in either the Mark VIII or T-bird center section, the stock Supercoupe traction-Lok, an Auburn Gear differential and a Torsen differential. Auburn offers two units that will work. The high performance unit (part # 542079) for standard OE replacement(~$250), and the pro series unit (part # 542080) for better traction and faster engagement (~$350). The Torsen, sold by Ford Motorsport is the best differential around and is used by many performance car companies (Porsche) as standard equipment. It is all gears inside and never wears out. It isn't designed for a life of drag racing though, its designed for roadracing. The Ford Motorsport part number is M-4204-T28 (~$500).

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Parts can be bought new if desired from Factory Five Racing.

Master Cylinder Selection Chart

Front Calipers

Lincoln Continental/Mark VII Cobra Mustang Stock Mustang

MC Bore Diameter

1"

MC Source Vehicle 1993 Mustang Cobra

Part Source Ford, Parts Store

15/16" 7/8"

1994 Mustang Cobra Ford 1982 4 cyl. Mustang Parts Store

Part Number Bendix# 12669 Bendix# 11764

Modification of IRS parts

Do not throw away any parts from the IRS until the IRS is installed and the axles have been changed.

Spindles

The Thunderbird uses a 5 lug x 4.25" Lug pattern. This is not very helpful since the Mustang uses either a 4 lug x 4.25" pattern or a 5 lug x 4.5" pattern. Unless you want a different lug pattern on your rear, the hubs will have to be drilled to the 5 lug x 4.5" pattern. We would recommend that a machine shop do this, as the measurements need to be precise otherwise your wheels will not fit. We had a shop do both hubs for $100. The machine shop will press the hubs out of the bearings and press the wheel studs out of the hubs. We have included new ?"studs so that the front and rear lug nuts are the same and are good and strong. The Thunderbird used metric studs and lugs.

When you get the spindles back, check the hubs for slop in the bearings. There should be none. If

there is, have the shop replace the bearings. Check the new bolt pattern in a wheel to make sure that it will go on.

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