Trackhawk uses a 32 spline inner stub and 35 spline outer stub

It is important that all dealers understand and explain to customers that this is an exceptionally heavy vehicle, making a lot of torque with a steep 1st gear… These axles have served our customers very well, but it is important to realize that we are asking a lot of a 32 spline inner stub and 31 spline axle bar. These are the strongest components that we can make to work within the OEM specifications, but that does not mean they are bombproof. These vehicles are also very prone to wheel hop, which increases the likelihood of axle or driveline damage. We are planning options for a 9" conversion down the road, but it will be more involved than our standard kits and will take more time to develop. We have numerous customers at 1100hp who haven't hurt anything; We've had customers with numerous runs at 1400 who eventually hurt parts and customers as low as 750 who have hurt parts. Our average customer hovers around 900-950. At this level, it doesn't take much of a mistake to hurt something if you strike the tires wrong. MUST USE aftermarket differential bushings or differential brace to help prevent damage to axles from excess rear end movement. Damage that occurs due to the stub not being seated fully will NOT be covered under warranty.