Size Chart
×
UMI Performance 78-88 GM G-Body Modular Adjustable Transmission Crossmember - Red is UMI Performance manufacturer part number 3108-R, selected by the verified year, make, and model applications below. Introducing UMI's Cutting-Edge Modular Crossmember System: The Ultimate Transmission Mounting Solution for Your 1978-1988 GM G-Body Transform your GM G-body with UMI's state-of-the-art modular crossmember system Designed to deliver precision, performance, and versatility. Engineered with a laser-cut tab and slot design, this innovative solution offers multiple mounting locations, enabling you to fine-tune your driveline angle effortlessly. Our brace design provides plenty of space for large diameter dual exhausts, ensuring seamless installation and optimal functionality. Whether you're upgrading or maintaining your vehicle, our system accommodates various transmission models with ease. Total Brace Weight: 22 lbs. Optional Transmission Mount: Most applications use 3.1158 (short mount), but
Key Features
Fitment
| Years | Make | Model | Application Notes |
|---|---|---|---|
| 1978-1987 | Buick | Regal | Confirm every UMI Performance application note and factory configuration |
| 1978-1987 | Chevrolet | El Camino | Confirm every UMI Performance application note and factory configuration |
| 1978-1983 | Chevrolet | Malibu | Confirm every UMI Performance application note and factory configuration |
| 1978-1988 | Chevrolet | Monte Carlo | Confirm every UMI Performance application note and factory configuration |
| 1978-1987 | GMC | Caballero | Confirm every UMI Performance application note and factory configuration |
| 1981-1988 | Oldsmobile | Cutlass | Confirm every UMI Performance application note and factory configuration |
| 1982-1986 | Pontiac | Bonneville | Confirm every UMI Performance application note and factory configuration |
| 1978-1987 | Pontiac | Grand Prix | Confirm every UMI Performance application note and factory configuration |
Specifications
| Brand | UMI Performance |
|---|---|
| Manufacturer Part Number | 3108-R |
| Product Type | Crossmembers |
| Application Type | Vehicle Specific |
| Condition | New |
What's Included
One new UMI Performance crossmembers package identified by manufacturer part number 3108-R, plus only the hardware and accessories expressly shown or stated for this exact part number
About UMI Performance
UMI Performance designs and manufactures suspension, chassis, steering, and handling components for American performance vehicles in Philipsburg, Pennsylvania.
Related UMI Performance Products
Frequently Asked Questions
How do I confirm UMI Performance 3108-R is correct for my application?
Match the exact manufacturer part number, year, make, model, factory configuration, dimensions, connection points, and every current UMI Performance note.
Are similar UMI Performance parts interchangeable with 3108-R?
No. Mounting points, dimensions, adjustment range, material, finish, bushing style, and included hardware can differ between part numbers.
What should be checked after installing UMI Performance 3108-R?
Inspect fasteners, bushings, joints, clearances, alignment, ride height, and suspension movement after installation and again after the initial road test.
Installation
Follow the current UMI Performance instructions for manufacturer part number 3108-R. Confirm all torque values, mounting locations, bushings, joints, clearances, ride height, and alignment requirements. Professional installation and a post-installation alignment are recommended when the component changes suspension geometry.
Shop Buick Regal parts for brake service, chassis restoration and suspension projects at Black Ops Auto Works. Explore QA1, UMI and Ridetech choices for applicable classic G-body builds alongside service references for different Regal generations. Choose the exact version and equipment before comparing parts.Classic G-Body Suspension ChoicesCompare listed coilover systems, replacement shocks, sway bars and control arms for their full Regal applications. QA1, UMI and Ridetech packages have different contents and setup requirements. Choose the intended ride height and use, then match springs, dampers and mounts as a coordinated combination.Brake Service and Conversion ProjectsDFC lists separate Regal caliper and hardware references. Baer Classic Series listings include stated 1978–1988 Regal conversion applications. Distinguish maintenance of the existing brakes from a conversion requiring compatible hubs, hydraulics and wheel clearance, then select the right axle and complete package...
View Buick Regal Parts and Accessories Products
Shop Chevrolet El Camino parts for a suspension refresh, brake upgrade or engine project at Black Ops Auto Works. Explore Ridetech, QA1 and UMI chassis choices alongside Baer or Wilwood brake kits and Edelbrock engine components. Build your order around the generation and equipment of your El Camino, from a restoration to a modified street project.Suspension Choices for Your BuildCompare complete Ridetech CoilOver systems with individual shocks, springs and control arms when planning ride height and chassis work. QA1 adjustable shock and coil-over references offer separate spring-rate choices, while UMI lists control arms and sway bars. Select the correct A-body or G-body application, then compare adjustment, included components and the installation plan.Brake Service or a Larger Brake ProjectBaer Classic and SS4+ references and Wilwood front kits provide distinct kit sizes and applications. Compare the complete assembly, wheel-clearance requirements and supplied hardware before cho...
View Chevrolet El Camino Parts and Accessories Products
Shop Chevrolet Malibu parts for a chassis project, brake upgrade, engine build or selected body change at Black Ops Auto Works. Compare QA1, Ridetech and UMI suspension choices with Baer brake kits and Edelbrock engine components. Select your generation and installed equipment first: classic A-body or G-body parts and later sedan applications have separate coverage.Suspension Systems and Individual Chassis PartsQA1 references distinguish handling packages, coil-over systems and individual adjustable shocks, including kits supplied with or without particular components. Ridetech CoilOver and StrongArm references and UMI springs, sway bars and arms provide separate project paths. Compare adjustment, ride height and complete contents for the exact chassis before choosing a coordinated system or targeted replacement.Brake Kits and Routine ServiceBaer Classic references name specific G-body front and rear applications with different rotor sizes. Compare mounting, wheel clearance and inst...
View Chevrolet Malibu Parts and Accessories Products
Shop Chevrolet Monte Carlo parts for a suspension project, brake upgrade or engine build at Black Ops Auto Works. Compare Ridetech CoilOver systems, QA1 handling choices and UMI chassis components with Baer or Wilwood brake kits. Start with your generation and installed drivetrain to choose parts for the Monte Carlo you are building.Coil-Overs, Handling Packages and Chassis PiecesRidetech references include complete G-body CoilOver systems, rear StrongArms, springs and steering components. QA1 packages and individual shocks and UMI sway bars or springs serve separate scopes. Compare a complete chassis plan with a targeted replacement, reviewing generation, adjustment, ride height and exactly what each package supplies.Brake Upgrades and Service ComponentsBaer references distinguish G-body Classic kits and separate A-body kit sizes, while Wilwood lists another front-kit arrangement. Match mounting and wheel-clearance requirements before selecting a conversion. DFC calipers, shoes, ho...
View Chevrolet Monte Carlo Parts and Accessories Products
Transmission crossmembers and tubular K-members are stocked at Black Ops Auto Works for the platforms shown in each product listing. Shop transmission crossmembers, tubular K-members, engine mount kits, torque arm relocation kits, Mustang K-members, Camaro K-members, C10 engine mounts, G-Body transmission crossmembers, Jeep frame crossmembers and chassis mount hardware for Ford Mustang, GM F-Body and G-Body, Chevrolet C10, Jeep CJ and Willys, plus selected engine-swap builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 21 Crossmembers SKUs across transmission support, front suspension geometry, engine mounting, torque arm location, and chassis platform. What Crossmembers Cover Structural and Driveline Support Crossmembers support major vehicle systems across the chassis. The current selection includes transmission crossmembers, tubular K-members, engine mount kits and torque...
View Crossmembers Products
Drivetrain parts for high-horsepower Mopar, truck, Jeep, and import platforms are stocked at Black Ops Auto Works. Shop differentials, axles, driveshafts, clutch kits, flywheels, flexplates, shifters, transmission components, ring and pinion gears, differential braces, and driveline hardware for Hellcat, Trackhawk, TRX, HEMI, LS, LT, Coyote, and turbocharged import platforms. Every drivetrain part is filterable by vehicle platform, drivetrain layout, transmission type, and power level so the correct part ships the first time. Black Ops Auto Works carries 4,765 drivetrain SKUs across differentials, axles, clutches, and transmission hardware. What This Category Covers The drivetrain transfers power from the engine to the wheels and includes the transmission, clutch, driveshafts, axles, differentials, ring and pinion gears, wheel hubs, wheel bearings, U-joints, shifters, mounts, and bushings. Upgrading these components improves power delivery, durability, and reliability under incr...
View Drivetrain Products
Explore GMC Caballero parts for chassis projects, engine work and brake service at Black Ops Auto Works. Compare QA1 coilover and handling references with UMI or Ridetech arms and sway bars. Plan the order around the exact Caballero chassis and installed drivetrain.Coilovers, Arms and Handling PackagesQA1 titles distinguish front/rear systems, spring rates and single/double-adjustable configurations. UMI and Ridetech references include sway bars, trailing arms, mounts and crossmembers for stated G-Body applications. Require complete Caballero body/chassis support and review the whole suspension combination. A loose spring, bracket or arm kit is a separate purchase from a complete handling package.Engine and Transmission ProjectsEdelbrock induction references and COMP Cams valvetrain parts require actual engine, head, intake and clearance review. Cometic gaskets and fasteners need correct dimensions and interfaces. FTI converter choices distinguish transmissions, lock-up arrangements...
View GMC Caballero Parts and Accessories Products
Shop Oldsmobile Cutlass parts for suspension projects, brake upgrades and maintenance at Black Ops Auto Works. Compare QA1, Ridetech and UMI chassis options, Baer or Wilwood brake references and engine or driveline components. Build the order around your exact Cutlass generation and the way you plan to use the car.QA1, Ridetech and UMI Suspension ChoicesThe selection includes A-body and G-body applications covering different production ranges, plus individual springs, control arms, sway bars and complete coil-over systems. Compare a focused spring or arm replacement with the contents of a coordinated handling package. Establish platform coverage first, then choose spring specifications, adjustment features and mounting components for the actual installation.Baer and Wilwood Brake ProjectsCompare Baer Classic, SS4+ or Pro+ kit references with applicable Wilwood choices after matching the vehicle and installed spindle or hub arrangement. Rotor diameter is one part of the decision; rev...
View Oldsmobile Cutlass Parts and Accessories Products
Shop Pontiac Bonneville parts for suspension improvements, brake repairs and driveline projects. Compare QA1 and UMI chassis references, Baer brake options, DFC service pieces and axle components by the work you want to complete. Bonneville applications vary, so choose from the exact year and platform coverage in each listing.QA1 and UMI Chassis ChoicesThe selection includes adjustable rear control arms, sway bars and coil-over references for specified GM platforms. Choose a sway-bar project separately from a spring-and-damper conversion, and compare single- versus double-adjustable shock arrangements where listed. Confirm Bonneville platform coverage, mounts and required supporting hardware before planning a package.Brake Service and Conversion OptionsA DFC front drum reference explicitly names 1965–1970 Pontiac Bonneville applications. Baer Classic Series and other GM brake-kit references serve a different project from replacing a drum or service hardware. Review the exact spindle...
View Pontiac Bonneville Parts and Accessories Products
Explore Pontiac Grand Prix parts for a handling project, brake repair or driveline service. Compare QA1, UMI and Ridetech suspension references with brake packages and axle components. Choose by your Grand Prix’s year and platform so the project starts with parts intended for the actual car.Springs, Coil-Overs and Handling PackagesThe selection includes spring references, adjustable dampers, control arms and larger handling or coil-over packages. Choose a targeted replacement for one service need or compare a coordinated package for a broader chassis project. Check the exact GM platform, intended ride height, spring specification and package contents; some handling kits explicitly exclude shocks.Steering and Brake ChoicesRidetech steering-linkage, tie-rod and spindle references serve different installation scopes from a simple bushing repair. Baer and Wilwood brake references also require the correct spindle, hub, hydraulic arrangement and wheel clearance. Choose components as a com...
View Pontiac Grand Prix Parts and Accessories Products
Transmission and drivetrain hardware for manual and automatic platforms are stocked at Black Ops Auto Works. Shop flywheels, flexplates, transmission crossmembers, mounts, coolers, valve bodies, shifters, shifter bushings, release bearings, slave cylinders, U-joints, and transmission rebuild kits for Subaru WRX and STI, Dodge Cummins diesel, GM G-Body and F-Body, BMW B58 and S58, Nissan 350Z, and Toyota GR Corolla platforms. Every part is filterable by year, make, model, and transmission type so builders can confirm the correct fitment before ordering. Black Ops Auto Works carries 1,322 transmission and drivetrain SKUs. What This Category Covers This collection spans the hardware that connects the engine to the drivetrain and manages gear selection, including flywheels, flexplates, transmission crossmembers, bell housings, transmission mounts, pans, coolers, filters, valve bodies, transmission internals, shifters, shifter bushings and cables, release bearings, slave cylinders, U...
View Transmissions Products
Shop UMI Performance suspension and chassis parts at Black Ops Auto Works. Compare control arms, sway bars, panhard or Watts-link references, braces and spring configurations across stated GM and Ford applications. Plan each order for the actual chassis, drivetrain and intended street or competition project.Control Arms and Chassis GeometryReferences distinguish adjustable and non-adjustable arms, front or rear positions and specific platform ranges. Street, road-race and drag titles have separate configurations and intended-use requirements. Match exact chassis and mounting coverage before comparing adjustment arrangements or bushing choices.Sway Bars, Springs and BracingUMI references include front or rear sway bars, spring sets and different frame or tower braces. Select the supported platform and current suspension configuration, then review full contents and installation requirements. A spring pair, spacer mount or shock bracket is a separate component from a complete suspensio...
View UMI Performance Products