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UMI Performance Bolt-In Viking Rear Coilover Kits
Coilover Kit, Bolt-In Viking Rear Coilover Kit, Rear, Adjustable Valving, Twin-tube Shocks, Springs, Buick, Chevrolet, GMC, Oldsmobile, Pontiac, Kit
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Estimated Ship Date from Texas: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
4057-225
Part Type:
Product Line:
Summit Racing Part Number:
UPI-4057-225
Coilover Kit Position:
Rear
Adjustable Valving:
Yes
Number of Valving Selections:
361
Shocks Included:
Yes
Internal Design:
Twin-tube
Coilover Springs Included:
Yes
Spring Rate (lbs./in.):
225 lbs./in.
Suspension Height Adjustment:
2.0-3.0 in. lowered
Gas Charged:
No
Shock Body Finish:
Silver
Spring Finish:
Black
Crossmember Included:
No
Adjustable Mounting Bracket Included:
No
Hardware Included:
Yes
Welding Required:
No
Quantity:
Sold as a kit.
Notes:
Fits with factory GM axle housings only. Vehicles used for drag racing or running slicks require welding of bolted brackets.
UMI Performance Bolt-In Viking Rear Coilover Kits
UMI Performance bolt-in Viking rear coilover kits allow full ride height, spring rate, and damping adjustability. The double shear upper mount is a direct bolt-in and holds a true 2.5 in. diameter coilover spring. The FEA designed lower bracket bolts in using the standard shock mounting hole as well as an additional reinforcement hole. Drilling one 3/8 in. hole per side is required to complete installation. The coilover kits utilize Viking shocks that are 19-way adjustable in both compression and rebound to ensure the perfect setting for every application. Viking shocks are fully rebuildable. The 2.5 in. diameter coilover springs are available in 14 in. long, 110 lb. spring rate for drag use; 14 in. long, 125 lb. spring rate for street use; and 12 in. long, 150 lb. spring rate for autocross and road race applications. The coilover kits have been tested with 1.5 in. diameter UMI trailing arms, as well as UMI's 22mm sway bar and 32mm drag anti-roll bar. Fitment with other brand sway bars and larger diameter control arms is not guaranteed. Please contact UMI for additional information regarding fitment.
Key features:
* Brackets manufactured entirely from 3/16 in. mild steel
* Laser-cut brackets for consistency and a precise fit
* TIG-welded for superior strength and clean looks
* Powdercoated brackets for a long lasting finish
* Viking double-adjustable shocks offer 19 compression and 19 rebound adjustments
* 3 spring rate options, depending upon application
* Bolt-in design
* No welding required
* Spacers included for use with control arm relocation brackets
Applications
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