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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3
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Description
1977-1990 GM B-Body Crossmember 4L80-E and 4L85-E RCB3-4L80Fits GM B Body Models Fits Years: 1977 1990 Fits Transmissions: 4L80E, 4L85E A new transmission mount is recommended. P N: GMTM GFPP For Vehicles with LS Engines Adjustable Mounts GF GMATM GFPP might be needed Finish: Black Powder Coated Mounting Hardware: Included! Applications: Year Make Model Transmission Fitment Notes 1980 1989 Buick Electra Estate Wagon 4L80 E or 4L85 E Station Wagon Models Only! 1977 1989 Buick Estate Wagon 4L80 E or 4L85 E
- Fits GM B-Body Models
- Fits Years: 1977-1990
- Fits Transmissions: 4L80E, 4L85E
- A new transmission mount is recommended. P/N: GMTM-GFPP
- For Vehicles with LS Engines Adjustable Mounts GF-GMATM-GFPP might be needed
- Finish: Black Powder Coated
- Mounting Hardware: Included!
Applications:
| Year | Make | Model | Transmission | Fitment Notes |
| 1980-1989 | Buick | Electra Estate Wagon | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1977-1989 | Buick | Estate Wagon | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1977-1985 | Buick | LeSabre | 4L80-E or 4L85-E | Sedan Models Only! |
| 1980-1990 | Buick | LeSabre Wagon | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1977-1978 | Buick | Riviera | 4L80-E or 4L85-E | Two Door Models Only! |
| 1978-1981 | Chevrolet | Bel Air | 4L80-E or 4L85-E | Sedan Models Only! Canadian Models Only! |
| 1977-1979 | Chevrolet | Bel Air Wagon | 4L80-E or 4L85-E | Station Wagon Models Only! Canadian Models Only! |
| 1977-1990 | Chevrolet | Caprice | 4L80-E or 4L85-E | Sedan Models Only! |
| 1977-1990 | Chevrolet | Caprice Estate | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1977-1985 | Chevrolet | Impala | 4L80-E or 4L85-E | Sedan and Wagon Models Only! |
| 1977-1990 | Oldsmobile | Custom Cruiser | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1977-1985 | Oldsmobile | Delta 88 | 4L80-E or 4L85-E | Sedan Models Only! |
| 1977-1981 | Pontiac | Bonneville | 4L80-E or 4L85-E | Sedan Models Only! |
| 1977-1981 | Pontiac | Bonneville Safari | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1977-1981 | Pontiac | Catalina | 4L80-E or 4L85-E | Sedan Models Only! |
| 1977-1981 | Pontiac | Catalina Safari | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1977-1978 | Pontiac | Grand Safari | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1977-1981 | Pontiac | Laurentian | 4L80-E or 4L85-E | Sedan Models Only! Canadian Models Only! |
| 1977-1981 | Pontiac | Laurentian Safari | 4L80-E or 4L85-E | Station Wagon Models Only! Canadian Models Only! |
| 1977-1981 | Pontiac | Parisienne | 4L80-E or 4L85-E | Sedan Models Only! Canadian Models Only! |
| 1983-1986 | Pontiac | Parisienne | 4L80-E or 4L85-E | Sedan Models Only! |
| 1977-1981 | Pontiac | Parisienne Safari | 4L80-E or 4L85-E | Station Wagon Models Only! Canadian Models Only! |
| 1983-1986 | Pontiac | Parisienne Safari | 4L80-E or 4L85-E | Station Wagon Models Only! |
| 1987-1989 | Pontiac | Safari | 4L80-E or 4L85-E | Station Wagon Models Only! |
Installation Notes:
- For vehicles originally equipped with 3/8″ crossmember bolts, open existing holes on the frame to 1/2″. If you prefer to retain 3/8″ fasteners, upgrade the installation hardware to Grade 8 bolts and hardened flat washers.
- Some minor contact between the floorplan and the crossmember may occur due to body bushing settling and deterioration, or a bowed floor pan. Usually, this is not a problem. A hydraulic floor jack with a wood cushion will correct a bowed floor.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
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
4.4 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Great
Works great, as long as you don’t lean of one edge too much
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Good roller
Sturdy and strong. Rolls smooth. I used it to put down sound deadener in my classic car. Sometimes you think cheap is cheap but this is a good one.
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Reviewed in the United States on April 12, 2026
★★★★★ 5
Great value great quality.
Very good quality made and very good price.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Makes For Quiet Rides
Model: 10 SqFt(0.95 SqM)
Comparable quality and performance to name brand competitor. It sticks on strong, easy to apply, and does make a difference in sound reduction. Turn your hollow shell sounding vehicle panels into solid sounding walls.
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Reviewed in the United States on March 15, 2026
★★★★★ 5
Must for subwoofers. True 2mm spec. High quality.
Model: 36 SqFt(3.4 SqM), Model: 36 SqFt(3.4 SqM)
Let me start of by saying WOW! This made a huge difference in the SQ of my L7S pushing 930w rms. Before I had major rattles in my 2020 Honda Civic SI. Taking the time to do this to my trunk and Lid made me realize just how loud my subwoofer actually is. It literally eliminated the rattles throughout my whole car. I still plan on doing this to my doors and rear deck but once I upgrade the speakers. I still have half of the box just doing the trunk and lid so 1 box of 36sf will be enough for most of the areas that need to get done. You may need a little more overall. This is true 2mm spec. Very sticky and easy to apply. It just take time to finish the work correctly and roll it down. It is not as heavy as I thought it was going to be. The size of the sheets are perfect for what you need to do. The value is on point for the quality. It does not rip very easily but you can cut it to size without any problems. Again, This is a must buy for anyone who is pushing 1000w rms or more.
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Reviewed in the United States on November 29, 2025