Account Login
Gift Cards
Track Order
Help Center

JEGS Frame Extension


made in usa

Product Q&A
View Now
Click image to zoom
Frame Extension
SAVE $5.50
More than 10 available
Frame Extension
  • 1978-1983 GM G-Body
  • 18 in. x 3 in. x 1 in.
  • Black Powdercoat
  • 1/8 (.125) in. Thick Steel
  • Sold Individually
  • Ships
    64718 is rated 4.8 out of 5 by 4.
    Rated 5 out of 5 by from 83 Buick regal Exactly what I needed for my 83 Buick regal with th400 swap
    Date published: 2022-12-30
    Rated 5 out of 5 by from JEGS brand frame extension & crossmember This frame extension is needed for 1978/9 G-body cars, using a TH400 transmission & the JEGS brand transmission crossmember. I bought crossmember first, then tried installing and realized I had to have this. The JEGS brand crossmember & frame extension both bolted in and worked as designed. Very minor floor “denting” was required on driver side floor. overall satisfied with my purchase
    Date published: 2022-03-09
    • y_2023, m_9, d_20, h_3
    • bvseo_bulk, prod_bvrr, vn_bulk_3.0.35
    • cp_1, bvpage1
    • co_hasreviews, tv_2, tr_2
    • loc_en_US, sid_10001_10001_8696783, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs

    81 Malibu turbo 400 so I need 1 or 2 frame extensions ? Thanks 

    Asked by: Card
    Jegs 555-64718 you would only use one if you needed it
    Answered by: langus
    Date published: 2022-10-03

    Is this the frame extension needed for the th400 crossmember to be installed correctly?

    Asked by: Big Bu Brew
    Hello, Yes- if you have 1979-1983 G-Body chassis you will need this. some of the early 84 car also will need this because some of the early 84' s used left over 83 chassis.
    Answered by: BrandonJ
    Date published: 2021-02-18
    • y_2023, m_9, d_21, h_3CST
    • bvseo_bulk, prod_bvqa, vn_bulk_3.0.35
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_2
    • loc_en_US, sid_10001_10001_8696783, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs

    Items You Need

    Related Products

    Thru-Frame Brake Fitting Fits up to 2" Thick Frame Rail Stainless Steel Fits -03AN Brake Lines 1/pkg Includes: 90° 1/8" NPT to 3/8"-24 Inverted Flare Fitting (for 3/16" Brake Line) 9/16" Nut & Washer
    Fitting goes through a hole in the frame and is retained with a stainless steel jamb nut, used with flexible -03an brake hoses & 3/16" hard lines on the frame sideProvides a finished look for your street rod or muscle ...
    Double-hump design allows dual exhaust upgrade for your vehicleCompatible with the following applications: 1978 - 1988 gm g-body vehicles including chevrolet malibu, monte carlo, buick regal and grand national, oldsmobile cutlass, and pontiac grand prix. will not fit olds cutlass ...

    Recently Viewed

    Some parts are not legal for use in California or other states with similar laws / regulations

    Motor Vehicles

    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.


    WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

    Electrical Cords

    WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.