UMI PERFORMANCE
UMI Performance 78-88 GM G-Body Spring/Shock Lowering Kit 1in Rear 450lb
SKU: U01C GBF450-1
Description
Part #: GBF450-1
UMI's lowering package consists of four Viking double adjustable shocks, a hybrid front coil over spring system and either 1 or 2 inch lowering Hotchkis rear springs. With moderately increased spring rates for improved handling, this kit allows you to adjust your cars altitude and attitude for maximum performance and a cool appearance. The hybrid front coil system features 0-3" front drop and is easy to adjust and lock in place. The 1 or 2 inch rear lowering allows you to knock the factory height down a bit or go the extra inch for the Pro-Tour look. Double adjustable Viking shocks feature 19 compression and 19 rebound settings. These independently adjustable settings allow you to change from street to strip to corner carving handling simply by turning the knobs. No tools required.
UMI's lowering kit includes Viking double adjustable shocks, 450lb front coil-overs, and 1" or 2" rear lowering springs. Bolt-in design allows tool-free tuning for street or drag applications, offering firm handling and adjustable stance.
Fitment
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Specifications
| Brand | UMI PERFORMANCE |
| Part Number | U01C GBF450-1 |
Videos
G-Body Coilover Install: Ultimate Handling Upgrade
Stiffen Up Your G-Body The Easy Way!
How to Adjust Viking Coilover Shocks: Tips for the Best Performance
Removing the Factory Suspension | G-Body Build Series | S1E2
G-Body Build Series | 1978 Cutlass Suspension Upgrade | S1E1
Stage 2 Handling kit: Rear Install | G-Body Build Series | S1E3
Installing the UMI front suspension on the Monte
Unboxing the suspension for the Monte Carlo. UMI GBF002-2-r 78-88 G-body stage 2 kit.
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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