4 Gear Portal | 74Weld Motorsports

THE 74WELD 4 GEAR RACE PORTAL

The 74Weld 4 Gear Race Portal is designed to handle 1000+HP big block power plants in today’s winning Ultra4 and Trophy Trucks. This is a no corners cut product designed specifically for race applications. We use the best materials available, produce these on high quality Hermle 5 axis machines, and take every extra step that is required to deliver the highest quality race product. This is not a product for your daily driver, but for those that want to push big power, run big tires, and push the AWD/4WD boundaries look no further than this race proven setup!

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4 GEAR RACE PORTAL

FEATURES

1.63 or 1.45 gear ratio

Custom Upright and Suspension Geometry

~5” CV lift on independent applications

Spidertrax Pro Series Unit Bearing Integration

Every threaded hole features a steel threaded insert

Every bolt is drilled for safety wire

Every bolt hole features a 17-4 heat treated insert

All bearing surfaces are cut post heat treat

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RECOMMENDED CONFIGURATIONS

When it comes to race cars there is no “one size fits all approach” All uprights are custom designed based on your geometry. For this reason every portal is slightly different. When you are ready to order contact us and we will provide you with a “builder model” you will then either design your own upright or have us design it based on your geometry points you provide. We then machine a custom upright designed specifically for you. Please note that you must choose either the 1.45 or 1.63 ratio and once you do you are married to it. You cannot switch ratios without ordering a whole new portal.

CUSTOM BRAKE PACKAGE OPTIONS

• UNIVERSAL PORTAL BOXES ACCEPT CUSTOM CALIPER MOUNTS

• MACHINED, BOLT-ON CALIPER MOUNTS FOR ALCON, BREMBO, WILWOOD, JAMAR AND R1 CONCEPTS

• CALIPER MOUNTS AND ROTOR HATS DESIGNED AND MACHINED TO FIT

1.63 & 1.45 GEAR RATIO OPTIONS

• OPTION OF EITHER 1.45 OR 1.63 GEAR REDUCTION PORTAL

• 4.68” – 4.96” GEAR SPREAD DEPENDING ON RATIO

• BOTH RATIOS DESIGNED, TESTED, AND PROVEN TO WITHSTAND 1000+ HP

CUSTOM UPRIGHT & SUSPENSION DESIGN

• ALL UPRIGHTS ARE DESIGNED SPECIFICALLY TO FIT CUSTOMER SUSPENSION GEOMETRY

• BUILDER FILES ALLOW YOU TO GRAPH SUSPENSION POINTS ONTO A BLANK PORTAL

• USING PROVIDED SUSPENSION POINTS, UPRIGHTS ARE DESIGNED BY CUSTOMER OR BY 74WELD IN COLLABORATION WITH CUSTOMER

SPIDERTRAX UNIT BEARING INTEGRATION

• SPIDERTRAX 56 SPLINE PRO SERIES UNIT BEARING INTEGRATION

• 40 SPLINE UPPER INPUT SHAFT MATES TO 934 CV

• FULL UNIT BEARING SERVICEABLITY WITHOUT HAVING TO SEPARATE PORTAL BOX HALVES

PARTS BREAKDOWN & CONFIGURATIONS

UPRIGHTFully machined 7075 aluminum knuckle. All pivot points feature 17-4 heat treated inserts.
PORTAL BOX6061 aluminum portal box
GEARS9310 hobbed and heat treated gears. Finish ground bearing surfaces after heat treat.
SHAFTS300M 40 spline upper input shaft with 934 CV flange
UNIT BEARINGSpidertrax 56 spline Pro Series unit bearing(6 on 6.5)
INTERNALSSKF bearings and rotary shaft seals
BRAKESBrake packages available for Alcon, Brembo, Wilwood Aero 6, Jamar, R1 Concepts

THE 74WELD 4 GEAR RACE PORTAL