Hellwig 3520 LP-35 Heavy Duty Leaf Kit 3500lbs 99-07 Ford F-250/F-350 Super Duty

Regular price: $455.22
Regular price: ~~$650.28~~
Sale price: $455.22

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In Stock: 14

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Product Specification:

SKU:HWG3520

MPN: 3520

UPC: 745662035204

Weight: 55.4 lb

Inventory: 14

Type: Leaf Springs & Accessories

Vehicle Fitment

1999-2007 Ford F-250 Super Duty (XL, XLT, Lariat, King Ranch, Harley-Davidson, Cabela's; 5.4L V8 Triton, 6.8L V10 Triton, 7.3L Power Stroke Diesel V8, 6.0L Power Stroke Diesel V8, 6.4L Power Stroke Diesel V8; 2WD/4WD; SRW and DRW)
1999-2007 Ford F-350 Super Duty (same trims/engines; 2WD/4WD; SRW and DRW)

Fitment Notes

Designed for the 2nd-generation Ford Super Duty (1999-2007 "old body," pre-2008 refresh).
Fits Regular Cab, SuperCab, and Crew Cab configurations; SRW and DRW body styles.
REQUIRES a separate LP Mounting Hardware Kit for installation - sold separately.
Will NOT fit trucks equipped with factory contact overload springs unless the factory overloads are first removed.
Standalone spring kit - universal LP-35 leaf pack; consult Hellwig fitment chart for the correct mounting kit.

Features

LP-35 Load Pro Heavy Duty - up to 3,500 lbs level-load capacity
4-leaf stack design offers the maximum carrying capacity in Hellwig's line
Progressive Spring Rate design activates only when factory springs compress under load
Fulltime Spring Rate design available - workhorse of the Hellwig line
Variable-rate leaves do not affect ride quality when the bed is empty
Built from heat-treated ASTM 5160 alloy spring steel for long service life
Raised height and spring rate adjust via U-bolts
Simple bolt-on installation with common hand tools - no drilling required
Proudly made in the USA (Visalia, CA) - limited lifetime warranty

Specifications

Product Line: Hellwig LP-35 Load Pro Heavy Duty
Maximum Safe Load: 3,500 lbs
Design: 4-leaf stack helper spring (progressive / fulltime rate)
Material: Heat-treated ASTM 5160 alloy spring steel
Finish: Silver Hammer Tone powder coat
Position: Rear (axle-mounted, sits on top of factory leaf springs)
Adjustable: Yes (via U-bolts)
Mounting Hardware: Sold separately (LP Mounting Kit required)
Drilling Required: No
Warranty: Limited lifetime

Included Components

2x LP-35 Helper Spring Leaf Packs (driver + passenger side)
1x Installation instructions
Note: LP Mounting Hardware Kit sold separately and required for installation

Product Description

The Hellwig 3520 LP-35 Heavy Duty Helper Spring Kit delivers up to 3,500 lbs of additional level-load capacity for 1999-2007 Ford F-250 and F-350 Super Duty trucks. Built from heat-treated ASTM 5160 alloy spring steel in a 4-leaf stack, these helper springs offer the maximum carrying capacity in Hellwig's lineup - engineered for fleet trucks, contractor rigs, and heavy haulers that work hard every day.

The Progressive Spring Rate design means the helper springs engage only when your factory springs compress under load, preserving ride quality when the bed is empty. Note that a separate LP Mounting Hardware Kit is required for installation - consult Hellwig's fitment chart to select the correct kit for your truck. Does not fit trucks with factory overload springs still installed. Proudly made in Visalia, California and backed by Hellwig's limited lifetime warranty.