0
0
Account Login
1-800-345-4545
Gift Cards
Track Order
Help Center

JEGS Transmission Crossmember for GM TH400

555-640603


Product Q&A
View Now
Click image to zoom
JEGS 640603
$127.99
$117.99
SAVE $10.00
More than 10 available
Transmission Crossmember
  • TH400
  • 1978-88 Malibu/Regal/Cutlass/Monte Carlo/Grand Prix/GN
  • Does not fit Cutlass Supreme or El Camino Models
  • Ships
    QTY

    Items You May Also Consider

    Ratings
    Price
    Brand

    Does JEGS 640603 fit your vehicle?

    Narrow Results

    1984 OLDSMOBILE CUTLASS CALAIS

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: N

    1984 CHEVROLET MONTE CARLO

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: J

    1978 PONTIAC GRAND PRIX

    • Liter: 4.9
    • SubModel: SJ
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 301
    • Engine Type: V8 ( 4.9L / 301 )
    • Engine Vin: W

    1984 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: H

    1982 OLDSMOBILE CUTLASS CALAIS

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: R

    1979 CHEVROLET MALIBU

    • Liter: 4.4
    • SubModel: ESTATE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 267
    • Engine Type: V8 ( 4.4L / 267 )
    • Engine Vin: J

    1981 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.7
    • SubModel: LS
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: N

    1980 OLDSMOBILE CUTLASS

    • Liter: 5.7
    • SubModel: BROUGHAM
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: N

    1980 PONTIAC GRAND PRIX

    • Liter: 4.9
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 301
    • Engine Type: V8 ( 4.9L / 301 )
    • Engine Vin: W

    1983 CHEVROLET MALIBU

    • Liter: 5.7
    • SubModel: CLASSIC
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: -

    1980 CHEVROLET MONTE CARLO

    • Liter: 4.4
    • SubModel: LANDAU
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 267
    • Engine Type: V8 ( 4.4L / 267 )
    • Engine Vin: J

    1980 OLDSMOBILE CUTLASS CALAIS

    • Liter: 4.3
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • CUI: 260
    • Engine Type: V8 ( 4.3L / 260 )
    • Engine Vin: F
    640603 is rated 3.5 out of 5 by 16.
    Rated 5 out of 5 by from Fit my 1985 GMC Caballero (El Camino) The description says it does not fit the El Camino but it fit my 1985 GMC Caballero (El Camino perfectly. I am replacing my original transmission with a 2004r and this crossmember fit perfect. No modification needed. My car does have the driver side frame extension. If your does not then this may not work in your car. Less than half the price of competitor's crossmember
    Date published: 2019-12-29
    Rated 5 out of 5 by from Perfect fit My 88 Monte Carlo SS has a rebuilt 200 4r trans bolted to a 70s era 350 HP 350, 305 is in the dumpster. Several custom exhaust shops in my area recommended this crossmember. Bolted right in. Welds look good, time will tell.
    Date published: 2019-07-12
    Rated 5 out of 5 by from Great price and fit!! Installed on my 86 Monte carlo ss to add dual exhaust. Works for the 200r4 trans as well as the turbo 400.
    Date published: 2019-06-20
    Rated 5 out of 5 by from built to fit bought this product last month was going to fab. it but the price was right and super fast shipping
    Date published: 2017-04-11
    Rated 5 out of 5 by from exact fit easy to install, exact fit, no modification needed
    Date published: 2016-11-28
    Rated 5 out of 5 by from Good product. Went right in my grand Prix. Was able to bolt th400 right in place using this cross member. Dual exhaust humps will make the exhaust a breeze.
    Date published: 2015-12-12
    Rated 4 out of 5 by from Good bang for your buck Despite the warnings about not fitting El Caminos I saw examples of people making it work so I figured for the price it was worth a try. It bolted up with no issues. I haven’t dropped the drivetrain in, but at least I can verify that with the appropriate frame expansion it will bolt between the frame rails and doesn’t interfere with the body. It doesn’t look like it has as much space as the competitors for a large exhaust system, but it should be quite a bit better than stock
    Date published: 2019-06-11
    Rated 4 out of 5 by from Product fit well and gives the correct clearance for a true dual exhaust system
    Date published: 2018-01-22
    • y_2021, m_2, d_25, h_17
    • bvseo_bulk, prod_bvrr, vn_bulk_3.0.14
    • cp_1, bvpage1
    • co_hasreviews, tv_1, tr_15
    • loc_en_US, sid_10001_10001_3162320, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs

    I have a 86 t-type regal sbc/turbo 400trans will this crossmenber work.

    Asked by: Ratboy
    Yes, this should work for your application.
    Answered by: Kenny U
    Date published: 2018-11-07

    Will this work with a 1985 cutlass  supreme  I am putting a turbo 400 in it with a big block of not what one can I use?

    Asked by: Nezzkustoms
    No, this will not work with the Cutlass Supreme. You will need to make a universal kit work - https://www.jegs.com/i/Trans-Dapt/969/4549/10002/-1
    Answered by: Rusty B
    Date published: 2018-06-12

    Have a 1978 cutlass Calais I put a 2004r trans and 305 in this week. Will this cross member work

    Asked by: Jason1405
    Yes, this will fit your Oldsmobile Cutlass Calais.
    Answered by: Rusty B
    Date published: 2018-06-08

    Is this the right crossmember for a 1981 malibu with 200-4r transmission?

    Asked by: philbert1310
    Yes, this should work for your application.
    Answered by: Rusty B
    Date published: 2018-06-08

    I have a 86 regal with a 6.0 ls with a 200 4r tranny. But i dont see a listing for a crossmember and that specific tranny. But I Have looked at other products. And noticed that the th400 and 200 4r. Are the same is that true with this crossmember?

    Asked by: Gsxrecon
    This crossmember should work in your application.
    Answered by: Rusty B
    Date published: 2018-05-30

    Do you have one that would fit a el camino

    Asked by: Deon2121
    No, you will need to modify this or use a universal crossmember on your El Camino.
    Answered by: Rusty B
    Date published: 2018-05-24

    You offer a TH350 & TH400 G-Body crossmember, 2 different part numbers. However in both pictures it shows the same trans. mount support bracket. A TH350 mount has a single center bolt hole, a TH400 mount has 2 bolt holes spaced 1 3/4" from center-center?

    Asked by: Oldsmobile83
    The transmission mount has 3 holes and should fit either transmission.
    Answered by: Rusty B
    Date published: 2018-05-15

    I have a 1981 Malibu it had a v6 now will have 5.3 ls that will sit where existing bell housing was.  Will I need an extension for this or will it bolt right in?

    Asked by: ryanu
    The crossmember will bolt in, you way have to adjust for the transmission mount pad depending on the TH400 you use to connect to the LS series engine.
    Answered by: Rusty B
    Date published: 2019-09-30
    • y_2021, m_2, d_25, h_17CST
    • bvseo_bulk, prod_bvqa, vn_bulk_3.0.14
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_17
    • loc_en_US, sid_10001_10001_3162320, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs

    Items You Need

    Easy Kits

    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.

    Tools:

    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.