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LS Engine Swaps Can and Do Affect Transmission Alignment

Motorsport enthusiasts are never at a loss for ways to enrich the experience. From simple shine and go additions, to performance improvements, their imagination is the only boundary in the quest to enhance their cars. Their efforts range from an old school power-plant stuffed into a late model chassis, to a modern engine and drivetrain transplanted into a classic iron platform. Whatever the project, the enjoyment of the accomplishment pushes the “motorsport junkie” from one project to the next.

The popularity of the GM LS engine has brought forth a huge demand for LS based performance products, as well as components to aid in swapping the electronically controlled powertrain. One of the most overlooked aspects of an LS engine conversion in an older muscle or classic car is supporting the transmission end of the new powertrain.

Various motor mount adapters for an LS conversion are commonly designed to allow positioning the engine either at the stock bellhousing location, or forward by 1 to 2 inches. Moving the LS engine forward is often required to provide clearance of the cylinder heads and the exhaust headers to the firewall and other chassis components. Combine this with an electronic shift transmission of varying sizes and configuration options, and the transmission mount can no longer be positioned in the original location over the transmission crossmember.

 The G Force LS Motor Mount SetThe G Force Performance adjustable LS motor mount adapter set, GF-LS-MMA, allows the installation of LS platform engines into early model GM vehicles that utilize a standard 3-bolt style motor mount. The mounts are adjustable to position the bellhousing in either the original factory location, 1″ forward, or 2″ forward. Additionally, within each position is 1/2″ of infinite adjustment for greater positioning flexibility.

A great feature that is unique to the G Force Performance adapter is that the 3 locations are geometrically positioned to facilitate retention of proper driveline alignment, regardless of whether you’re using the stock or a forward position. 

G Force Performance transmission crossmembers are, (unless noted), designed for OEM, or stock bellhousing location. For example, if you are bolting a 4L80E transmission behind your Big Block Chevy in your 69 Camaro; the G Force transmission crossmember for that application is based on the bellhousing positioned at the stock location behind the BBC. Variables such as an LS swap that relocate the bellhousing location must then be addressed. This can be done in some vehicles by moving the crossmember the required 1 or 2 inches and drilling new holes.

Another option is the G Force Performance adjustable transmission mount. This mount allows the crossmember to remain in the stock location, with the mount adjustable forward between 1″ and 2- 1/2″ to accommodate the engine and drivetrain moving forward.

The G Force GF-LS-MMA motor mount and adjustable transmission mount are a must when performing an engine swap into a classic car that originally came with a Small Block Chevy! These innovative products will make the engine swap a breeze, since G Force took the guesswork out of the equation. The craftsmanship and innovativeness of both parts are unique to G Force and will not disappoint. 

In the broad scope of an LS conversion swap, these are just a few of the aspects to consider. But a little reflection before you purchase will go a long way towards making your conversion simple and fun. Let your imagination go wild. G Force is here to help you achieve your motorsport dreams. 

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