SKU: 29245220317

1978-1983 G-Body Crossmember -TH400 with frame extension RCG-400K

Sale price$183.21 Regular price$203.57
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Description

1978-1983 G-Body Crossmember -TH400 with frame extension RCG-400KFits Models: GM RWD G Body; Malibu, Monte Carlo, El Camino, Cutlass, Grand Prix, Regal, Century, LeMans, Caballero, Bonneville Fits Years: 78 83 Fits Transmissions: TH400, 2004R If you are looking for improved performance check out our lighter weight, next generation of this crossmember, RCGNG 400KBLK. We recommend a polyurethane transmission mount. The G Force GMTM is sold separately. G force has developed a frame extension, GF FE100, to duplicate

  • Fits Models: GM RWD G-Body; Malibu, Monte Carlo, El Camino, Cutlass, Grand Prix, Regal, Century, LeMans, Caballero, Bonneville
  • Fits Years: 78-83
  • Fits Transmissions: TH400, 2004R
  • If you are looking for improved performance check out our lighter weight, next generation of this crossmember,  RCGNG-400KBLK.
  • We recommend a polyurethane transmission mount. The G Force  GMTM is sold separately.
  • G force has developed a frame extension, GF-FE100, to duplicate this longer frame on the early generation vehicles. The RCG-400K is pre-packaged with the frame extension.
  • The primary frame change on the 1978-1988 generation of GM G-Body vehicles begins with 1984 models and the implementation of the 2004R transmission which required positioning the crossmember further to the rear of the vehicle. This is evidenced by two sets of frame holes for the crossmember on the driver side of the vehicle.
  • Note: Some 1983 Hurst Olds are known to have the 2004R transmission and thus the longer frame rail which does not require the GF-FE100 frame extension that is included in this Kit.  Some 1984 El Caminos retained the early frames and do require an GF-FE100 frame extension to run this crossmember.

Application:

Year Make Model Submodel
1982-1983 Pontiac Bonneville
1978-1983 GMC Caballero
1978-1981 Buick Century
1978-1981 Oldsmobile Cutlass Calais
1980-1983 Oldsmobile Cutlass Cruiser
1978-1980 Oldsmobile Cutlass Salon
1978-1983 Oldsmobile Cutlass Supreme
1978-1983 Pontiac Grand Prix
1978-1981 Pontiac LeMans
1978-1983 Chevrolet Malibu
1978-1983 Chevrolet Monte Carlo
1978-1983 Buick Regal
Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 29245220317

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Donald I Clarke
Los Angeles, US
★★★★★ 3
Loose fitting neck, not snug.
Size: XX-Large, Color: Dark Blue
I am 6’4” weigh @ 230 lbs and ordered a 2XL. My dress shirt neck size is 17 inches. If you’re happy with a very loose fitting around your neck, then you’ll be ok with this mock turtleneck shirt. I ordered thinking it would be a snug fit around the neck size, not hanging down @ one inch or more in the front.
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Reviewed in the United States on October 30, 2025
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Christian Howell
Grantham, US
★★★★★ 5
Great for warm weather
Size: Large, Color: Dark Grey
Love these!! I was having a tough time (living in phoenix) and wearing a blazer. It is so hot here that you dont want to wear thick button up shirts with collars etc. T shirts are a bit informal. These are a great mix. Lightweight and breathable, but still a little more dressy than a t shirt. Look good with out the jacket as well. Great for church or nice night out.
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Reviewed in the United States on January 29, 2026
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N8
Whiting, US
★★★★★ 1
Fit
Size: XX-Large, Color: Black
These shirts are very soft and comfortable but the mock fits very lose and sloppy
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Reviewed in the United States on March 15, 2026
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Susan K Anderson
Birmingham, US
★★★★★ 5
Men’s mock golf shirt
Color: Lake Green, White, Black, Size: XX-Large
Fit & quality very good.
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Reviewed in the United States on June 4, 2026
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Garfield S
Natrona Heights, US
★★★★★ 5
Nice Fit
Color: Black, White, Light Gray, Size: 3X-Large
I picked this up looking for something simple but clean, and it delivered. The fit is comfortable, the material feels solid, and it looks good without needing much effort. It’s one of those pieces you can throw on and still look put together.
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Reviewed in the United States on March 29, 2026

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