S550 S650 Mustang 9" IRS Conversion Kit by GForce

GForce 9” conversions use a Strange Engineering aluminum center section paired with the Strange S-Trac differential, which has proven to be a phenomenal combination to retain OEM-like drivability, while being able to support a tremendous amount of torque in a functional differential. Standard use is a 9” 28-spline pinion “street” gear for the vast majority of applications, but 35-spline pinion Pro Gears  are available upon request for customers who are interested in drag-only applications.

We (KellTrac) will only offer CARBON FIBER driveshafts with this kit. If you want to use aluminum then we suggest having someone make that for you. When you select the Carbon DS option it comes with a direct bolt transmission flange, or forged slip yoke for traditional style open-tailshaft transmissions.

All rear ends will be offered with or without upgraded differential bushings. We highly recommend that you ensure your subframe is locked down with either a good design "IRS lockout kit" or solid subframe bushings. The differential and cradle bushings are the two fundamental support pieces we focus on first when looking at rear end stability and they need to be upgraded accordingly as you go up in power. Together, they will not only help prevent wheel hop and control pinion rise, but they will also make the car more consistent and feel more controlled on the road and at the track.

These GForce 9” Kits through KellTrac Include:
• Strange Pro HD center section with your choice of gear ratio
• GForce fabricated rear housing and front mount to adapt the 9” center section to the factory cradle
• Renegade Axles with option to upgrade to Outlaw Axles, EXOTIC ALLOY STUBS STANDARD
• 35 Spline 9” inner stub assembly specific to our fabricated housing
• Outer splined stubs to suite the appropriate OEM spline count for a given application

You can call or email to discuss your plans for the car to make sure you are on the right path with the components you are selecting.

Optional INFO:
Renegade vs. Outlaw Axles

Note: Some vehicles will have very little clearance around the passenger side factory 2 pc driveshaft carrier bearing mount and it may require you to “massage”, cut back, or remove the factory mount entirely, depending on available clearance for driveshaft movement.

Fitment
GForce 9” Kits are designed to fit in the factory location and work with factory components with as little modification as possible. When installing a GForce 9” kit, it is up to the installer to check for clearance around all components, including potential clearance issues from drivetrain and suspension movement. Axle boots can sometimes be close enough to shocks or suspension that they could rub and cause a failure down the road. Most OEM shock mounts can be loosened and allow you to push the shock body away from the axle and gain a little more clearance to avoid any issues.

Modification might be necessary for driveshaft clearance, especially with exhaust, specifically towards the diff, where the pinion height will be at a lower level, compounded by using a larger diameter driveshaft. 9” kits are not guaranteed to fit with ANY other aftermarket products. Aftermarket shocks, control arms, etc. may present clearance issues. If CV boots have clearance issues, low profile boots can be purchased at an upgraded cost. The low profile boots reduce the amount of available axle angle in comparison to the standard boots, so they are not ideal for lowered or high axle angle vehicles. This includes 2010-15 Camaro and all years of Mopar platforms. If you have questions or would like to add low profile boots to your axles, please contact us for more information.

Dedicated race cars may require other considerations for gear and bushing choice; please call with questions.

Damage Prevention
NO DRIVELINE COMPONENT IS BOMBPROOF! GForce does not put a power rating on any driveline components as there are entirely too many variables that can affect a driveline component outside of power. We take great pride in trying to build the strongest driveline components to fit within certain applications, but it is important to know that You, the end customer, are responsible for seeing to proper installation and You, as the driver, are responsible for the lifespan of your axles or other driveline components. 

Service
All driveline components will fatigue or wear over time depending on how the vehicle is driven and what level of performance is demanded from them. CV joints are a wear item and will see wear over time, but with our current design, axles can be sent in for service. So boots, fasteners, and CV assemblies can be serviced without scrapping the complete axle assembly. It is up to each customer to establish their own maintenance intervals based upon the manner in which their car is driven. Individual inner or outer splined stubs and axle bars can be replaced as well if they twist or are damaged due to wheel hop or simply from power levels exceeding capability of the material. Customers can reach out to GForce directly for current repair costs or component replacement as well as return authorizations for service – [email protected]