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1977-1990 B-Body Caprice LS Conversion Kit


1977-1990 B-Body Caprice LS Conversion Kit
Purchase 1977-1990 B-Body Caprice LS Conversion Kit
  • 1977-1990 B-Body Caprice LS Conversion Kit

  • $529.00

    SKU: LSX27

  • Select Transmission:  

MuscleRods LS Swap Ready for 1977-90 Caprice & 1977-85 Impala

Optimize your LS swap in Caprice models built between 1977 and 1990 and Impala models built between 1977 and 1985 installations with precision welded US steel brackets and a custom crossmember that secures the correct drivetrain angle for a vibration free ride. Enjoy plug and play compatibility with 4L60E and 4L80E transmissions, no transmission tunnel modifications, high clearance or LH8 oil pan support, and the proven durability of MuscleRods US manufacturing.

Complete MuscleRods LS Engine Swap Kit for Caprice 1977-1990 and Impala 1977-1985

Swapping an LS powerplant into a B-Body Caprice or Impala often stalls when stock brackets fail to match the original frame geometry, and the 1977-1990 B-Body Caprice LS Conversion Kit delivers custom motor and transmission mounts that bolt directly to these frames without modifying the tunnel. This solution preserves the factory orientation for both engine and transmission to maintain drivetrain alignment, cutting vibration and reducing chassis strain. Installers benefit from support for 4L60E and 4L80E transmissions along with the choice of a tall oil pan or LH8 design for optimal underbody clearance. Manufactured in the USA by MuscleRods from precision steel, every bracket and crossmember arrives ready for a bolt in swap and includes all required hardware for a straightforward fit.

Precision Alignment for LS Powertrain Integration

Preserving the factory engine and transmission angle on 1977 to 1990 B Body Caprice and 1977 to 1985 Impala frames is critical for driveline health. By matching the original orientation, universal joints operate in their optimal range of motion, preventing binding under torque and reducing vibration throughout the powertrain. This exact alignment limits stress on the chassis and suspension mounts, offering a smoother ride and more predictable handling under load. Installers no longer need to guess bracket placement or resort to trial fitting, as every mounting point is engineered to the precise frame geometry of these classic models.

Polyurethane Mount System for Vibration Isolation

Replacing standard rubber components with a durable polyurethane transmission mount and spacer assembly delivers a significant improvement in both longevity and noise control. Polyurethane resists degradation from oil, coolant, and road contaminants, so it retains its shape and support over thousands of miles. During hard acceleration or spirited driving the transmission remains firmly in place, yet transient harshness is still absorbed before it can transfer into the passenger cabin. Over time this material choice prevents sagging or flattening, ensuring consistent isolation and minimizing drivetrain chatter through repeated cycles.

Adjustable Oil Pan Compatibility for Underbody Clearance

The conversion kit's crossmember and frame brackets are designed to accept either a tall clearance oil pan or the LH8 style without any tunnel trimming. Builders can tailor ground clearance and sump volume to suit street or track applications by simply choosing the appropriate pan. This flexibility ensures that suspension travel, steering travel, and frame rail height remain uncompromised, even on lowered vehicles or those running aftermarket geometry. The result is a customized balance of oil capacity and vehicle ride height secured without cutting, welding, or guesswork during installation.

American Made Steel Brackets for Consistent Fitment

Each motor mount, frame bracket, and crossmember is manufactured in the USA from precision laser cut steel plate to exacting tolerances. By maintaining strict quality control at every stage of production, the kit delivers a repeatable, true bolt in installation with no need for trial fitting or modification of the transmission tunnel. All necessary fasteners and hardware are included in the package, so installers avoid multiple trips to the parts store and can complete the swap in a single build session. This domestic manufacturing approach ensures reliable performance and longevity under demanding use.

Count on MuscleRods for precise fit and consistent performance. To access a more robust kit where you can build this same kit but this is a customizable kit where the user can select their own parts to better suit their needs see our Complete LS Swap Kits - LS Kit Builder.

Fitment

  • Caprice 1977-1990
  • Impala 1977-1985

Specifications

  • SKU: LSX27
  • Swap Engine: LS
  • Body Type: B-Body
  • Brand: Muscle Rods
  • Compatible Engine Models: Most Gen III/IV LS Engines (e.g., LS1, LS2, LS3, 5.3L, 6.0L) when used with a compatible High Clearance Oil Pan or Cast Aluminum Retro LS Oil Pan.
  • Compatible Transmissions: 4L60E, 4L80E (without tunnel modifications); Fitment for other transmissions may require modifications.
  • What's Included:
    • (2) Motor Mounts
    • (2) Frame Brackets
    • (1) Transmission Crossmember
    • (2) Crossmember Brackets
    • (1) Driver-side Secondary Z Bracket
    • (1) Polyurethane Transmission Mount and Spacers
    • (1) Installation Hardware Pack

Key Features

  • Supports 1977-1990 B-Body Caprice and Impala models
  • Maintains correct drivetrain angle to reduce vibrations and improve ride stability
  • Compatible with 4L60E and 4L80E transmissions
  • Requires no transmission tunnel modifications for installation
  • Versatile oil pan compatibility (High Clearance or LH8)
  • Proudly designed and manufactured in the USA

Benefits

  • Ensures direct fit for '77-90 Caprice and Impala upgrades
  • Delivers a vibration-free drive for smoother ride comfort
  • Lets you retain or install popular 4L60E/4L80E transmissions
  • Simplifies installation without cutting or modifying the transmission tunnel
  • Adapts to high-clearance or LH8 pans for custom ground clearance
  • Offers superior US-built quality for lasting durability and reliability

This Item Assigned to Category and Also Fits:

Description

Complete MuscleRods LS Engine Swap Kit for Caprice 1977-1990 and Impala 1977-1985

Swapping an LS powerplant into a B-Body Caprice or Impala often stalls when stock brackets fail to match the original frame geometry, and the 1977-1990 B-Body Caprice LS Conversion Kit delivers custom motor and transmission mounts that bolt directly to these frames without modifying the tunnel. This solution preserves the factory orientation for both engine and transmission to maintain drivetrain alignment, cutting vibration and reducing chassis strain. Installers benefit from support for 4L60E and 4L80E transmissions along with the choice of a tall oil pan or LH8 design for optimal underbody clearance. Manufactured in the USA by MuscleRods from precision steel, every bracket and crossmember arrives ready for a bolt in swap and includes all required hardware for a straightforward fit.

Precision Alignment for LS Powertrain Integration

Preserving the factory engine and transmission angle on 1977 to 1990 B Body Caprice and 1977 to 1985 Impala frames is critical for driveline health. By matching the original orientation, universal joints operate in their optimal range of motion, preventing binding under torque and reducing vibration throughout the powertrain. This exact alignment limits stress on the chassis and suspension mounts, offering a smoother ride and more predictable handling under load. Installers no longer need to guess bracket placement or resort to trial fitting, as every mounting point is engineered to the precise frame geometry of these classic models.

Polyurethane Mount System for Vibration Isolation

Replacing standard rubber components with a durable polyurethane transmission mount and spacer assembly delivers a significant improvement in both longevity and noise control. Polyurethane resists degradation from oil, coolant, and road contaminants, so it retains its shape and support over thousands of miles. During hard acceleration or spirited driving the transmission remains firmly in place, yet transient harshness is still absorbed before it can transfer into the passenger cabin. Over time this material choice prevents sagging or flattening, ensuring consistent isolation and minimizing drivetrain chatter through repeated cycles.

Adjustable Oil Pan Compatibility for Underbody Clearance

The conversion kit's crossmember and frame brackets are designed to accept either a tall clearance oil pan or the LH8 style without any tunnel trimming. Builders can tailor ground clearance and sump volume to suit street or track applications by simply choosing the appropriate pan. This flexibility ensures that suspension travel, steering travel, and frame rail height remain uncompromised, even on lowered vehicles or those running aftermarket geometry. The result is a customized balance of oil capacity and vehicle ride height secured without cutting, welding, or guesswork during installation.

American Made Steel Brackets for Consistent Fitment

Each motor mount, frame bracket, and crossmember is manufactured in the USA from precision laser cut steel plate to exacting tolerances. By maintaining strict quality control at every stage of production, the kit delivers a repeatable, true bolt in installation with no need for trial fitting or modification of the transmission tunnel. All necessary fasteners and hardware are included in the package, so installers avoid multiple trips to the parts store and can complete the swap in a single build session. This domestic manufacturing approach ensures reliable performance and longevity under demanding use.

Count on MuscleRods for precise fit and consistent performance. To access a more robust kit where you can build this same kit but this is a customizable kit where the user can select their own parts to better suit their needs see our Complete LS Swap Kits - LS Kit Builder.

Fitment

Fitment

  • Caprice 1977-1990
  • Impala 1977-1985
  • Compatible Transmissions: 4L60E, 4L80E (without tunnel modifications); Fitment for other transmissions may require modifications.
Features
  • Supports 1977-1990 B-Body Caprice and Impala models
  • Maintains correct drivetrain angle to reduce vibrations and improve ride stability
  • Compatible with 4L60E and 4L80E transmissions
  • Requires no transmission tunnel modifications for installation
  • Versatile oil pan compatibility (High Clearance or LH8)
  • Proudly designed and manufactured in the USA
Benefits
  • Ensures direct fit for '77-90 Caprice and Impala upgrades
  • Delivers a vibration-free drive for smoother ride comfort
  • Lets you retain or install popular 4L60E/4L80E transmissions
  • Simplifies installation without cutting or modifying the transmission tunnel
  • Adapts to high-clearance or LH8 pans for custom ground clearance
  • Offers superior US-built quality for lasting durability and reliability
What's Included
  • (2) Motor Mounts
  • (2) Frame Brackets
  • (1) Transmission Crossmember
  • (2) Crossmember Brackets
  • (1) Driver-side Secondary Z Bracket
  • (1) Polyurethane Transmission Mount and Spacers
  • (1) Installation Hardware Pack
Specifications
  • SKU: LSX27
  • Brand: Muscle Rods
  • Swap Engine: LS
  • Body Type: B-Body