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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:  

Simplify Your 1977-1990 B-Body LS Build with MuscleRods

Achieve flawless LS integration in your B-Body Caprice or Impala with US steel brackets and a precision crossmember that lock in the correct drivetrain angle for a vibration-free drive, all without modifying the transmission tunnel. Compatible with 4L60E and 4L80E transmissions and designed for use with high clearance or LH8 oil pans, this Engine Swap Kit from MuscleRods delivers lasting reliability through American craftsmanship and ensures the custom ground clearance you need.

MuscleRods B-Body LS Engine Swap Kit for Caprice (1977-1990) and Impala (1977-1985)

Swapping an LS engine into a 1977 to 1990 Caprice or 1977 to 1985 Impala often stalls when stock brackets do not match the original frame geometry. The 1977 to 1990 B Body Caprice LS Conversion Kit delivers custom motor and transmission mounts that bolt directly to these frames with no tunnel modifications. By preserving the factory drivetrain angle, vibration is cut and chassis stress is reduced while retaining support for both 4L60E and 4L80E transmissions. Each bracket and crossmember is made in the USA by MuscleRods to precise dimensions so installers can move forward with confidence.

Precision Drivetrain Alignment for Caprice and Impala Frames

The kit preserves the factory engine and transmission angle on 1977–1990 Caprice and 1977–1985 Impala frames, which is vital for driveline health. By matching the original orientation, universal joints run smoothly and binding under load is prevented, reducing vibration and chassis stress. This alignment also limits torque steer and harsh feedback during acceleration, so drivers experience a more predictable response. Installers avoid the guesswork of custom bracket fabrication, achieving a seamless fit that protects steering and suspension components over the long term.

Polyurethane Transmission Mount for Reduced Vibration

Replacing factory rubber with a polyurethane mount and spacer assembly brings significant gains in durability and noise control. Polyurethane resists oil and fluid attack far better than conventional materials, so it retains its shape and stiffness even after extended use. During hard launches or spirited driving it holds the transmission firmly in place, yet still isolates harshness from the passenger compartment. Over time it exhibits far less sag and deterioration, ensuring consistent performance and reduced maintenance intervals.

Flexible Oil Pan Compatibility for Clearance Adjustment

Engineers designed the crossmember and frame brackets to accept either a tall clearance pan or an LH8 style design without interference. Builders can fine tune underbody space by choosing a high capacity sump for extended track sessions or a shallow system for lowered ride height on the street. This versatility lets you optimize ground clearance in line with suspension and steering geometry, without custom welding or grinding. The result is a tailored balance between oil capacity and undercarriage space that matches your project goals.

US Made Brackets and Crossmember for Reliable Installation

Every plate and bracket is laser cut and precision machined in the USA to strict dimensional standards, delivering a true bolt in installation with no transmission tunnel modifications. The heavy gauge steel components and crossmember work in concert to maintain exact frame geometry, so each swap repeats with the same fit every time. All required fasteners are included in the hardware pack, eliminating trips to the parts store and cutting overall build time. This domestic production approach ensures quality control at every stage, giving installers confidence that the kit will last through demanding use.

Count on MuscleRods for a solid foundation for your LS swap. To explore a more robust kit that offers customizable parts selection 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

MuscleRods B-Body LS Engine Swap Kit for Caprice (1977-1990) and Impala (1977-1985)

Swapping an LS engine into a 1977 to 1990 Caprice or 1977 to 1985 Impala often stalls when stock brackets do not match the original frame geometry. The 1977 to 1990 B Body Caprice LS Conversion Kit delivers custom motor and transmission mounts that bolt directly to these frames with no tunnel modifications. By preserving the factory drivetrain angle, vibration is cut and chassis stress is reduced while retaining support for both 4L60E and 4L80E transmissions. Each bracket and crossmember is made in the USA by MuscleRods to precise dimensions so installers can move forward with confidence.

Precision Drivetrain Alignment for Caprice and Impala Frames

The kit preserves the factory engine and transmission angle on 1977–1990 Caprice and 1977–1985 Impala frames, which is vital for driveline health. By matching the original orientation, universal joints run smoothly and binding under load is prevented, reducing vibration and chassis stress. This alignment also limits torque steer and harsh feedback during acceleration, so drivers experience a more predictable response. Installers avoid the guesswork of custom bracket fabrication, achieving a seamless fit that protects steering and suspension components over the long term.

Polyurethane Transmission Mount for Reduced Vibration

Replacing factory rubber with a polyurethane mount and spacer assembly brings significant gains in durability and noise control. Polyurethane resists oil and fluid attack far better than conventional materials, so it retains its shape and stiffness even after extended use. During hard launches or spirited driving it holds the transmission firmly in place, yet still isolates harshness from the passenger compartment. Over time it exhibits far less sag and deterioration, ensuring consistent performance and reduced maintenance intervals.

Flexible Oil Pan Compatibility for Clearance Adjustment

Engineers designed the crossmember and frame brackets to accept either a tall clearance pan or an LH8 style design without interference. Builders can fine tune underbody space by choosing a high capacity sump for extended track sessions or a shallow system for lowered ride height on the street. This versatility lets you optimize ground clearance in line with suspension and steering geometry, without custom welding or grinding. The result is a tailored balance between oil capacity and undercarriage space that matches your project goals.

US Made Brackets and Crossmember for Reliable Installation

Every plate and bracket is laser cut and precision machined in the USA to strict dimensional standards, delivering a true bolt in installation with no transmission tunnel modifications. The heavy gauge steel components and crossmember work in concert to maintain exact frame geometry, so each swap repeats with the same fit every time. All required fasteners are included in the hardware pack, eliminating trips to the parts store and cutting overall build time. This domestic production approach ensures quality control at every stage, giving installers confidence that the kit will last through demanding use.

Count on MuscleRods for a solid foundation for your LS swap. To explore a more robust kit that offers customizable parts selection 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