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About DOI

DeFelice Offroad Innovations specializes in the design and manufacture of aftermarket products for all types of off road vehicles. Our product catalog includes bumpers, winch mounts, rock rails and skid plates for Hummers, Jeeps, Toyotas, Fords, Chevys, motorcycles and more.

Additionally we’re available for custom fabrication for all types of off-road vehicles. We have a complete machine shop and extensive knowledge in custom fabrication and vehicle mechanical modification. We have been building quality products for the offroad industry since 2001.

Four Wheeler Magazine’s Shop Profile of DOI

Quality Hardware and Materials

Why do we insist on using Grade 8 hardware and DOM tubing? We’ll let the numbers speak for themselves.

Material Yield Strength, PSI*
ASTM Grade A-53 pipe 30, 000
1020 ERW tube 40, 000
1020 DOM 70, 000
4130 Cr-Mo 90,000
4340 Cr-Mo 120,000
Bolt Tensile Strength (Breaking Strength -lbs)
BoltDia(in) Grade 2 Grade 5 Grade 8
Coarse Fine Coarse Fine Coarse Fine
1/4 2350 2700 3800 4350 4750 5450
5/16 3900 4300 6300 6950 7850 8700
7/16 7850 8800 12800 14400 15900 17800
1/2 10500 11800 17000 19200 21300 24000
9/16 13500 15000 21800 24400 27300 30400
5/8 16700 18900 27100 30700 33900 38400
3/4 24700 27600 40100 44800 50100 56000

Standard Bolt Head Markings

What We Do

We can design, build and install:

  • Drive train
    • Engine
      • Swaps
      • Engine mounts
    • Transmission
      • Swaps
      • Modifications
    • Transfer Case
      • Low gears
      • Flip kits
      • Doublers
      • Twin stick
      • Swaps
    • Axle modifications
      • Cut and roll
      • Narrowing
      • Ring and pinions
      • Locking differentials
      • Limited slip differentials
      • Knuckle modifications and changes
      • Trusses and gussets
      • Disc brake conversions
      • Chromoly shafts
      • Long fields
  • Suspension
    • Spring over lifts
    • 4-link’s
    • Coils
    • Air bags
    • Hydraulic bump stops
    • Shackle reversal
    • Long arm
    • Custom designs
  • IFS-to-solid axle conversions (SAS)
  • 2x to 4x conversions
  • Steering
    • high steer
    • full hydraulic
    • hydraulic assist
  • Protection
    • Roll cages
    • Bumpers – plate, tube
    • Rocker guards
    • Body armor
    • Skid plates
  • Miscellaneous
    • Winches
    • Winch mounts
    • Hi-Lift Jacks, custom mounts
    • Frame repair and modification

Bring us your ideas and we’ll build it beyond your expectations!

Front drive-shaft angle problems?

We can cut and roll your axle to cure your steering and drive-line angle problems.
RTI ramp – we have a 30 degree ramp for extreme travel vehicles.
RTI = (Distance traveled up ramp) / Wheelbase X 1000

Sandblasting and Powder Coating available on most parts.

Do you like your bumpers but they look like dung? We can sandblast and powder-coat them. They will not only look like new but they will stay looking that way. If you don’t know anything about powder coating, it is FAR superior to paint. Don’t let anyone coat your parts without sandblasting first. The abuse our rigs take requires a maximum adhesion that can only be achieved by sandblasting the parts first.

Want Larger Tires? Will you need to change gears?

How to determine effective gear ratio:

Effective Gear Ratio = (Old Tire Diameter ÷ New Tire Diameter) x GEAR RATIO

Example: What would be your new effective gear ratio with a tire size change from 31″ to 33″ with 4.10 gears?

(31 ÷ 33) = 0.939
0.939 x 4.10= 3.852
New effective gear ratio = 3.852

Matthew DeFelice

Matt DeFelice. Write bio here.

Machinery List

DeFelice Offroad Innovations is a fully equiped machine shop and auto facility.

Lodge and Shipley Shear – 8 ft. 1/4

Ermak Press Break – 130 ton

Tree Vertical Mill 2UVR

Miluwauke #2 Horizontal Mill

Cincinnatti Hydro Shift #13 Lathe

DoAll Band Saw – 21 in. throat

Johnson Band Saw – Big

Supra Surface Grinder – 8″X18″

Hossfeld #2 Hydraulic Tube Bender – Custom D.O.I. fabricated arm for 90+ degree bends. Up to 2 in. dies.

Ooya Radial Drill – 15 in.  Column, 4 ft.  Arm

Hand Sheetmetal Roll – 4 foot

Clausing Drill Press

Jancy Belt Sander – 4 in.

Miller Syncrowave T.I.G. Welder

Miller 250X M.I.G. Welder – 32A spool gun

Miller 200 M.I.G. Welder

D.O.I. Welding Table – 5 ft. X 8 ft. X 2.250 in. Thick (Flat within 0.008 in.)

Thermal Dynamics Pacmaster 100XL Plasma Cutter

2 – Two post hydraulic frame lifts

AUTOCAD 2005 Software

Mac Powerbook G4

Pioneer 1970 tuner with Bose 201 Series 3 speakers for those long nights.

General Electric – Side by Side Refrigerator (with front load for easy access) sticker covered and full of bee….. beverages. Pictures of fridge coming soon!