High Horsepower Transmissions - Factory Five Racing Mk3 Roadster Assembly Manual

block cars. For big block cars, #10 lines are recommended to prevent a drop in oil pressure.

High Horsepower Transmissions

Stock: T-5
The stock T-5 is good for the stock engine. If the engine is going to have some work done to it then an
upgrade to a heavy duty, Ford Motorsport "Z" T-5 is all that is needed. The only time an additional
change to a Tremec 3550 or TKO is needed is if a big block is used or racing slicks are used on a high
horsepower engine. One unique feature of the Tremec TKO is it allows the shifter to be relocated 8"
forward of the normal shifter location if a vertical shifter is desired verses a forward angled shifter.
Steering Rack
Stock: 15:1 ratio
Once the car is rolling either a 15:1 or a 20:1 rack will yield about the same effort feel. The 20:1 ratio
rack means the steering wheel will have to be turned more in corners. For those that like the easy power
steering type feel, switching to a manual 20:1 rack will make parking easy. For road racers and
autocrossers, use a 15:1 rack or some corners/cones will be really difficult. If changing to either a manual
15:1 or 20:1 rack, a universal joint with a different number of splines will be necessary in order to
connect the steering shaft to the steering rack.
There are three possible racks to choose from:
1. A manual 15:1
2. A manual 20:1
3. A 1982-93 Mustang manual rack.
The stock steering set-up uses rubber steering rack bushings. Changing to polyurethane steering rack
bushings reduces the amount of slop and provides better steering response. Factory Five offers a 15:1
manual rack and polyurethane bushings.
Bump Steer
The optional bump steer kit that we offer allows the adjustment/elimination of any bump-steer.
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