Chevrolet GMC Helper Kits


Chevrolet / GMC 1/2 Ton Truck 2-Wheel Drive Truck

Front or Spring Master Master Kit Includes
Model Rear Kit Year Capty. Kit Type Width Kit No. Leaf Bracket U-Bolt Remarks
C10/1500, R10/1500 Rear Kit 1985-87 2600 1 2 1/2 510-205 504-205 503-2101 502-254 H12
C1500 except short bed w/extended cab Rear Kit 1988-98 2600 1 2 1/2
510-127
504-127 503-3119 502-215 H14
C1500 short bed w/extended cab Rear Kit 1988-98 2600 1 2 1/2 510-133 504-133 503-3119 502-215 H14
Silverado/Sierra 1500 Rear Kit 1999-07 N/A No heavy duty kit available. Try a Timbren kit or Air Lift to boost your
suspension.
Silverado/Sierra 1500HD Rear Kit 2002-14 N/A No heavy duty kit available. Try a Timbren kit or Air Lift to boost your
suspension.

Chevrolet / GMC 1/2 Ton Truck 4-Wheel Drive Truck

Front or Spring Master Master Kit Includes
Model Rear Kit Year Capty. Kit Type Width Kit No. Leaf Bracket U-Bolt Remarks
Blazer, Jimmy, Suburban Front Kit 1973-91 1000 6 2 3/4 510-402 Tapered extra leaf kit
Blazer, Jimmy, Suburban, K10/1500 pickup Front Kit 1967-72 800 6 2 1/2 510-384 Tapered extra leaf kit, use w/taper leaf front springs w/ std. eyes only.
K10/1500, V10/1500 Front Kit 1973-87 1000 6 2 3/4 510-402 Tapered extra leaf kit
K1500 Front Kit 1988-98 N/A Torsion bar front suspension
Suburban Front Kit 1992-03 N/A Torsion bar front suspension
K10/1500, V10/1500 Rear Kit 1985-87 2600 1 2 1/2 510-105 504-105 503-2101 502-254
K1500 Rear Kit 1988-98 2400 1 2 1/2
510-127A
504-127 503-2119 502-215 H15
Silverado/Sierra 1500 Rear Kit 1999-07 N/A No heavy duty kit available. Try a Timbren kit or Air Lift to boost your
suspension.
Silverado/Sierra 1500HD Rear Kit 2002-14 N/A No heavy duty kit available. Try a Timbren kit or Air Lift to boost your
suspension.

 

Chevrolet / GMC 1/2 Ton Van 2-Wheel Drive

Front or Spring Master Master Kit Includes
Model Rear Kit Year Capty. Kit Type Width Kit No. Leaf Bracket U-Bolt Remarks
Astro, Safari w/composite rear springs Rear Kit 1985-95 3400 3 AST-1700 AST-1 AST-2 Steel replacements for OEM composite springs.

 

Chevrolet / GMC 3/4 Ton Truck 2-Wheel Drive Truck

Front or Spring Master Master Kit Includes
Model Rear Kit Year Capty. Kit Type Width Kit No. Leaf Bracket U-Bolt Remarks
Front Kit See Timbren or Air Lift Kits
C20/2500, R20/2500 Rear Kit 1985-87 2600 1 2 1/2 510-105A 504-105 503-2101 502-250
C2500 under 8600 lbs. GVW Rear Kit 1988-00 2400 1 2 1/2 510-127 504-127 503-3119 502-215 H14, H18
C2500HD, 8600 lbs. GVW and over Rear Kit 1988-00 2400 1 2 1/2 510-129 504-129 503-2119 502-215 H15, H18
Silverado/Sierra Rear Kit 1999-07 N/A No heavy duty kit available. Try a Timbren kit or Air Lift to boost your
suspension. .
Silverado/Sierra 2500HD Rear Kit 2001-10 2600 4 2 1/2 510-149A 500-135 503-2120 502-215 Frame must be factory drilled for OE brackets.

Chevrolet / GMC 3/4 Ton Truck 4-Wheel Drive Truck

Front or Spring Master Master Kit Includes
Model Rear Kit Year Capty. Kit Type Width Kit No. Leaf Bracket U-Bolt Remarks
K20/2500 pickup & Suburban Front Kit 1967-72 800 6 2 1/2 510-384 Tapered extra leaf kit, use w/taper leaf front springs w/std. eyes only.
K20/2500, V20/2500 Front Kit 1973-87 1000 6 2 3/4 510-402 Tapered extra leaf kit
Suburban Front Kit 1973-91 1000 6 2 3/4
510-402
Tapered extra leaf kit
K20/2500, V20/2500 Rear Kit 1985-87 2400 1 2 1/2 510-105A 504-105 503-2101 502-250
K2500 Rear Kit 1988-00 2400 1 2 1/2 510-129 504-129 503-2119 502-215 H15, H18
Silverado/Sierra 2500 Rear Kit 1999-07 N/A No heavy duty kit available. Try a Timbren kit or Air Lift to boost your
suspension. standard duty section of this online catalog.
Silverado/Sierra 2500HD Rear Kit 2001-10 2600 4 2 1/2 510-149A 500-135 503-2120 502-215 Frame must be factory drilled for OE brackets.

Chevrolet / GMC 1 Ton Van & Motorhomes 2-Wheel Drive

Front or Spring Master Master Kit Includes
Model Rear Kit Year Capty. Kit Type Width Kit No. Leaf Bracket U-Bolt Remarks
C3500HD Front Kit 1991-03 1600 6 2 1/2 510-492 H1, Tapered extra leaf kit
All w/ Coil springs Front Kit See Super Duty Coils
P30/3500 except motorhome chassis w/ 4-wheel disc Rear Kit 1973-99 3200 4 2 1/2 510-143 504-143 503-2115 502-320 OEM style fixed bracket kit
P30/3500 cutaway motorhome only Rear Kit 1993-99 1980 6 510-937 Tapered extra leaf kit, used with four leaf taper rear springs only.

Chevrolet / GMC 1 Ton Truck 2-Wheel Drive Truck

Front or Spring Master Master Kit Includes
Model Rear Kit Year Capty. Kit Type Width Kit No. Leaf Bracket U-Bolt Remarks
C30/3500, R30/3500 (“R” body only) Rear Kit 1973-91 2800 1 2 1/2 510-107 504-107 503-2101 502-258 H2, H11, H12
C30/3500, R30/3500 (“R” body only) Rear Kit 1973-91 2900 4 2 1/2 510-119 500-119 503-2113 502-298 OEM style fixed bracket kit
C30/3500, R30/3500 (“R” body only) Rear Kit 1973-91 4200 4 2 1/2 510-141 504-141 503-2113 502-320 H1, 6 leaf helper, high arch
C30/3500, R30/3500 (“R” body only) Rear Kit 1973-91 4200 4 2 1/2 510-139 504-139 503-2113 502-320 H1, 6 leaf helper, low arch
C3500 DRW Rear Kit 1988-00 2600 4 2 1/2 510-135 500-135 503-2118 502-258 H4, H5
C3500 SRW Rear Kit 1988-00 2400 1 2 1/2 510-129 504-129 503-2119 502-215 H2, H5, H15
Silverado/Sierra 3500 Rear Kit 2001-10 2600 4 2 1/2 510-149A 500-135 503-2120 502-215 Frame must be factory drilled for OE brackets.

 

Chevrolet / GMC 1 Ton Truck 4-Wheel Drive Truck

Front or Spring Master Master Kit Includes
Model Rear Kit Year Capty. Kit Type Width Kit No. Leaf Bracket U-Bolt Remarks
K30/3500, V30/3500 (“V” body only) Front Kit 1977-91 1000 6 2 3/4 510-402A Tapered extra leaf kit
K30/3500, V30/3500 Rear Kit 1977-87 2800 1 2 1/2 510-107 504-107 503-2101 502-258 H11, H12
K30/3500, V30/3500 (“V” body only) Rear Kit 1977-91 2900 4 2 1/2 510-119 500-119 503-2113 502-298 OEM style fixed bracket kit
K30/3500, V30/3500 (“V” body only) Rear Kit 1977-91 4200 4 2 1/2 510-141 504-141 503-2113 502-320 H1, 6 leaf helper, high arch
K30/3500, V30/3500 (“V” body only) Rear Kit 1977-91 4200 4 2 1/2 510-139 504-139 503-2113 502-320 H1, 6 leaf helper, low arch
K3500 DRW Rear Kit 1988-00 2600 4 2 1/2 510-135 500-135 503-2118 502-258 H4, H5
K3500 SRW Rear Kit 1988-00 2400 1 2 1/2 510-129 504-129 503-2119 502-215 H2, H5, H15
Silverado/Sierra 3500 Rear Kit 2001-10 2600 4 2 1/2 510-149A 500-135 503-2120 502-215 Frame must be factory drilled for OE brackets.

 

  • H2 Only fits vehicles without OEM rear helper.
  •  H3 Heavy duty available.
  • H4 Use 510-135 to replace OEM single leaf helper.
  • H5 With 454 engine use 502-340 U-bolt kit.
  • H6 For trucks with 8 leaf or greater main spring use 534-25400 installation kit.
  • H7 502-344 U-bolts included in master kit. Depending on which OEM spacer block is used, other lengths may be required. Consult heavy duty U-bolt chart.
  • H8 The grossaxle weight rating (GAWR) for the front axle is listed on the vehicle certification label on the left door near the door latch.
  • H9 Replaces OEM single leaf helper.
  • H11 With OEM sway bar use 502-298 U-bolt kit.
  • H12 Relocation of tail pipe may be required.
  • H13 Will raise vehicle approximately 1”.
  • H14 Installation kit contains 3 clamp-on and 1 bolt-on adjustable brackets.
  • H15 Installation kit contains 2 clamp-on and 2 bolt-on adjustable brackets.
  • H18 With diesel or 454 engine use 502-256 U-bolt kit.