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JEGS Performance Products 640603

Transmission Crossmember TH400

JEGS Performance Products 640603

555-640603

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JEGS Performance Products 640603 Transmission Crossmember TH400 $129.99
Transmission Crossmember
  • TH400
  • 1978-88 Malibu/Regal/Cutlass/Monte Carlo/Grand Prix/GN

  • JEGS Performance Products 640603 Details

    G-Body Crossmembers

    Note: Crossmember is designed for 1978-88 G-Body that was originally equipped with a SB-Chevy. Does not fit Cutlass Supreme models or El Camino. Engine and transmission swaps may require some additional modifications & fitment of components. Hardware is not included.

    Clears Dual Exhaust & Allows Transmission Swaps

    These transmission crossmembers are made from 1-1/2" x 2-1/2" x 0.120" rectangular tubing. The double hump design clears dual exhaust when using exhaust kit 555-30556 and headers 555-30060.

    Features:
  • Tubular Design
  • Clears Dual Exhaust
  • Options for TH350, 700R4 & TH400 Transmission
  • Black Powder Coated

  • Does JEGS Performance Products 640603 fit your vehicle?

    Narrow Results

    1981 OLDSMOBILE CUTLASS

    • Liter: 4.4
    • SubModel: LS
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1978 PONTIAC GRAND PRIX

    • Liter: 4.9
    • SubModel: BASE
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1982-1985 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1982-1983 BUICK REGAL

    • Liter: 5.0
    • SubModel: ESTATE WAGON
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1984 OLDSMOBILE CUTLASS CALAIS

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979-1981 CHEVROLET MALIBU

    • Liter: 4.4
    • SubModel: CLASSIC
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1979 OLDSMOBILE CUTLASS SALON

    • EngineType: ALL
    • SubModel: HURST

    1986-1987 BUICK REGAL

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1979 CHEVROLET MALIBU

    • Liter: 5.7
    • SubModel: SPORT
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981 OLDSMOBILE CUTLASS SUPREME

    • Liter: 4.3
    • SubModel: LS
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1982-1983 PONTIAC GRAND PRIX

    • Liter: 5.7
    • SubModel: LJ
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981 PONTIAC GRAND PRIX

    • Liter: 4.3
    • SubModel: BASE
    • CUI: 265
    • EngineType: V8 ( 4.3 L / 265 )

    1978-1979 PONTIAC GRAND PRIX

    • Liter: 4.9
    • SubModel: SJ
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1980 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: SPORT
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979 CHEVROLET MALIBU

    • Liter: 4.4
    • SubModel: POLICE
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1979 OLDSMOBILE CUTLASS

    • Liter: 5.0
    • SubModel: VISTA CRUISER BROUGHAM
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1982-1984 PONTIAC GRAND PRIX

    • Liter: 5.7
    • SubModel: BROUGHAM
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981 OLDSMOBILE CUTLASS

    • EngineType: ALL
    • SubModel: SUPREME

    1980 CHEVROLET MONTE CARLO

    • Liter: 4.4
    • SubModel: SPORT
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1978-1979 OLDSMOBILE CUTLASS

    • Liter: 4.3
    • SubModel: VISTA CRUISER
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1980-1982 OLDSMOBILE CUTLASS CRUISER

    • Liter: 4.3
    • SubModel: BASE
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1982 OLDSMOBILE CUTLASS SUPREME

    • Liter: 4.4
    • SubModel: BASE
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1982-1983 BUICK REGAL

    • Liter: 5.7
    • SubModel: ESTATE WAGON
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1978-1979 OLDSMOBILE CUTLASS

    • Liter: 5.0
    • SubModel: VISTA CRUISER
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1981 OLDSMOBILE CUTLASS SALON

    • Liter: 4.3
    • SubModel: LS
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1981 OLDSMOBILE CUTLASS

    • Liter: 4.4
    • SubModel: BROUGHAM
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1978-1981 CHEVROLET MONTE CARLO

    • CC: 5031
    • Liter: 5.0
    • SubModel: LANDAU
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1985-1986 OLDSMOBILE CUTLASS

    • EngineType: ALL
    • SubModel: ALL

    1978 CHEVROLET MALIBU

    • EngineType: ALL
    • SubModel: CLASSIC ESTATE

    1979 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: POLICE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1981-1982 PONTIAC GRAND PRIX

    • Liter: 4.4
    • SubModel: BASE
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1987 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.0
    • SubModel: 442
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1980 PONTIAC GRAND PRIX

    • Liter: 4.3
    • SubModel: BASE
    • CUI: 265
    • EngineType: V8 ( 4.3 L / 265 )

    1985 OLDSMOBILE CUTLASS SALON

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981 OLDSMOBILE CUTLASS SUPREME

    • Liter: 4.3
    • SubModel: BROUGHAM
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1979 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.7
    • SubModel: BROUGHAM
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980-1981 OLDSMOBILE CUTLASS SUPREME

    • Liter: 4.3
    • SubModel: BASE
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1979-1981 CHEVROLET MONTE CARLO

    • Liter: 4.4
    • SubModel: LANDAU
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1980 PONTIAC GRAND PRIX

    • EngineType: ALL
    • SubModel: SJ

    1982-1984 PONTIAC GRAND PRIX

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1978-1980 OLDSMOBILE CUTLASS CALAIS

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979-1980 PONTIAC GRAND PRIX

    • Liter: 4.9
    • SubModel: BASE
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1982 OLDSMOBILE CUTLASS SUPREME

    • Liter: 4.4
    • SubModel: BROUGHAM
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1979-1980 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: CLASSIC ESTATE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1978-1980 OLDSMOBILE CUTLASS SALON

    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1984-1987 PONTIAC GRAND PRIX

    • Liter: 5.0
    • SubModel: LE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979-1980 OLDSMOBILE CUTLASS SALON

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1978-1980 BUICK REGAL

    • Liter: 5.0
    • SubModel: LIMITED
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979 CHEVROLET MONTE CARLO

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1978-1979 PONTIAC GRAND PRIX

    • Liter: 4.9
    • SubModel: LJ
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1979-1980 CHEVROLET MALIBU

    • Liter: 4.4
    • SubModel: CLASSIC SPORT
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1980 OLDSMOBILE CUTLASS

    • Liter: 5.7
    • SubModel: LS
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1982 OLDSMOBILE CUTLASS SUPREME

    • Liter: 4.3
    • SubModel: BROUGHAM
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1978-1979 PONTIAC GRAND PRIX

    • Liter: 5.0
    • SubModel: SJ
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: SPORT
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1985 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.7
    • SubModel: LS
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981-1988 CHEVROLET MONTE CARLO

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1984 PONTIAC GRAND PRIX

    • Liter: 5.7
    • SubModel: LE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1985 OLDSMOBILE CUTLASS CALAIS

    • Liter: 5.0
    • SubModel: SUPREME
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1981 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1980-1981 OLDSMOBILE CUTLASS CRUISER

    • Liter: 5.7
    • SubModel: BROUGHAM
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1979 CHEVROLET MALIBU

    • Liter: 5.7
    • Aspiration: N
    • SubModel: CLASSIC LANDAU
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1978-1979 OLDSMOBILE CUTLASS SALON

    • EngineType: ALL
    • SubModel: 442

    1985 OLDSMOBILE CUTLASS CALAIS

    • Liter: 5.7
    • SubModel: SUPREME
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980-1983 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: CLASSIC
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1982 OLDSMOBILE CUTLASS SUPREME

    • Liter: 4.3
    • SubModel: BASE
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1978 CHEVROLET MALIBU

    • Liter: 5.7
    • SubModel: CLASSIC LANDAU
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1978 CHEVROLET MALIBU

    • Liter: 5.7
    • SubModel: CLASSIC
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980 OLDSMOBILE CUTLASS

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1982-1987 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1978 CHEVROLET MONTE CARLO

    • CC: 5031
    • Liter: 5.0
    • SubModel: SPORT
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979 OLDSMOBILE CUTLASS

    • Liter: 4.3
    • SubModel: VISTA CRUISER BROUGHAM
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1988 OLDSMOBILE CUTLASS SUPREME

    • EngineType: ALL
    • SubModel: CLASSIC BROUGHAM

    1983 CHEVROLET MALIBU

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1985 BUICK REGAL

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1979-1980 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: ESTATE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979-1980 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: CLASSIC SPORT
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979 CHEVROLET MALIBU

    • Liter: 4.4
    • SubModel: LANDAU
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1983 CHEVROLET MONTE CARLO

    • Liter: 5.7
    • SubModel: CL
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981-1982 BUICK REGAL

    • Liter: 4.4
    • SubModel: LIMITED
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1981 PONTIAC GRAND PRIX

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980 CHEVROLET MONTE CARLO

    • CC: 5031
    • Liter: 5.0
    • SubModel: SPORT
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979 OLDSMOBILE CUTLASS

    • Liter: 5.7
    • SubModel: VISTA CRUISER BROUGHAM
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1982 OLDSMOBILE CUTLASS CALAIS

    • Liter: 4.4
    • SubModel: BASE
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1981-1983 OLDSMOBILE CUTLASS CRUISER

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1979 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: LANDAU
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1985-1988 CHEVROLET MONTE CARLO

    • Liter: 5.0
    • SubModel: SS
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1982 CHEVROLET MALIBU

    • Liter: 4.4
    • SubModel: CLASSIC
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1978-1979 OLDSMOBILE CUTLASS

    • Liter: 5.7
    • SubModel: VISTA CRUISER
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1978-1979 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: CLASSIC
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1979-1980 CHEVROLET MALIBU

    • Liter: 5.7
    • SubModel: ESTATE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1983 OLDSMOBILE CUTLASS CALAIS

    • Liter: 5.0
    • SubModel: HURST
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1983 OLDSMOBILE CUTLASS SUPREME

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1981 OLDSMOBILE CUTLASS CRUISER

    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1981-1982 BUICK REGAL

    • Liter: 4.4
    • SubModel: BASE
    • CUI: 267
    • EngineType: V8 ( 4.4 L / 267 )

    1985-1986 OLDSMOBILE CUTLASS SALON

    • EngineType: ALL
    • SubModel: 442

    1978-1981 CHEVROLET MALIBU

    • CC: 5031
    • Liter: 5.0
    • SubModel: CLASSIC LANDAU
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1978 PONTIAC GRAND PRIX

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1978 CHEVROLET MONTE CARLO

    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )
    640603 - JEGS Double Hump G-Body Transmission Crossmembers is rated 3.7 out of 5 by 6.
    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 Worked pretty good! Had to modify a bit, I put on a 1980 malibu. Ended up working out pretty good.
    Date published: 2017-08-31
    Rated 2 out of 5 by from Works great Greats product. Bolts right up. I would get the bushings and new bolts
    Date published: 2016-04-17
    Rated 1 out of 5 by from NEEDED MORE PARTS I bought this cross member to change out my blown up th350 with a built th400 the add says direct bolt in..not so much seeing as i needed the extension piece because my car is an 83 no were does it say such things!! Also Jegs does not sell the extension piece! Was not happy made my own extension next time will think twice and do more research!
    Date published: 2017-07-07
    • y_2017, m_11, d_18, h_2
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    Which one works with a 200r4 in a 85 Monte Carlo Ss

    Asked by: Big Love
    This Part Number: 555-640601 - should work with minor modifications for your application.
    Answered by: Rusty B
    Date published: 2017-10-05

    will this work on a 1980 monte carlo with 350 and 350 turbo

    Asked by: monte80
    No
    Answered by: BrandonJ
    Date published: 2017-10-03

    I have an 83 caprice impala that I put a throw in will this crossmember work?

    Asked by: Ow601
    This is not designed to fit the Impala
    Answered by: Rusty B
    Date published: 2017-09-21

    I have a 1986 Monte Carlo CL with a 350 SBC and TH350 trans. I'm replacing the TH350 with a TH400 trans. Will the 640603 crossmember bolt in to the original locations and support the TH400. Thanks, John

    Asked by: JohnG86
    This is correct.
    Answered by: BrandonJ
    Date published: 2017-09-20

    Brandon, thanks for the quick and precise response. Would flat steel frame "adapter plates" make it work? Those would be easy to make. Thanks in advance. Teach

    Asked by: Teach
    With fabrication this could be made to fit your Elcamino
    Answered by: Jegs Tech
    Date published: 2017-09-04

    So, why not the Elkys' ?

    Asked by: Teach
    The frame mount points for the cross member are different.
    Answered by: BrandonJ
    Date published: 2017-09-01

    1984 Buick Regal 2dr w/350 SBC and 200-4R - will this mount work?

    Asked by: Troner
    This will not work for this with a 200-4R transmission
    Answered by: Jegs Tech
    Date published: 2017-08-25

    I have a 1986 cutlass supreme brougham 2 door I have 2 flowmaster going towards back a400 transmission will this crossmember fit it thanks 

    Asked by: Best
    That crossmember will not work with the Cutlass Supreme models or El Camino chassis.
    Answered by: BrandonJ
    Date published: 2017-08-18
    • y_2017, m_11, d_18, h_2CST
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    • clientName_jegs
    Items You Need

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