🚗 Upgrade Your Drive with JEGS!
The JEGS Transmission Double-Hump Crossmember is a high-performance upgrade designed specifically for TH-400 transmissions in most GM G-body applications. With its durable black powder-coated steel construction and innovative double-hump design, this crossmember allows for dual exhaust upgrades while ensuring a perfect fit for vehicles like the Chevrolet Malibu and Monte Carlo. Weighing only 13.1 pounds, it combines strength with lightweight efficiency, making it an essential component for any serious transmission swap.
| Item Depth | 48.0 inches |
| Manufacturer | JEGS |
| UPC | 889944070764 |
| Item Weight | 13.1 pounds |
| Product Dimensions | 48 x 6 x 9 inches |
| Manufacturer Part Number | 640603 |
| OEM Part Number | 640603 |
A**E
Perfect fit
Worked perfect on my oldsmobile with 2004r. Look no further
F**Y
Crossmember
Really nice crossmember definitely recommend
P**E
G body
The media could not be loaded. If you are planning to do a th400 in a 1985 Monte Carlo the bolts holes will need some grinding other wise works perfect.
J**K
fits to My 88 monte carlo ss
now i can put 3" streight pipes on with headers i am very happy
D**I
Too short
The specs say it’s 48 inches in length but when I tried to install it into my 1980 Monte Carlo it was too short. So I double checked what the description said and it says 48 inches I ended up measuring it and it’s roughly 47 inches I hope they have another option and I just bought the wrong part or something
J**N
Fits fine
Fits fine on my 87 Monte Carlo. It does dig into the floor pan a little bit on the driver side. But fits on the frame and my 200r4 transmission just fine
S**K
built very well
bolted right in. only had to do a little bit of tweaking to the exhaust
Trustpilot
3 weeks ago
2 weeks ago